Hitachi WR 16SA S Manual

TECHNICAL DATA
AND
SERVICE MANUAL
IMPACT WRENCH
WR 16SA
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. E705 Feb. 2005
W
MODEL
WR 16SA
Hitachi 
Power Tools

REMARK:
Throughout this TECHNICAL DATA AND SERVICE MANUAL, symbols are
used in the place of company names and model names of our competitors.
The symbols utilized here are as follows:
Symbol Utilized
Competitor
Company Name Model Name
CMAKITA TW0350
BBOSCH GDS18E
PDEWALT DW290

Page
CONTENTS
1. PRODUCT NAME ............................................................................................................................ 1
2. MARKETING OBJECTIVE .............................................................................................................. 1
3. APPLICATIONS ............................................................................................................................... 1
4. SELLING POINTS ........................................................................................................................... 1
4-1. Selling Point Descriptions ................................................................................................................ 2
5. SPECIFICATIONS ........................................................................................................................... 4
5-1. Specifications ....................................................................................................................................4
5-2. Optional Accessories ........................................................................................................................5
6. COMPARISONS WITH SIMILAR PRODUCTS ............................................................................... 7
6-1. Specification Comparisons ...............................................................................................................7
6-2. Tightening Torque .............................................................................................................................8
6-3. Appropriate Tightening Torque for Bolts ............................................................................................9
6-4. Tightening Torque Characteristics when Using An Extension Cord ................................................10
7. PRECAUTIONS IN SALES PROMOTION .................................................................................... 10
7-1. Safety Instructions ..........................................................................................................................10
7-2. Tightening Torque Inspection Prior to Operation ............................................................................11
7-3. Tightening Torque Variation ............................................................................................................ 11
7-4. Temperature Rise ...........................................................................................................................12
8. OTHER PRECAUTIONS ............................................................................................................... 13
9. REPAIR GUIDE ............................................................................................................................. 14
9-1. Disassembly ...................................................................................................................................14
9-2. Reassembly ....................................................................................................................................16
9-3. Insulation Tests ...............................................................................................................................18
9-4. No-load Current Value ....................................................................................................................18
10. STANDARD REPAIR TIME (UNIT) SCHEDULES ...................................................................... 19
Assembly Diagram for WR 16SA

--- 1 ---
1. PRODUCT NAME
Hitachi Impact Wrench, Model WR 16SA
2. MARKETING OBJECTIVE
Twenty years have passed since the sales start of the conventional Model WH 16 and the demand has been
reduced. The new impact wrench Model WR 16SA is the upgraded version of the Model WH 16, featuring the
class-top tightening torque by the computer-analyzed optimum impacting operation, compact and lightweight
body, and durability. The Model WR 16SA is powerful and novel thanks to the 3-D CAD engineering as well as
the double-layer molding, improved handle grip and large bumper to plainly differentiate it from the competitors.
Please expand our market share with this Model WR 16SA.
3. APPLICATIONS
Tightening/loosening of bolts, nuts, etc.
[Applicable markets]
Wooden construction industry: Tightening of bolts etc.
Construction industry: Assembly of scaffolding, tightening/loosening of formwork bolts
Manufacturing industry: Tightening/loosening of bolts for automobiles, rolling stock, shipbuilding, agricultural
machinery and tools, construction machinery, etc.
Utility industry: Assembly and installation of electric equipment, plumbing facilities, air conditioning (duct
assembly etc.), sanitary fixtures and various other facilities
4. SELLING POINTS
Slip-resistant and comfortable
soft grip handle
Compact and lightweight
Class-top tightening torque
Stronger screw connection
thanks to the cylindrical housing
containing an insert screw
Housing is covered with
elastomer entirely.
Powerful motor
Large bumper
protects the outside.
Higher durability thanks to
the metallic bearing bushing
Convenient tumbler switch
Grip end is shaped like a finger
stopper for portability.

--- 2 ---
4-1. Selling Point Descriptions
(1) Class-top tightening torque
With the powerful motor and the computer analysis, the Model WR 16SA gives optimum impact at
tightening screws and the tightening torque is the highest level in this class.
(2) Stronger screw connection thanks to the cylindrical housing containing an insert screw
While the conventional Model WH 16 has the resin housing directly secured with screws, the Model
WR 16SA has the housing containing a brass insert screw for secure screw connection with the
aluminum hammer case (the screw tightening torque is 2 times greater than the Model WH 16). Thus
the Model WR 16SA has higher durability.
Hammer case
(aluminum)
Screw (M5 bolt)
WR 16SA
WH 16
Screw (M5 bolt)
Housing (resin)
Insert screw (brass)
Inner cover
(aluminum)
Hammer case
(aluminum)
Inner cover
(aluminum) Housing (resin)

--- 3 ---
(3) Higher durability thanks to the metallic bearing bushing
A metallic bearing bushing is built in and the outside is covered with resin tail cover for higher durability. The
resin tail cover secures the bearing bushing and also prevents the CB cap from loosening.
Bearing bushing (metal)
(4) Slip-resistant and comfortable soft grip handle
The grip of the Model WR 16SA is soft, slip-resistant and comfortable thanks to the soft material (elastomer
resin) covered on the handle. The Model WR 16SA gives minimum fatigue to the operator's hand even if it is
operated for a long time.
(5) Housing is covered with elastomer entirely
The Model WR 16SA gives no scratch on the floor etc. where it is placed because the housing is covered with
elastomer entirely. In addition, the elastomer-covered housing prevents the Model WR 16SA from slipping on
a slanted surface such as a roof.
(6) Large bumper protects the outside
Prevention of damaging workpieces and being stained
The Model WR 16SA minimizes damaging workpieces even if it contacts the workpiece.
The hammer case is not hot when touched during continuous operation.
The hammer case is covered with a large bumper. Because the bumper is resistant to transmitting heat, the
bumper is not hot even if held by hand during operation.
(7) Grip end is shaped like a finger stopper for portability
The grip end is thickened to make it as a finger stopper for portability.
CB cap Tail cover (resin)

--- 4 ---
5. SPECIFICATIONS
5-1. Specifications
Model WR 16SA
Capacity
Item
Ordinary bolt M12 (15/32") --- M22 (7/8")
High-strength bolt M12 (15/32") --- M16 (5/8")
Tightening torque 360 N•m 3,670 kgf •cm (3,180 in-lbs.)
Tip condition 12.7 mm (1/2") (Width across flat of the socket mounting portion)
Type of motor Single phase AC commutator motor
Enclosure Polycarbonate resin + Elastomer ...................................................... Housing
Polycarbonate resin .......................................................................... Handle cover
Polyamide resin ................................................................................ Tail cover
Aluminum die casting ........................................................................ Hammer case
Rubber .............................................................................................. Bumper
Type of switch
Tumbler switch with forward/reverse changeover pushing button
Power consumption 480 W, 450 W (220 V)
Full-load current 4.6 A (110 V), 4.2 A (120 V), 2.2 A (220 V), 2.2 A (230 V), 2.1 A (240 V)
Impact rate 2,100/min
Main body 2.8 kg (6.2 lbs.) (Excludes cord, socket and side handle)
Packaged 4.8 kg (10.6 lbs.)
Overall length x height 258 mm x 225 mm (10-5/32" x 8-55/64")
Center height 38 mm (1-1/2")
Package
Cord
Side handle (Excludes U.S.A. and Canada)
Plastic case (For certain areas)
Standard accessory
Weight
Handle configuration T-type
No-load rotation speed 1,900/min
Type
Nominal cross-
sectional area
Outside diameter
Length
Corrugated fiberboard box
Plastic case (For certain areas)
2-core cabtire cable
0.75 mm2
7.4 mm
2.5 m
Power source Single phase AC 50/60 Hz
Insulation method Double insulation

--- 5 ---
955138
955139
955140
955141
955149
955142
955150
955143
955151
991480
955144
955146
955147
985197
M 8
M 10
M 10
M 12
M 12
M 14
M 16
M 20
M 8
M 10
M 12
M 12
M 14
M 14
M 16
M 18
M 22
12
13
14
17
17
19
19
21
21
21
22
24
27
30
W 5/16"
W 3/8"
W 3/8"
W 7/16"
W 7/16"
W 1/2"
W 1/2"
W 1/2"
W 5/8"
L1
20
20
20
24
24
24
24
24
24
24
24
25
25
25
14
17
19
21
22
23
24
26
27
30
L1
9
8
9
10
14
15
15
15
16
16
40
32
34
36
40
40
40
40
40
50
14 mm
17 mm
19 mm
21 mm
22 mm
23 mm
24 mm
26 mm
27 mm
30 mm
B
C
C
D
D
D
D
D
D
D
W 3/8"
W 7/16"
W 1/2"
W 9/16"
W 5/8"
M 12
M 16
873540
873536
873624
873626
873627
873628
873629
873630
985195
985196
Hexagon socket
12.7 mm
(1/2")
Square
drive
dimension
Sq (mm)
Part
name
Code
No.
Nominal diameter of applicable bolts Dihedral
width
H (mm)
Shape
Socket primary
dimensions (mm)
M 10
M 12
M 14
M 16
M 18
M 20
M 10
M 12
M 14
M 16
M 18
M 20
M 22
L
ISO
(Ordinary)
ISO
(Small type)
Inch
screw
High-tension
Shape B Shape C Shape D
5-2. Optional Accessories
(1) Each dimension and applicable bolt for each hexagon socket
(2) Each dimension and applicable bolt for each long hexagon socket
Shape B Shape C Shape D
sq
52
52
52
52
75
52
75
52
75
125
52
52
75
75
12 mm
13 mm
14 mm
17 mm
17 mm
19 mm
19 mm
21 mm
21 mm
21 mm
22 mm
24 mm
26 mm
30 mm
B
B
B
B
B
B
B
D
D
D
D
D
D
D
M 12
Hexagon socket
12.7 mm
(1/2")
Square
drive
dimension
Sq (mm)
Part
name
Code
No.
Nominal diameter of applicable bolts Dihedral
width
H (mm)
Shape
Socket primary dimensions
(mm)
L
ISO
(Ordinary)
ISO
(Small type)
Inch
screw
High-tension L2
34
34
34
34
57
34
57
34
57
107
34
34
57
57

--- 6 ---
(3) Extension bar (Code No. 873633)
(4) Corner attachment (EW-14R)
(5) Universal joint (Code No. 986062)
(6) Side handle (Code No. 323774)

--- 7 ---
Note 1) The cord, socket and side handle are excluded.
M 12 --- M 22
M 12 --- M 16
360
3,670
3,190
12.7 (1/2")
1,900
2,100
HITACHI
WR 16SA
Maker •Model
Item
Capacity
258 x 225
(10-5/32" x 8-55/64")
Ordinary bolt
High-tension bolt
Max. tightening torque
Square drive dimension
/min
No-load rotation speed
Impact rate
Center height
/min
Main body weight Note 1)
mm
mm
kg
Voltage
Tumbler switch
with forward/
reverse
changeover
pushing button
Input
Rated current
Max. efficiency
Soft handle
m
Type of switch
Insulation method
Carbon brush
Cord length
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Specification Comparisons
Overall length x height
Motor specifications
No-load rotation speed
Lock current
Motor characteristics
N.m
kgf.cm
in.lbs
mm
A
/min
V
W
A
%
230
23,400
21.0
480
2.2
54
38 (1-1/2")
2.8 (6.2 lbs.)
Single phase AC
commutator motor
Double insulation
Mounted outside
2.5 (8.2 ft)
Provided
M 12 --- M 20
M 12 --- M 16
294
3,000
2,600
12.7 (1/2")
1,700
2,000
HITACHI
WH 16
270 x 215
(10-5/8" x 8-15/32")
Tumbler switch
with forward/
reverse
changeover
pushing button
230
17,000
18.5
440
2.0
46
38 (1-1/2")
2.9 (6.4 lbs.)
Single phase AC
commutator motor
Double insulation
Mounted outside
2.5 (8.2 ft)
Not provided
M 12 --- M 22
M 12 --- M 16
350
3,570
3,100
12.7 (1/2")
2,000
2,000
C
283 x 235
(11-9/64" x 9-1/4")
Tumbler switch
with forward/
reverse
changeover
pushing button
230
22,800
400
1.8
37.5 (1-32/15")
2.9 (6.4 lbs.)
Single phase AC
commutator motor
Double insulation
Mounted outside
2.5 (8.2 ft)
Provided
M 6 --- M 18
70 --- 250
710 --- 2,550
620 --- 2,210
12.7 (1/2")
800 --- 1,900
1,000 --- 2,600
B
320 x 190
(12-19/32" x 7-31/64")
Staplessly
variable speed
trigger switch
with forward/
reverse
changeover
pushing button
230
27,200
500
2.3
37.5 (1-32/15")
3.2 (7.0 lbs.)
Single phase AC
commutator motor
Double insulation
Mounted inside
2.5 (8.2 ft)
Not provided
M 18
325
3,320
2,880
12.7 (1/2")
2,100
2,000
P
276 x 217
(10-55/64" x 8-35/64")
Trigger switch
with forward/
reverse
changeover
pushing button
230
20,000
710
3.2
37.5 (1-32/15")
3.2 (7.0 lbs.)
Single phase AC
commutator motor
Double insulation
Mounted outside
2.5 (8.2 ft)
Not provided
<Table 1>