Tsubaki NES Series User manual

EMER-FLEX COUPLING

1
CONTENTS
INDEX
PRODUCT FEATURES
PRODUCT STRUCTURE
PRODUCT APPLICATIONS
PRODUCT SELECTION
MODEL LIST
NEF-HUB
NES Series
NEF Series
Spacer Type
Long Spacer Type
Stocked Long Spacer Type
Short Spacer Type
Single Type
Clamping Method
Power-Lock Method
NEH Series
Other Series
INSTALLATION
BORE SPECIFICATIONS
P. 2
P. 3-4
P. 5-6
P. 7-8
P. 9-10
P. 11
P. 12
P. 13-14
P. 15-16
P. 17-18
P. 19
P. 20
P. 21-22
P. 23-25
P. 26-31
P. 32-33
P. 34-36
P. 37-40
P. 41-45

NES Series
NEF
Spacer Type
Rough or keyed bore
NEF
Long Spacer Type
Rough or keyed bore
NEF
Single Type
Rough or keyed bore
SeeP.13
-
14
SeeP.15
-
16
SeeP.17
-
18
SeeP.21
-
22
NES Series products are small disk couplings
that use extra super duralumin.
Both spacer-type and single-type couplings are
available.
With Spacer Type, two disk sets absorb angular
misalignment, parallel misalignment and axial
displacement.
Long Spacer Type acts as a floating shaft when
the distance between shaft ends is large.
With Single Type, a single disk absorbs angular
misalignment and axial displacement.
SeeP.23
-
25
SeeP.32
-
33
SeeP.34
-
36
NEF
Clamping Method
NEF
Power-Lock Method
NEH Series
Other Series
Refer to the page noted above when using the
clamping method to connect to shafts (friction
coupling by tightening one bolt).
Refer to the page noted above when using the
Power-Lock method to connect to shafts.
NEH Series products are large-size, spacer type
couplings.
Tsubaki can manufacture a coupling to suit most any application, such as our G Type products that are compatible with gear couplings.
2
INDEX
PRODUCT SERIES LIST
SeeP.26
-
31

3
EMER-FLEX COUPLING
Disk (Supports high torsional
stiffness)
Low moment of inertia
(Square hub for Power-Lock)
Strength analysis is used to determine
the optimum shape.
The original TSUBAKI design
eliminates unnecessary flange
portions.
Torsional Stiffness Curve
Torsion Angle (degree)
Torque
6








2



0
NEF10
NEF18
NEF25
In order to make the EMER-FLEX COUPLING the ultimate disk coupling, Tsubaki optimized its design using finite element analysis. This coupling will
meet all of your needs with no lubrication, no backlash, and with improved torsional stiffness for greater precision. This adds up to excellent flexible coupling
performance for reliable torque transmission and absorption of shaft misalignment. Tsubaki offers a full line-up of EMER-FLEX couplings, from the small-
size precision NES Series offering a minimum of 0.7N·m torque transmission to the large size NEH Series delivering up to 176000N·m torque transmission.
Our easy-to-select and convenient wide range of models include the Long Spacer Type, which functions as a floating shaft; the U-Type that enables spacer
mounting and dismounting without disassembling the disk connecting section; the G-Type, which can replace gear couplings and other types that use various
shaft coupling methods (Power-Lock, keyway, clamp, etc.) These EMER-FLEX couplings are ready to meet all of your next-generation coupling needs.

4
EMER-FLEX
PRODUCT FEATURES
1
Finish–Bored Couplings
Single-Type and Spacer-Type
couplings with pre-machined,
standard diameter shaft bores
(new JIS key standard type)
are always in stock and
available for fast deliveries.
6
Long Service Life
With the anti-wear parts,
the Emer-flex Couplings
have an amazingly long
useable life.
11
Floating Shaft Function
Long Spacer Type acts
as a floating shaft,
allowing the transmittance
of power from a drive unit
at some distance, without
the use of bearings.
2
Lubrication Free
With no sliding or moving
parts, there are no friction
faces and lubrication is
unnecessary.
7
Large Disk Bore
The disk bore in EMER-
FLEX couplings can handle
even the largest of shaft
diameters. This enables
various flexible installations
(with shaft mounted in the
disk, etc.).
12
Excellent Environmental Durability
Because the Emerflex is an
all-metal coupling without
lubrication, it can stand up
to high temperatures. The
unit surface is also
specially treated so it can
withstand virtually any
environment.
3
No Backlash
Torque is transmitted by
friction connections, so there
is no backlash and minimum
hysteresis. This makes the
Emerflex suitable for servo
motor and other applications
that need high-precision
power transmissions.
8
Original TSUBAKI Disk Design
Our original disk design
achieves high torsional
stiffness and axial flexibility.
13
Easy Installation
The Power-Lock Type is equipped with an anti-rotation
hole in the pressure flange, so tightening bolts is made
easy, with no shaft rotation. With the U-Type couplings
(Unit Spacer Type), the spacer can be mounted and
dismounted without
disassembling the disk
connecting section.
4
High Torsional Stiffness
With high torsional stiffness,
elastic deformation is greatly
reduced so even slight
rotation movement is
precisely transmitted to
driven side.
9
Axial Flexibility
When the motor shaft
expands due to heat
generated during operation,
the coupling absorbs the
expansion and does not
generate unnecessary thrust
power against bearing.
14
Quick Delivery
In addition to our product
inventory with standard
shaft bore diameters,
Tsubaki can offer
products with other shaft
bore diameters with
short delivery times.
5
Low Moment of Inertia
We have eliminated
unnecessary flange portions,
and offer a unique square
hub, resulting in minimum
moment of inertia. With the
NES Series, the hub and
spacer are made of extra
super duralumin, which
considerably reduces weight.
10
Excellent with Servo Motors
A new production method
makes this coupling strong
and lightweight. With the
addition of the NES Series,
we have couplings that are
suitable for small to large
servo motor.
15
Standardized Power-Lock Types
All Emerflex couplings
come standard with a
Power-Lock. So each
is provided with a
pressure plate and
pressure bolt.

5
PRODUCT STRUCTURE
Hub
Hub
Hub
Washer A
Washer B
Pressure bolt
Pressure
flange
Power-Lock
Reamer bolt
Reamer bolt
Disk
Disk
Disk
Washer A
Washer A Washer B
Washer B
Washer A Washer B
Spacer
Reamer bolt
U-nut
U-nut
U-nut
NEF Series
Power-Lock TypeSingle Type
Spacer Type
NES Series
Hub
Washer
Washer
Washer
Washer
Disk
Hexagon socket
head bolt
Spacer
Hub
NEH Series
Overload
washer
Overload
washer
The disk, bush and collar
are all integrated.
Collar
U-nut
Disk set
Bush
Spacer
Reamer bolt

6
EMER-FLEX
NEF Series Long Spacer Type
Washer A
Washer A
Washer B
Washer B
Spacer
Reamer bolt
U-nut
U-nut
Hub
Disk
Hub
NEH Series Long Spacer Type
Overload
washer
Overload
washer
The disk, bush and collar are all integrated.
Collar
Bush
U-nut
Reamer bolt
Disk set
Spacer

7
PRODUCT APPLICATIONS
NC machining centers
Servo motor
Table
Ball screw
Emer-Flex Coupling
(Power-Lock Type)
Windmills
Speed increaser
Generator
Emer-Flex Coupling
Robots
Emer-Flex Coupling
NES Series
Servo motor
Ball screw
Lifters
Emer-Flex Coupling Emer-Flex Coupling
LINIPOWER Jack
Printing presses
Elevator-type vertical parking lots
Emer-Flex Coupling
Emer-Flex Coupling
Bevel helical reduction gear
Roller chain
Emer-Flex Coupling Gear box
Gear box

8
EMER-FLEX
Example of Mounting
Example of Mounting

99
PRODUCT SELECTION
2. Shaft Diameter
Make sure that the target shaft diameter does not exceed the allowable mounting shaft diameter for the coupling.
With the Power-Lock, check the power lock size, quantity and transmission torque.
With the clamp type, make sure that the correct torque determined in Item (1) does not exceed the allowable transmission torque for the clamp.
3. Maximum Rotation Speed for Long Spacer Types
When using the Long Spacer Type coupling at a high speed rotation, the rotation speed must be checked in order to avoid the resonance point.
When selecting the Long Spacer Type coupling, make sure that the maximum dimension “J”and the rotation speed for each model are not exceeded.
If the operating rotation speed exceeds the specified value, a larger model number must be selected.
If the operating rotation speed is not within the following range, or if the selection of a larger model number is not an option, a “High-Speed Type
Long Spacer”coupling can be manufactured as one solution. (See p. 36)
Service Factor (SF) Table
1. Correct torque calculation
1-1. When connecting to a servo motor or stepping motor
To determine the correct torque, multiply the maximum torque of the servo motor or
stepping motor by the service factor (SF) corresponding to the type of load listed in the
table below.
1-2. When connecting to a general-purpose motor
To determine the correct torque, multiply the load torque calculated with the following
formula by the service factor (SF) corresponding to the type of load listed in the table on
the right.
Service Factor (SF) Table
Type of Load Constant Load
1.2 Service Factor (SF)
Mid-Level Variable Load
1.4
Heavy Variable Load
1.5
Type of Load
Type of Motor
General-Purpose Motor / Gas Turbine
Engine
Low Moment
of Inertia High Moment of Inertia 4-Cylinder 6-Cylinder 8-Cylinder
Constant Load 1.5
-
1.75 1.75
-
2.0 2.5
-
4.0 2.0
-
2.5 1.5
-
2.0
Mid-Level Variable Load
2.0
-
2.5 2.5
-
3.0 4.0
-
5.0 2.5
-
3.5 2.0
-
3.0
Heavy Variable Load
3.0
-
4.5 4.5
-
6.0 4.5
-
5.5 3.0
-
4.0 2.5
-
3.5
Ｔ
＝
60000×P Ｔ
＝
974×P
2π×ｎn
Ｔ
＝ Ｔ×SF
T＝ Load torque N·m {kgf·m}
P＝
Transmission power kW
n＝
Rotation speed r/min
T＝
Correct torque N·m {kgf·m}
 


Long Spacer Maximum Length (Dimension “J”)
3600
NEF 04W
NEF 10W
NEF 18W
NEF 25W
NEF 45W
NEF 80W
NEF130W
NEF210W
NEF340W
NEF540W
NEF700W
NEH 09W
NEH 14W
NEH 20W
NEH 30W
NEH 41W
Unit:
mm
2000 1800 1500 1200 1000 900 750 720 600 500 400 300 200 150
980 1310 1380 1510 1680 1840 1940 2130 2170 2380 2610 2910 3360 4120 4750
1120 1500 1580 1730 1940 2120 2230 2450 2500 2730 2990 3350 3860 4730 5460
1180 1580 1660 1820 2040 2230 2350 2570 2620 2870 3150 3520 4060 4970 5740
1310 1760 1850 2030 2260 2480 2610 2860 2920 3190 3500 3910 4510 5520
1440 1930 2030 2230 2490 2720 2870 3140 3210 3510 3840 4290 4960
1560 2090 2200 2410 2690 2950 3100 3400 3470 3800 4160 4650 5360
1780 2380 2510 2750 3070 3360 3540 3870 3950 4330 4740 5290
1890 2520 2660 2910 3250 3560 3750 4100 4190 4580 5020 5610
2024 2720 2870 3130 3500 3830 4040 4420 4510 4930 5400
2180 2910 3070 3360 3750 4100 4320 4730 4820 5280 5780
2270 3030 3190 3490 3890 4260 4490 4910 5010 5490
2190 2930 3090 3380 3780 4130 4360 4770 4870 5330 5830
2190 2930 3090 3380 3780 4130 4360 4770 4870 5330 5830
2400 3200 3380 3690 4130 4520 4760 5210 5320 5820
2570 3430 3610 3960 4420 4840 5100 5580 5690
2650 3540 3730 4080 4560 4990 5260 5760 5870
Operating Rotation Speed
r/min
Model No.
*If an impact load is expected, determine the correct torque by multiplying the
maximum torque rated for the motor by an impact factor of 1 to 2.5.
*When clamp or power lock method is used, do not allow torque that is larger than
the shaft bore friction transmission torque (see p. 25 and p. 31), including the
starting torque, even for an instant.

10
EMER-FLEX
10
4. Precautions for Connecting a Servo Motor Drive System
Depending on the natural frequency and electric control status of the system as a whole, a ball screw drive system using a servo motor may generate
large vibration or abnormal sound caused by oscillation due to the characteristics of the servo motor. In this case, adjust the torsional stiffness and
moment of inertia of the overall drive system to increase the torsional natural frequency, or adjust the servo gain with the electric control tuning
function of the servo motor.
5. Select the EMER-FLEX Coupling that Meets the above Requirements, 1 through 4, from the
Transmission Capacity Table.
A Spacer Mounted with a Balance weight
Balance weight
Dynamic Balance Adjustment
Normally, because EMER-FLEX couplings provide a well-balanced design, they need no particular balance adjustment. However, when the coupling
is used at a high rotation speed, or when a long spacer is used, balance adjustment may be required.
In this case, inform us of your desired operating rotation speed, JIS balance rating, dimension “J”, or spacer length so that we can perform your
balance adjustment.
For dynamic balance adjustment, we use the following two methods:
1) Drilling the spacer flange end face, and
2) Mounting a balance weight to the spacer pipe periphery. (The spacer with a balance weight is shown below. The balance weight mounting position
and quantity vary depending on operating conditions. Be careful not to interfere with the balance weight during rotation.)
When requesting a balance adjustment, specify either method 1) or 2) above.
Notes for Large Distance between Shaft
Ends
For large distance between shaft ends, Tsubaki offers a Long Spacer
Type that can be used in a floating state without the need for an
intermediate shaft bearing. We recommend this type of coupling if it fits
your application needs.
If the distance between shafts is short and an intermediate shaft is used
in a floating condition, be sure to use the Single-Type coupling.
If an intermediate shaft bearing is being used instead of the Long Spacer
Type coupling for reasons of convenience, fasten the intermediate shaft
with a bearing to prevent the intermediate shaft from floating. In this
case, it is recommended that the Spacer-Type disk coupling be used.
Never use the Spacer-Type coupling under such conditions; it is very
dangerous due to the marked floating tendency of the intermediate
shaft.
Pay special attention to the above when replacing gear couplings or roller chain couplings with disk couplings.
Long Spacer Type
Single Type + Floating intermediate shaft + Single Type
Spacer Type + Fixed intermediate shaft + Spacer Type
Spacer Type + Floating intermediate shaft + Spacer Type

11
Extended-
Dia. Hub
MODEL LIST
Values in parentheses for the NEH09 to NEH41 apply to the A-hub and U-types.
○： Standard
△： Custom-made
△
Type
Model No.
Allowable
Torque
N･m
{k
g
f･m}
Keyway Max.
Bore Diameterφ
Rough
Bore
(Spacer
Type)
Rough
Bore
(Single
Type)
Standard
Length
(Long Spacer
Type)
Long
Spacer
Type
Type of Hub Bore Machining U-Type
Standard
Hub Extended- Dia. Hub
NES07
0.7
{ 0.07 } −−
○ ○
NES15
1.5
{ 0.15 } − −
○ ○
NES20
2
{ 0.2 } − −
○ ○
NES30
3
{ 0.31} − −
○ ○
NES50
5
{ 0.51} − −
○ ○
NES70
7
{ 0.71} − −
○ ○
NES100
10
{1}
− −
○ ○
NES250
25
{ 2.6 } − −
○ ○
NES800
80
{ 8.2 } − −
○ ○
NES1300
130
{13}
○ ○
NEF02
19.6
{2}
20 25
− −
○○ ○ ○ ○ ○ ○
○
NEF04
39.2
{4}23 28
○ △ ○ ○ ○ ○ ○ ○
NEF10
98
{10}32 40
○ ○ ○ △ ○ ○ ○ ○ ○ ○ ○
NEF18
176
{18}35 42
○ ○ ○ △ ○ ○ ○ ○ ○ ○ ○
NEF25
245
{25}42 48
○ ○ ○ △ ○ ○ ○ ○ ○ △ ○
NEF45
441
{45}50 60
○ ○ ○ △ ○ ○ ○ ○ △ ○
NEF80
784
{80}60 70
○ ○ ○ △ ○ ○ ○ ○ △
NEF130
1270
{ 130 } 74 80
○ ○ ○ △ ○ ○ ○ ○ △
NEF210
2060
{ 210 } 83 90
○ ○ ○ △ ○ ○ ○ △ △
NEF340
3330
{ 340 } 95 110
○ ○ ○ △ ○ ○ ○ △
NEF540
5290
{ 540 } 109 120
○ ○ △ ○ ○ ○ △
NEF700
6860
{ 700 } 118 130
○ ○ △ ○ ○ ○ △
NEH09
8820
{ 900 } 111 (158)
○ △ ○ △ △
NEH14
NEH20
NEH30
NEH41
NEH55
NEH70
NEH90
NEH110
NEH135
NEH150
NEH180
13700
{ 1400 }
19600
{ 2000 }
29400
{ 3000 }
40200
{ 4100 }
53900
{ 5500 }
68600
{ 7000 }
88200
{ 9000 }
107800
{ 11000 }
132300
{ 13500 }
147000
{ 15000 }
176400
{ 18000 }
111
133
152
165
187
205
231
254
263
275
289
(158)
(182)
(206)
(224)
−
−
−
−
−
−
−
○
○
○
○
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
○
○
○
○
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
△
G-Type A-Hub
Type
Standard
Hub Long Hub Square Hub Keyway Power- Lock Clamp
Tapered Bore
（φ
11,
φ
16）
△
○
△
△
△
△
△
△
△
△ △
△
△
△
△
△
△
△
△

12
EMER-FLEX
NEF
DIMENSIONS
●Extended-Diameter Hubs
If the target shaft diameter exceeds the maximum shaft bore diameter of the standard hub regardless of there being sufficient leeway in the
transmission capacity, you may select the extended-diameter hub that provides a larger boss diameter (dimension “H”). This way you can avoid
increasing the model size.
●Long Hubs
If the key surface pressure is too high with the standard hub, you may select the long hub that provides a longer dimension “B”, which lowers the key
surface pressure.
●Square Hubs
The square hub is used as a combination with the EL Series Power-Lock Type coupling and the pressure flange set. The pressure bolt tap has been
machined into the hub.
Standard Hub / Long Hub
Max. bore dia.
Max. bore dia.
Max. bore dia.
Extended-Dia. Hub Square Hub
H
DIMENSIONS
NEF02
NEF04
NEF10
NEF18
NEF25
NEF45
NEF80
NEF130
NEF210
NEF340
NEF540
NEF700
Model No.
Standard Hub
Extended-
Dia. Hub Long Hub Square Hub
*
Note 1
Standard Hub
Long Hub Extended- Dia. Hub Square Hub
K Standard Hub / Long Hub Extended-Dia. Hub Square Hub
Rough Bore

d
BH
Max. Bore Dia.
57
67.5
81
93
104
126
143
168
194
214
246
276
20
25.4
25.4
28.7
33.5
41.1
47.8
57.2
63.5
76.2
88.9
101.6
—
40
40
45
50
60
70
85
120
140
140
150
—
—
25.4
28.7
33.5
—
—
—
—
—
—
—
32
34
46
51
61
71
84
106
118
137
156
169
45
50
66
66
78
92
104
129
147
166
191
209
—
—
47
49
60
—
—
—
—
—
—
—
8
8
10
12
15
15
15
25
25
45
50
50
20
23
32
35
42
50
60
74
83
95
109
118
—
—
—
—
—
35
45
65
71
85
—
—
25
28
40
42
48
60
70
80
90
110
120
130
20
22
30
35
42
50
60
75
85
100
110
120
—
—
35
35
42
—
—
—
—
—
—
—
Keyway Power-Lock Keyway Power-Lock Power-Lock
Unit: mm
*Note: Only the standard hub can be used with the NEF02.
Hub for Taper Shaft Bore
For a
φ
16 taper shaft bore, the following four types of hubs are available in stock:
①NEF04 Hub-16T ②NEF04 Hub-L16T ③NEF10 Hub-16T ④NEF10 Hub-L16T
Dimension ÒAÓ
Servo motor shaft
Dimension
ÒDÓ
Dimension ÒAÓ
Dimension ÒDÓ
Servo motor shaft
Servo motor shaft
Taper
Servo motor shaft
NEF Series Hub Dimensions

13
NES30W - N10C X N12C
()
● High torsional stiffness
The high torsional stiffness enables the couplings to provide excellent trackability for
servo motors, making the NES Series perfect for precision control applications.
● Compact & low moment of inertia
NES Series couplings employ extra super duralumin in the hub and the spacer, resulting
in a compact body. With the reduced outer diameter, this type also lowers the moment of
inertia.
●
RoHS compliant
The NES Series offers environmentally conscious designs that comply with the RoHS
Directive.
●
Shipment of fully assembled parts 
NES Series couplings are shipped as a complete assembly (with finished bores), so the
coupling can be directly mounted to your equipment.
Series Size
Spacer Type Type of Hub
N: Standard Hub
Bore Diameter (mm) Clamp
Reference Number System (Example)
D
D
K
JB B
A
Cross-section X-O-Y
X
OY
EE
Model No.
Refer to the ÒStandard bore diameter and the transmission torque
for each bore diameterÓ table (on the next page).
Allowable
Torque
N･m
{k
g f･m}
Torsional Stiffness 
N･m/rad
{k
g f･m/rad}

Weight 
g

GD
2

{kgf･cm
2
}
Moment
of Inertia


k
g ･m
2
Axial
Spring
Constant

N/mm
{k
g f/mm}
Clamp Bore Dia. 
φD mm
Dimensions
mm
Allowable Misalignment
ABEφKJ
Max.
Rotation
speed

r/min
Bore Dia.
Range
Angular
Misalignment 
deg
Whole
Coupling
Disk
Only
Parallel
Misalignment
mm
Axial
Displacement
mm
Standard
Bore Dia.
(Note 5) (Note 1) (Notes 4, 6) (Note 3) (Note 2) (Note 2) (Note 2)
1.4
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
2.0
0.05
0.12
0.15
0.18
0.24
0.24
0.25
0.28
0.34
0.52
±0.24
±0.36
±0.60
±0.80
±0.80
±0.90
±1.1
±1.4
±1.4
±1.8
9
17
32
53
76
97
160
320
510
1200
0.32×10
-6
0.90×10
-6
2.7 ×10
-6
8.0 ×10
-6
14 ×10
-6
21 ×10
-6
47 ×10
-6
140 ×10
-6
320 ×10
-6
1100 ×10
-6
{0.01}
{0.04}
{0.11}
{0.32}
{0.54}
{0.84}
{1.9}
{5.7}
{13}
{45}
210
{21}
420
{43}
1000
{100}
1600
{160}
2100
{210}
4600
{470}
6200
{630}
11000
{1100}
23000
{2300}
46000
{4700}
600
{61}
1300
{130}
2800
{290}
4200
{430}
6500
{660}
9500
{970}
15000
{1500}
22000
{2200}
39000
{4000}
110000
{11000}
87
{8.9}
47
{4.8}
43
{4.4}
24
{2.4}
25
{2.6}
29
{3.0}
33
{3.4}
11
{1.1}
27
{2.8}
33
{3.4}
18.9
26
31.7
35.6
40
45.5
48.1
59
70.9
97.9
7.5
8.9
11
11.8
12.5
15
15.7
20
23.5
31.5
0.85
1.1
1.1
1.5
1.5
1.75
2.6
3
4.7
5.2
16
19
24
31
34
37
44
55
64
82
3.9
8.2
9.7
12
15
15.5
16.7
19
23.9
34.9
NES07W
NES15W
NES20W
NES30W
NES50W
NES70W
NES100W
NES250W
NES800W
NES1300W
0.7
{0.07}
1.5
{0.15}
2.0
{0.20}
3.0
{0.31}
5.0
{0.51}
7.0
{0.71}
10
{1.0}
25
{2.6}
80
{8.2}
130
{13}
18000
18000
18000
18000
18000
18000
15000
10000
10000
10000
4 - 6
4
- 8
5
- 10
6
- 16
6
- 16
8
- 20
8
- 22
10
- 25
14
- 30
20
- 35
*
Indicate the smaller bore diameter first.
Notes 1. The maximum rotation speed does not take dynamic balance into consideration.
2. The weight, moment of inertia and GD2are the values at maximum bore diameter.
3. The allowable misalignment is based on the assumption that other errors are Ò0Ó.
4. Bore diameters other than the standard diameters specified on p. 14 can be manufactured upon request.
5. Depending on the bore diameter, the allowable torque of the coupling may not be satisfied. Refer to the ÒStandard Bore Diameter and Transmission Torque for Each Bore
DiameterÓ table (on the next page).
6. The recommended tolerance of the mounting shaft is rated at Òh7Ó. A shaft diameter of
φ
35 corresponds to a servo motor shaft with a tolerance of (+0.010 to 0).
Small-Size, Precision: NES Series
NES Spacer Type Couplings
TRANSMISSION CAPACITY / DIMENSIONS
NES

14
EMER-FLEX
Cross-section X-O-Y
A
B
E
K
D
X
OY
B
D
Reference Number System (Example)
NES07S
NES15S
NES20S
NES30S
NES50S
NES70S
NES100S
NES250S
NES800S
NES1300S
0.7
{0.07}
1.5
{0.15}
2.0
{0.20}
3.0
{0.31}
5.0
{0.51}
7.0
{0.71}
10
{1.0}
25
{2.6}
80
{8.2}
130
{13}
430
{44}
780
{80}
1800
{180}
3700
{380}
4500
{460}
7400
{760}
10000
{1000}
19000
{1900}
39000
{4000}
77000
{7900}
1200
{120}
2600
{270}
5600
{570}
8400
{860}
13000
{1300}
19000
{1900}
30000
{3000}
44000
{4500}
78000
{8000}
220000
{22000}
170
{17}
93
{9.5}
86
{8.8}
48
{4.9}
51
{5.2}
58
{5.9}
65
{6.6}
21
{2.1}
52
{5.3}
65
{6.6}
18000
18000
18000
18000
18000
18000
15000
10000
10000
10000
15.85
18.9
23.1
25.1
26.5
31.75
34
43
51.7
68.2
7.5
8.9
11
11.8
12.5
15
15.7
20
23.5
31.5
0.85
1.1
1.1
1.5
1.5
1.75
2.6
3
4.7
5.2
16
19
24
31
34
37
44
55
64
82
0.7
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
0.02
±0.12
±0.18
±0.30
±0.40
±0.40
±0.45
±0.55
±0.70
±0.70
±0.90
7
12
23
37
49
66
110
220
350
790
0.26×10
-6
0.63×10
-6
1.9 ×10
-6
5.5 ×10
-6
8.8 ×10
-6
14 ×10
-6
32 ×10
-6
100 ×10
-6
220 ×10
-6
770 ×10
-6
{0.01}
{0.03}
{0.08}
{0.22}
{0.35}
{0.57}
{1.3}
{4.1}
{8.7}
{31}
4 - 6
4
- 8
5
- 10
6
- 16
6
- 16
8
- 20
8
- 22
10
- 25
14
- 30
20
- 35
Model No.
Bore Diameter
4
0.7
1.3
5
0.7
1.5
2
6
0.7
1.5
2
3
5
6.35
1.5
2
3
5
7
1.5
2
3
5
8
1.5
2
3
5
7
10
9
2
3
5
7
10
9.525
2
3
5
7
10
10
2
3
5
7
10
25
11
3
5
7
10
25
12
3
5
7
10
25
14
3
5
7
10
25
80
15
3
5
7
10
25
80
16
3
5
7
10
25
80
17
7
10
25
80
18
7
10
25
80
19
7
10
25
80
20
7
10
25
80
107
22
10
25
80
118
24
25
80
130
25
25
80
130
28
80
130
30
80
130
32
130
35
130
NES07
NES15
NES20
NES30
NES50
NES70
NES100
NES250
NES800
NES1300
(mm)
Standard Bore Diameter and Transmission Torque for Each Bore Diameter
NES30S - N10C X N12C
()
Series
Size
Single Type
Type of Hub
N: Standard Hub
Bore Diameter (mm) Clamp
*
Indicate the smaller bore diameter first.
Indicated as Ò6.3Ó for a
6.35 bore diameter
and Ò9.5Ó for a 9.525
bore diameter.
Model No.
Allowable
Torque
N･m
{k
g f･m}
Torsional Stiffness 
N･m/rad
{k
g f･m/rad}

Weight 
g

GD
2

{kgf･cm
2
}
Moment
of Inertia

k
g ･m
2
Axial
Spring
Constant
N/mm
{k
g f/mm}
Clamp Bore Dia. 
φD mm
Dimensions
mm
Allowable Misalignment
ABEφK
Max.
Rotation
Speed
r/min
Bore Dia.
Range
Angular
Misalignment 
deg
Whole
coupling
Disk
only
Parallel
Misalignment
mm
Axial
Displacement
mm
Standard
Bore Dia.
(Note 5) (Note 1) (Notes 4, 6) (Note 3) (Note 2) (Note 2) (Note 2)
Refer to the ÒStandard bore diameter and the transmission torque
for each bore diameterÓ table below.
Notes 1. The maximum rotation speed does not take dynamic balance into consideration.
2. The weight, moment of inertia and GD2are the values at maximum bore diameter.
3. The allowable misalignment is based on the assumption that other errors are Ò0Ó.
4. Bore diameters other than the standard diameters specified below can be manufactured upon request.
5. Depending on the bore diameter, the allowable torque of the coupling may be limited. Refer to the ÒStandard Bore Diameter and Transmission Torque for Each Bore
DiameterÓ table below.
6. The recommended tolerance of the mounting shaft is rated at Òh7Ó. A shaft diameter of
φ
35 corresponds to a servo motor shaft with a tolerance of (+0.010 to 0).
Unit: N·m
NES Single Type Couplings
NES

15
TRANSMISSION CAPACITY / DIMENSIONS
NEF-W
Standard Hub × Standard Hub NEF□□W-N□□ XN□□
Extended-Dia. Hub × Standard Hub NEF□□W-K□□ XN□□
①Standard hub ②Reamer bolt ③Washer A ④Washer B
⑤Disk ⑥U-nut ⑦Spacer ⑧Set screw
①Standard hub ②Extended-dia. hub ③Reamer bolt ④Washer A
⑤Washer B ⑥Disk ⑦U-nut ⑧Spacer ⑨Set screw
Long Hub × Standard Hub NEF□□W-L□□ XN□□
Extended-Dia. Hub × Extended-Dia. Hub NEF□□W-K□□ XK□□
①Long hub ②Standard hub ③Reamer bolt ④Washer A
⑤Washer B ⑥Disk ⑦U-nut ⑧Spacer ⑨Set screw
①Extended-dia. hub ②Reamer bolt ③Washer A ④Washer B
⑤Disk ⑥U-nut ⑦Spacer ⑧Set screw
Extended-Dia. Hub × Long Hub NEF□□W-K□□ XL□□
Long Hub × Long Hub NEF□□W-L□□ XL□□
①Extended-dia. hub ②Long hub ③Reamer bolt ④Washer A
⑤Washer B ⑥Disk ⑦U-nut ⑧Spacer ⑨Set screw
①Long hub ②Reamer bolt ③Washer A ④Washer B
⑤Disk ⑥U-nut ⑦Spacer ⑧Set screw
1
NEF02W - N□□ X N□□
NEF Series: Spacer Type Couplings
The NEF Series Spacer Type coupling incorporates two sets of
disk kits, enabling absorption of all misalignments.
This type of coupling provides the widest application range.
Note: The spacer shape is different
from that of other sizes. The
standard hub and extended-
diameter hub are in stock.
Contact us for long hubs.

16
EMER-FLEX
NEF-W
Spacer Type
Unit: mm
Notes 1. See p. 12 for extended diameter and long hub dimensions.
With the long hub, the overall length is extended because dimension “B”is lengthened.
2. All stocked models are manufactured with pilot bores.
Models NEF04W through NEF130W have been stocked with shaft bores machined within the above standard stock bore diameter range. (New JIS key, normal type)
3. The maximum rotation speed depends on the transmission capacity of the coupling.
No balance adjustment has been conducted.
4. The weight, moment of inertia and GD
2
are the values at maximum bore diameter (keyway). For the extended-diameter hub and the long hub, add the individual values listed below.
5. Spacer lengths other than the standard length can be manufactured. For details on the Long Spacer Type, see p. 17.
6. The allowable axial displacement is based on the assumption that the angular misalignment is “0”.
7. Check the key surface pressure in accordance with your operating conditions (see p. 18). The hub material is S45C.
Increase in Weight, Moment of Inertia and GD2per
Extended-Diameter Hub / Long Hub
Model No. Extended-Dia. Hub Long Hub
Weight
k
g
Moment of
Inertia
k
g
･m
2
GD
2
{
k
g
f･cm
2
}
Weight
k
g
Moment of
Inertia
k
g
･m
2
GD
2
{
k
g
f･cm
2
}
NEF02W 0.027
0.18×10
-4
{
0.74
}
− − −
NEF04W 0.046
0.34×10
-4
{
1.35
}
0.056 0.12×10
-4
{
0.47
}
NEF10W 0.15
1.3 ×10
-4
{
5.18
}
0.20 0.77×10
-4
{
3.08
}
NEF18W 0.042
1.1 ×10
-4
{
4.19
}
0.14 0.67×10
-4
{
2.69
}
NEF25W 0.13
3.0 ×10
-4
{
11.3
}
0.20 1.3 ×10
-4
{
5.41
}
NEF 45W 0.14
5.8 ×10
-4
{
23.2
}
0.30 2.8 ×10
-4
{
11.2
}
NEF80W 0.16
11 ×10
-4
{
42.6
}
0.47 6.4 ×10
-4
{
25.6
}
NEF130W 0.67
36 ×10
-4
{
144
}
0.99 20 ×10
-4
{
82.1
}
NEF210W 1.09
73 ×10
-4
{
289
}
2.45 64 ×10
-4
{
254
}
NEF340W 0.90
118 ×10
-4
{
473
}
3.85 132 ×10
-4
{
533
}
NEF540W 2.31
273 ×10
-4
{
1089
}
3.91 178 ×10
-4
{
710
}
NEF700W 2.91
431 ×10
-4
{
1724
}
4.41 236 ×10
-4
{
929
}
Model No. Allowable
Torque
N
･
m
{
k
g
f･m
}
Max.
Rotation
Speed
r/min
Rough
Bore
d
Keyway
Standard
Stock Bore
Dia. Range
Keyway Max. Shaft Dia.
φ
Torsional Stiffness
N･m/rad
{
k
g
f･m/rad
}
Axial Spring
Constant
N/mm{
k
g
f/mm}
A 1 A 2 A 3
Long
Hub
Extended-
Dia. Hub
NEF700W 6860 {700} 3100 70 −118 130 29.1 ×10
5
{
29.7 ×10
4
}
294 {30 } 337.2 385.6 434
NEF02W 19.6{ 2} 20000 8 14
-
25 −25 1.00×10
4
{
0.10×10
4
}
34.3{ 3.5} 63 − −
NEF04W 39.2{ 4} 20000 8 11
-
22 23 29 1.18×10
4
{
0.12×10
4
}
20.6{ 2.1} 86.8 101.4 116
NEF10W 98 { 10} 20000 10 12
-
30 32 40 3.92×10
4
{
0.4 ×10
4
}
29.4{ 3 } 89.8 104.4 119
NEF18W 176 { 18} 18000 12 14
-
35 35 42 7.84×10
4
{
0.8 ×10
4
}
63.7{ 6.5} 104.4 120.7 137
NEF25W 245 { 25} 15000 15 18
-
42 42 48 12.7 ×10
4
{
1.3 ×10
4
}
78.4{ 8 } 120 136.5 153
NEF45W 441 { 45} 13000 15 25
-
50 50 60 21.6 ×10
4
{
2.2 ×10
4
}
109 {11.1} 144.2 163.1 182
NEF80W 784 { 80} 12000 15 30
-
60 60 70 39.2 ×10
4
{
4.0 ×10
4
}
153 {15.6} 164.6 186.8 209
NEF130W 1270 {130} 10000 25 35
-
70 74 80 73.5 ×10
4
{
7.5 ×10
4
}
177 {18.1} 192.4 220.2 248
NEF210W 2060 {210} 8000 25 −83 90 11.3 ×10
5
{
11.5 ×10
4
}
225 {23 } 216 272.5 329
NEF340W 3330 {340} 7500 45 −95 110 16.2 ×10
5
{
16.5 ×10
4
}
235 {24 } 249.4 313.2 377
NEF540W 5290 {540} 3400 50 −109 120 21.4 ×10
5
{
21.8 ×10
4
}
274 {28 } 286.8 337.9 389
PCD
44
49.5
63
71
82
96
111
134
153
172
198
218
Standard
Hub
20
23
32
35
42
50
60
74
83
95
109
118
*1: Indicate the smaller bore diameter first.
*2: Indicate the rough bore (symbol “R”) first.
NEF18W - N30J X K40E
Model No.
Type
S: Single Type
W: Spacer Type
Bore Diameter
(Rough bore: R)
Reference Number System (Example)
Type of Hub
N: Standard Hub
K: Extended-dia. Hub
L: Long Hub
B: Square Hub
*
See p. 12.
Shaft Coupling Method
J: Keyway of new JIS
normal type
E: Keyway of old JIS
Type 2
C: Clamp (See p. 23)
P2: Power-Lock (See p. 26)
*
The number indicates the
number of power locks.
T: Taper Shaft Bore (See p. 45)
Model No.
B B L K D D N No Ni T T
'
Allowable Misalignment
Weight
k g
Moment of Inertia
k g m
2
GD
2
{
k g fcm
2
}
Axial
Displace-
ment
(Note)
NEF700W
101.6 150 276 120 146 164 146 40 -8.4 2 8.0 60
5972 10
-4
{23889 }
NEF02W
20 57 21 24 24 11 2 1.6 0.45
1.66 10
-4 {
6.64
}
NEF04W
25.4 40 67.5 29 25 33 25 15.5 0.9 2 1.6 1.1
5.3 10
-4
{ 21.4 }
NEF10W
25.4 40 81 37 37 46 37 16 1.4 2 2.0 1.4
12 10
-4
{ 47 }
NEF18W
28.7 45 93 39 38 48 38 23 6.7 2 2.4 2.3
25 10
-4
{ 100 }
NEF25W
33.5 50 104 45 47 58 47 21 4.5 2 2.8 3.0
41 10
-4
{ 166 }
NEF45W
41.1 60 126 51 58 69 58 23 4.1 2 3.2 6.6
110 10
-4
{ 440 }
NEF80W
47.8 70 143 61 71 81 71 29.5 7.3 2 3.6 10.3
200 10
-4
{ 800 }
NEF130W
57.2 85 168 73 92 102 92 20 -7.8 2 5.0 16.1
447 10
-4
{ 1787 }
NEF210W
63.5 120 194 84 103 114 103 32.5 -24 2 5.4 23.2
931 10
-4
{ 3722 }
NEF340W
76.2 140 214 97 118 132 118 19.5 -44.3 2 6.6 40.2
1478 10
-4
{ 5912 }
NEF540W
88.9 140 246 110 135 151 135 24.5 -15.6 2 7.6 55
3014 10
-4
{12055 }
E F H H L J
4.9 5.5 32 45 23
6.1 7.5 34 50 36
6.6 7.5 46 66 39
8.3 9 51 66 47
11.2 9 61 78 53
11.7 11.5 71 92 62
11.7 14 84 104 69
16.8 14 106 129 78
17.0 16.5 118 147 89
21.6 16.5 137 166 97
23.9 19 156 191 109
27.2 25.5 169 209 134
mm
Parallel
Misalignment
de g
Angular
Misalignment
1.8
0.3
0.5
0.55
0.6
0.7
0.8
0.9
1.0
1.2
1.3
1.4

17
TRANSMISSION CAPACITY / DIMENSIONS
NEF-W
Long Spacer Type
The NEF Series Long Spacer Type of coupling enables the use of a floating shaft when there is some distance between devices. Depending on the
spacer length, the Long Spacer Type of coupling can also absorb a large amount of eccentricity. This coupling is suitable for line shaft drives to miter
gearboxes.
Formula for Torsional Stiffness
Calculation of Vertical Long Spacer Type
Use the following formula to calculate the torsional
stiffness of vertical Long Spacer Type coupling.
Approx. Weight of Long Spacer Type Coupling / Moment of
Inertia and GD2Calculation Formulae
Torsional Stiffness Calculation for Vertical Long Spacer Type
If dimension “J”for each coupling size exceeds the value listed in the following table when a
Long Spacer Type is installed vertically, a thrust supporter is required as shown on the right.
T×104
（J−J 1 ）・K 1 ＋K 2
N・m/rad
{k
g f・m/rad}
Unit:
J
:The dimension “J”given in the external drawing (distance between
hub end faces) in
mm
.
T
: The allowable torque given in the transmission capacity table
in
N･m{k
g
f･m}
Substitute the constants given in the above table for J1,
K1
and
K2
.
Use the following formula to calculate the
weight of the Long Spacer Type (at
maximum bore diameter).
Unit: k
g
Weight＝W1（J−J1）＋W2
J
:Dimension “J”(distance between hub end faces) in
mm
.
Substitute the constants given in the above table for
J1
,
W1
,
W2
,
d1
,
d2
,
G1
and
G2
.
Use the following formulae to calculate the
moment of inertia and GD2(at maximum
bore diameter).
GD2＝W1×d1（J−J1）＋G1
Unit: k
g
f・cm2
Moment of inertia＝W1×d2（J−J1）＋G2
Unit: k
g
・cm2
* This formula applies to cases where dimension “J”exceeds “J1”(Unit: cm).
N3 N2 N1
Model No.
J 1 K 1 K 2
NEF04W 63 0.0489 32.0
NEF10W 64 0.0472 22.2
NEF18W 74 0.0617 22.5
NEF25W 89.4 0.0475 19.2
NEF45W 105.6 0.0435 20.0
NEF80W 119 0.0501 20.0
NEF130W 148 0.0302 17.3
NEF210W 161 0.0333 18.3
NEF340W 195.6 0.0317 20.6
NEF540W 225.6 0.0276 49.5
NEF700W 257.6 0.0286 47.1
NEH09W 258 0.0360 17.0
NEH14W 292 0.0560 16.3
NEH20W 330 0.0374 15.4
NEH30W 373 0.0374 14.3
NEH41W 390 0.0354 15.8
Weight Moment of Inertia, GD
2
Model No.
W 1 W 2 J 1 G 1 d 1
G2
d 2
NEF04W 0.04 1.3 6.3 16 8.7
4
2.17
NEF10W 0.05 2.0 6.4 48 16.3
12
4.063
NEF18W 0.06 3.1 7.4 100 18.9
25
4.72
NEF25W 0.08 4.4 8.9 171 26.4
43
6.59
NEF45W 0.10 8.0 10.6 446 41.3
112
10.33
NEF80W 0.11 13.6 11.9 872 55.1
218
13.78
NEF130W 0.18 22.7 14.8 2137 88.3
534
22.06
NEF340W 0.25 52.7 19.6 6722 161.7
1681
40.42
NEF540W 0.36 68.8 22.6 14363 208.4
3591
52.09
NEF700W 0.38 78.4 25.8 26687 241.9
6672
60.47
NEH09W 0.44 64.8 25.8 22086 217.5
5522
54.38
NEH14W 0.44 72.4 29.2 24107 217.5
6027
54.38
NEH20W 0.65 109 33 47625 311.0
11906
77.74
NEH30W 0.75 150 37.3 82770 407.5
461.2
20693
101.87
NEH41W 0.95 201 39 125437
31359
115.3
NEF210W 0.21 31.6 16.1 4066 113.6
1017
28.41
Unit: mm
Model No.
NEH14W 1767
NEH20W 1277
NEH30W 1747
NEH41W 1355
Model No. Model No. Dimension “J”Dimension “J”
NEF04W NEF130W 1910
NEF10W NEF210W 1924
NEF18W NEF340W 2143
NEF25W NEF540W 1542
NEF45W NEF700W 1463
NEF80W NEH09W 1153
Dimension “J”
319
408
1171
1429
1386
1505
Vertical Long Spacer Type
Thrust supporter
461.2

18
EMER-FLEX
NEF-W
Notes 1. All sizes are custom-made.
2. When placing an order, specify dimension “J”. Consult with us if your required dimension is 6000 mm or greater.
3. When the Long Spacer Type is used at a high rotation speed, or if dimension “J”is extremely long, balance adjustment or a critical speed check may be required. See p. 9.
4. Contact us to vertically install a Long Spacer Type coupling.
5. The NEF10W, 18W and 25W Power-Lock Type couplings use the square hub for power lock. (See p. 12)
6. Refer to the following description and check the key surface pressure in accordance with your operating conditions. The hub material is S45C.
Installation (Example) Reference Number System (Example)
Roller table
Roller Roller
Pillow block
EMER-FLEX coupling
EMER-FLEX coupling
Miter gearbox Miter
gearbox
Unit: mm
Model No. Type
(Number
of Bolts)
Allowable Torque
N･m{k
g
f･m}
Rough
Bore
d
Max.
Bore Dia.
(Keyway)
B D D E H N 3 A J
Allowable Misalignment
Angular
Misalignment
θ（
de
g）
Axial
Displacement
Parallel
Misalignment
ε
NEF 04W 439.2{ 4} 8 23 25.4 29 6.1 34 32
2B＋J
2 ±1.6
NEF 10W 4 98 { 10} 10 32 25.4 37 6.6 46 42 2 ±2.0
NEF 18W 4 176 { 18} 12 35 28.7 39 8.3 51 46 2 ±2.4
NEF 25W 4 245 { 25} 15 42 33.5 45 11.2 61 56 2 ±2.8
NEF 45W 4 441 { 45} 15 50 41.1 51 11.7 71 68 2 ±3.2
NEF 80W 4 784 { 80} 15 60 47.8 61 11.7 84 80 2 ±3.6
NEF130W 4 1270 { 130} 25 74 57.2 73 16.8 106 102 2 ±5.0
NEF210W 4 2060 { 210} 25 83 63.5 84 17 118 115 2 ±5.4
NEF340W 4 3330 { 340} 45 95 76.2 97 21.6 137 132 2 ±6.6
NEF540W 4 5290 { 540} 50 109 88.9 110 23.9 156 154 2 ±7.6
NEF700W 46860 { 700} 70 118 101.6 120 27.2 169 165.2 2 ±8.0
NEH 09W 6 8820 { 900} 70 111 110 144 19 161 159 1.4 ±3.2
NEH 14W 8 13700 { 1400} 70 111 127 155 19 161 159 1 ±2.1
NEH 20W 8 19600 { 2000} 75 133 146 178 19 193 190.7 1 ±2.4
NEH 30W 8 29400 { 3000} 75 152 165 201 21.5 218 216.3 1 ±2.8
NEH 41W 840200 { 4100} 120 165 171 218 24 240 232 1 ±2.8
NEH 55W 8 53900 { 5500} 130 187 225 252 29.5 272 267.4 1 ±3.6
NEH 70W 8 68600 { 7000} 150 205 247 275 31.3 297 280 1 ±3.8
NEH 90W 888200 { 9000} 150 231 278 304 32.0 334 323.9 1 ±4.3
NEH110W 8 107800 {11000} 190 254 305 343 32.5 364 355.6 1 ±4.8
NEH135W 8 132300 {13500} 190 263 317 350 34.0 382 381 1 ±5.0
NEH150W 8 147000 {15000} 210 275 331 368 34.5 399 381 1 ±5.6
NEH180W 8176400 {18000} 210 289 347 380 35.5 419 406.4 1 ±5.7
K N 2
67.5 27
81 36
93 40
104 50
126 60
143 70
168 92
194 103
214 120
246 134
276 145.2
276 135
276 135
308 160.7
346 186.3
375 196
445 227.4
470 230
511 273.9
556 305.6
587 331
629 331
654 344.6
N 1
17
26
30
38
48
61
76
90
110
125
136
127
127
150
175
187
207
209
247
277
304
304
319
(
J−E
)
×sinθ
Required length (
Max 6000
)
Required length
(
Max 4000
)
*1: Indicate the smaller bore diameter first.
*2: Indicate the rough bore (symbol “R”) first.
*[Reference] Key Surface Pressure Calculation
P＝19600×T（N/mm2）
D×t×B
(T = Operating torque (N·m), D = Bore diameter (mm), t = Key height (mm), B = Effective key length (mm))
D
B
t
NEF25W - N35JV X N40E - J1000
Model No.
Spacer Type
Bore Diameter
(Rough bore: R)
Dimension ÒJÓ
Type of Hub
N: Standard Hub
K: Extended-Dia. Hub
L: Long Hub
B: Square Hub
*
See p. 12.
Indicates the
lower-side bore
diameter of the
vertical Long
Spacer Type
coupling.
Shaft Coupling Method
J: Keyway of new JIS normal type
E: Keyway of old JIS Type 2
C: Clamp (See p. 23)
P2: Power-Lock (See p. 26)
T: Taper Shaft Bore (See p. 45)
J: Long Spacer
JS: Long Spacer (standard
length) (See p. 19)
JT: Single Plate Spacer
(See p. 20)

19
TRANSMISSION CAPACITY / DIMENSIONS
NEF-W
Long Spacer Type (standard lengths)
We maintain a stock of NEF Series Long Spacer Type couplings at ISO standard lengths available for a quick delivery. The spacer offers a well-
balanced design with reduced thickness, suitable for back pullout type pumps, fans and compressors. This type of coupling can also be combined
with the extended-diameter hub, long hub, and clamp types.
Long Spacer Type (standard length) Long Spacer Types in Stock
Note) Refer to the dimension table for dimension “J”.
Dimension “J”indicates the distance between hub end faces.
Actual spacer length = J –2E
N
F
No
Do
PCD
Model No. Spacer Length, Dimension “J”
(mm)
100 127 140 180 200 250
NEF10W-
JS□□□ ○ ○
NEF18W-
JS□□□ ○ ○
NEF25W-
JS□□□ ○ ○ ○
NEF45W-
JS□□□ ○ ○ ○ ○ ○ ○
NEF80W-
JS□□□ ○ ○ ○ ○ ○
NEF130W-
JS□□□ ○ ○ ○ ○ ○
NEF210W-
JS□□□ ○ ○ ○
NEF340W-
JS□□□ ○ ○
Unit: mm
Reference Number System (Example)
*1: Indicate the smaller bore diameter first.
*2: Indicate the rough bore (symbol “R”) first.
NEF25W - N35J X N40E - JS140
Model No.
Spacer Type
Bore Diameter
(Rough bore: R)
Dimension ÒJÓ
Type of Hub
N: Standard Hub
K: Extended-Dia. Hub
L: Long Hub
B: Square Hub
*
See p. 12.
Shaft coupling method
J: Keyway of new JIS normal type
E: Keyway of old JIS Type 2
C: Clamp (See p. 23)
P2: Power-Lock (See p. 26)
T: Taper Shaft Bore (See p. 45)
JS: Long Spacer Type
(standard length)
Model No. Allowable
Torque
N ·m{k g f ·m}
Rough
Bore
d
Max.
Bore Dia.
(Keyway)
B D D E H K A F N No T PCD
Weight
k g
Moment
of Inertia
k g cm
2
GD
2
{
k
f g cm
2
}
Allowable Misalignment
Angular
Misalignment
θ(de g )
Parallel
Misalignment
ε
NEF 25W
JS127
245{ 25} 15 42 33.5 45 11.2 61 104 194 9 47 58 21 82 3.5 43.8 { 175} 22.02
NEF340W
JS200
3330{340} 45 95 76.2 97 21.6 137 214 352.4 16.5 118 132 19.5 172 42.4 1444 {5776}
23.11
NEF 10W
JS100
98{ 10} 10 32 25.4 37 6.6 46 81 150.8 7.5 37 46 16 63 1.7 12.8 { 51}
21.63
JS140
190.8 1.9 13.5 { 54} 22.32
NEF 18W
JS100
176{ 18} 12 35 28.7 39 8.3 51 93 157.4 9 38 48 23 71 2.6 25.8 { 103}
21.60
JS140
197.4 2.8 26.8 { 107} 22.30
JS100
167 3.3 42.3 { 169} 21.55
JS140
207 3.6 44.3 { 177} 22.25
NEF 45W
JS100
441{ 45} 15 50 41.1 51 11.7 71 126
182.2
11.5 58 69 23 96
6.9 97.5 { 390} 21.54
JS127
209.2 7.2 100 { 400} 22.01
JS140
222.2 7.3 101 { 404} 22.24
JS180
262.2 7.6 104.5 { 418} 22.94
JS200
282.2 7.8 106.3 { 425} 23.28
JS250
332.2 8.2 110.8 { 443} 24.16
NEF 80W
JS127
784{ 80} 15 60 47.8 61 11.7 84 143
222.6
14 71 81 29.5 111
10.8 201.8 { 807} 22.01
JS140
235.6 11 203.5 { 814} 22.24
JS180
275.6 11.3 208.8 { 835} 22.94
JS200
295.6 11.5 211.5 { 846} 23.28
JS250
345.6 12 218.3 { 873} 24.16
NEF130W
JS127
1270{130} 25 74 57.2 73 16.8 106 168
241.4
14 92 102 20 134
16.7 420.8 {1683} 21.92
JS140
254.4 16.8 424.5 {1698} 22.15
JS180
294.4 17.3 435.8 {1743} 22.85
JS200
314.4 17.6 441.5 {1766} 23.20
JS250
364.4 18.2 455.5 {1822} 24.07
NEF210W
JS140
2060{210} 25 83 63.5 84 17 118 194
267
16.5 103 114 32.5 153
24 851.5 {3406} 22.15
JS180
307 24.5 868.8 {3475} 22.84
JS200
327 24.8 877.5 {3510} 23.19
JS180
332.4 42 1427.3 {5709} 22.76
Axial
Displacement
±2.0
±2.4
±2.8
±3.2
±3.6
±5.0
±5.4
±6.6