DRIVE SOLUTIONS TRASCO GRMP Series Operating instructions

SIT S.p.A. Viale A. Volta, 2 - 20090 Cusago (MI) - Italy
Tel. [phone] Fax [phone] - [email protected] - www.sitspa.com
TRASCO®Couplings
USER AND MAINTENANCE MANUAL

INDEX Page
1GENERAL INFORMATION 4
1.1 PURPOSE OF THE DOCUMENT 4
1.2 PROPER USE 4
1.3 WARNING SYMBOLS FOR SAFETY 4
1.4 GENERAL ADVICE IN CASE OF DANGER 5
1.5 REFERENCE LAWS AND STANDARDS 5
2CHARACTERISTICS OF TRASCO®COUPLINGS 5
2.1 HUBS 6
2.1.1 GRMP SERIES HUBS 6
2.1.2 GRMALU SERIES HUBS 8
2.1.3 GRB SERIES HUBS 8
2.1.4 GRS SERIES HUBS 10
2.1.5 GRF SERIES HUBS 11
2.1.6 HUBS MACHINING 13
2.1.7 POSITION AND SIZE OF THE SETSCREW 14
2.2 ELASTIC SPIDER 15
2.2.1 ELASTIC SPIDER PERFORMANCE 16
2.3 COUPLING MISALIGNMENTS 17
3STORAGE 17
4ASSEMBLY 18
4.1 GRMP COUPLING ASSEMBLY 18
4.2 GRB COUPLING ASSEMBLY 20
4.2.1 TAPER BUSH MOUNTING 20
4.2.2 TAPER BUSH DISASSEMBLY 21
4.3 GRS COUPLING ASSEMBLY 21
44 GRF COUPLING ASSEMBLY 22
4.4.1 FLANGE-FLANGE VERSION 22
4.4.2 SHAFT-FLANGE VERSION 23
4.4.3 SHAFT-SHAFT VERSION 24
5ATEX ANNEX 25
5.1 ATEX ZONE CLASSIFICATION 25
5.2 ATEX EQUIPMENT CLASSIFICATION 26
5.3 APPROPRIATE USE OF TRASCO®COUPLINGS IN ATEX ZONES 26
5.3.1 GAS TEMPERATURE CLASSES FOR GROUP II EQUIPMENT
AND MAXIMUM SURFACE TEMPERATURE FOR EQUIPMENT OF GROUP III 26
5.3.2 TEMPERATURE CLASSES FOR GROUP I EQUIPMENT 27
5.4 MARKING 27
5.4.1 COMPLETE MARKING 27
5.4.2 COMPACT MARKING 28
5.5 HUB MACHINING IN ATEX ENVIRONMENT 28
5.6 ELASTIC SPIDER CHECK 28
5.7 INTERNAL MANUFACTURING CHECK 29
5.8 STARTING 29
5.8.1 PROTECTION DEVICES FOR COUPLINGS IN HAZARDOUS ATMOSPHERES 30
5.8.2 ELECTRICAL CONTINUITY 30
5.9 DECLARATION OF CONFORMITY 31

INDEX OF TABLES Page
TABLE 2.1 TRASCO®: HUBS MATERIALS 6
TABLE 2.2 TRASCO®GRMP DIMENSIONS 7
TABLE 2.3 TRASCO®GRMP LENGTHS 7
TABLE 2.4 TRASCO®GRMALU DIMENSIONS 8
TABLE 2.5 TRASCO®GRB DIMENSIONS 9
TABLE 2.6 TRASCO®GRS DIMENSIONS 10
TABLE 2.7 TRASCO®GRF DIMENSIONS 11
TABLE 2.8 TRASCO®GRF C DIMENSIONS 12
TABLE 2.9 TRASCO®: SETSREW POSITION 14
TABLE 2.10 ELASTIC SPIDER PERFORMANCE 16
TABLE 2.11 TRASCO®: MISALIGNMENTS 17
TABLE 4.1 M VALUE 19
TABLE 4.2 CONICAL CLAMPING BUSHES SETSCREW 20
TABLE 4.3 GRF SCREWS 22
TABLE 5.1 ATEX ZONE CLASSIFICATION 25
TABLE 5.2 ATEX GROUPS AND CATEGORIES CLASSIFICATION 26
TABLE 5.3 GAS TEMPERATURE CLASSES 26
TABLE 5.4 QUOTE Z FOR CHECKING SPIDER WEAR 28
INDEX OF FIGURES Page
FIGURE 2-1 TRASCO®GRMP HUBS 6
FIGURE 2-2 TRASCO®SERIES GRB 8
FIGURE 2-3 TRASCO®SERIES GRS 10
FIGURE 2-4 TRASCO®GRF HUBS 11
FIGURE 2-5 TRASCO®GRF C HUBS 12
FIGURE 2-6 PROCESSING TOLERANCE 13
FIGURE 2-7 SETSCREW POSITION 14
FIGURE 2-8 ELASTIC SPIDER 15
FIGURE 2-9 TRASCO®: MISALIGNMENTS 17
FIGURE 4-1 GRMP COUPLING 18
FIGURE 4-2 GRMP: MOUNTING 19
FIGURE 4-3 TYPES OF GRB 20
FIGURE 4-4 GRS INTERMEDIATE ELEMENT 21
FIGURE 4-5 FLANGE-FLANGE VERSION (CF/CFN) 22
FIGURE 4-6 SHAFT-FLANGE VERSION (CF/CFN) 23
FIGURE 4-7 SHAFT-SHAFT VERSION (CF/CFN) 24

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1 General information
1.1 Purpose of the document
1.2 Proper use
1.3 Warning symbols for safety
We recommend that you carefully read all the mounting instructions before installing the coupling, paying particular attention to the safety
instructions.
TRASCO®coupling is suitable for use in potentially explosive atmospheres. When using the coupling in hazardous areas, strictly observe
the special information and instructions regarding safety in the ATEX attachment.
The mounting instructions are part of the product; please keep them safe and close to the coupling.
They are available in electronic format on the website www.sitspa.com.
All the rights of this manual are reserved and are the property of SIT S.p.A.; therefore, its sale and reproduction without permission are
prohibited.
The purpose of this document is the description of the TRASCO®couplings, both in the standard version and in the version suitable for
use in potentially explosive environments in accordance with ATEX Directive 2014/34/EU.
All the indications are provided, so that it is properly dimensioned, stored and assembled.
As regards the couplings that have to work in potentially explosive environments, all the indications and standards for identifying the
installation areas for which the coupling is certified to operate in safe conditions are provided.
Before handling a SIT coupling for moving, installing, or performing maintenance, it is advisable to carefully read the mounting instructions.
Any kind of changes aren’t authorized except those expressly provided for in the operating and maintenance manual.
SIT assumes no liability for damage resulting from tampered material and, therefore, no longer original.
SIT reserves the right to make changes to the product; as a consequence, this manual will be updated. The technical specifications listed
in the operating and maintenance manual exactly match the state of the art at the time of printing.
The warning symbols included in this manual alert the user to possible risks that may occur during handling, assembling and use of the
coupling.
It is necessary to pay particular attention to them.
STOP
DANGER Danger of injury to persons.
CAUTION Possible damages to the machine.
ATTENTION Important guidelines to follow.
PRECAUTION Hints about explosion protections.

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1.4 General advice in case of danger
1.5 Reference laws and standards
2 Characteristics of TRASCO®couplings
DANGER!
Every operation performed on the coupling, either with mounting or
maintenance, must be carried out with the machine not connected
to the power supply. Accidental contact with the rotating parts can
cause serious injury to the operator. It is recommended to read these
operating instructions to ensure safety.
STOP
• Affix proper warning signs around the machine
• Instruct the operator before giving permission to work on the coupling
• Operate on the coupling and on the transmission in safe conditions
• Make sure the machine power is disconnected before carrying out any operation
• Do not touch any moving part of the machine and wait until it stops completely
• Protect the coupling against accidental contact with protection devices
This evaluation was carried out in accordance with the provisions of the relevant laws, directives, standards mentioned below:
TRASCO®couplings are a flexible and constant-velocity coupling that ensures maximum performance with same overall dimensions.
It is very compact and allows a safe transmission of motion between the motor and the driven machine, absorbing shocks and torsional
vibrations. It also allows, through the elastic deformation of the elastic spider, to compensate for angular, radial and axial misalignments
due to small variations in length of the shafts. The hub teeth and spider profiles are designed so as to obtain a uniform pressure
distribution.
The elastic element is subject only to compression stress and does not induce any axial or radial stresses, providing the TRASCO®
coupling with great load capacity and durability. The coupling can be assembled both horizontally and vertically, and it correctly tolerates
load variations and reversals.
DIN 740/2 Reference standard for flexible couplings
ATEX DIRECTIVE 2014/34/EU Equipment and protective systems intended for use in potentially explosive atmospheres
ATEX GUIDELINES 2014/34/EU Guidelines to the application of Directive 2014/34/EU
EN 1127-1:2011 Explosion prevention and protection against explosion. Basic concepts and methodology
EN ISO 80079-36:2016 Explosive environments – part 36. Non-electrical equipment for potentially explosive atmospheres.
Basic method and requirements
EN ISO 80079-37:2016
Explosive environments – part 37. Non-electrical equipment for potentially explosive atmospheres.
Non-electrical equipment constructional safety type "c", control of the sources of ignition type “b”,
immersion in liquid type “k”.
The TRASCO®series is suitable for use in areas classified with the
presence of flammable gases, vapours and mists or combustible
dusts (Zone 1/21, category 2 GD, EPL Gb Db) and applications in
mining (Group I, category M2, EPL Mb).
It is designed and built in accordance with the ATEX Directive
2014/34/EU and in accordance with the following European
standards:
• EN 1127-1:2011
• EN ISO 80079-36:2016
• EN ISO 80079-36:2016

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2.1 Hubs
2.1.1 GRMP series hubs
The TRASCO®coupling consists of two metal hubs that have cut-outs with circular sections which contain the teeth of the elastic spider.
The materials of standard hubs are laminated cast iron, spheroidal cast iron or aluminium, depending on the types and sizes.
For details see TABLE 2.1 - TRASCO®: hubs materials.
TABLE 2.1 - TRASCO®: hubs materials
The TRASCO®hubs series GRMP are made, depending on the size, in two versions: A (hollow) and B (full).
They are different for the exterior design and for the maximum bore that can be achieved.
Each of them has the respective AL and BL extended version (TABLE 2.2 - TRASCO®GRMP dimensions, TABLE 2.3 - TRASCO®
GRMP lengths).
The milling of the seat of the flexible element of the GRMP guarantees a perfect coupling with the elastic spider in order to ensure a long
life in the correct operating conditions.
Note: For details contact the Technical Department.
SERIES SIZE STANDARD MATERIAL OPTIONAL MATERIALS
GRMP
19/24 Steel sintered Steel / Stainless steel / Aluminium / Spheroidal cast iron
from 24/32 to 90/100 Grey cast iron Steel / Stainless steel / Aluminium / Spheroidal cast iron
from 100/110 to 180/200 Spheroidal cast iron Steel / Stainless steel / Aluminium / Spheroidal cast iron
GRMALU All Aluminium diecast Steel / Stainless steel / Aluminium / Spheroidal cast iron
GRB All Grey cast iron Steel / Stainless steel / Aluminium / Spheroidal cast iron
GRS All Aluminium Steel / Stainless steel / Aluminium / Spheroidal cast iron
GRF All Spheroidal cast iron Steel / Stainless steel / Aluminium / Spheroidal cast iron
A B AL BL
Figure 2-1 - GRMP TRASCO
®
Hubs
M
N
I
H
A
B
E
L
P
SS
I
t
G
bF
gF
gF
aF
LC/1/701021
H
GRMP...A
AR
GRMP...B
Mozzo
“A”
Mozzo
“B”
Hub Hub

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Table 2.2 - TRASCO®GRMP Dimensions
Table 2.3 - TRASCO®GRMP lengths
SIZE Fa Fb
max
Fg
E A B M S N G
max Fb AL BL
19/24 - 24 - - - - 40 - 40 16 2 12 18
24/32 24 32 8 10 8 10 55 40 55 18 2 14 27
28/38 28 38 8 10 8 10 65 48 65 20 2,5 15 30
38/45 38 45 10 12 14 14 80 66 80 24 3 18 38
42/55 42 55 10 12 16 16 95 75 95 26 3 20 46
48/60 48 60 12 12 16 16 105 85 105 28 3,5 21 51
55/70 55 70 15 15 16 16 120 98 120 30 4 22 60
65/75 65 75 15 15 20 20 135 115 135 35 4,5 26 68
75/90 75 90 15 15 22 22 160 135 160 40 5 30 80
90/100 90 100 20 20 30 30 200 160 180 45 5,5 34 100
100/110 115 - 45 - - - 225 180 - 50 6 38 113
110/125 125 - 55 - - - 255 200 - 55 6,5 42 127
125/145 145 - 55 - - - 290 230 - 60 7 46 147
140/160 160 - 55 - - - 320 255 - 65 7,5 50 165
160/185 185 - 75 - - - 370 290 - 75 9 57 190
180/200 200 - 80 - - - 420 325 - 85 10,5 64 220
SIZE
Execution A Execution B Execution AL Execution BL
H L (A+A) I H L (B+B) I H L (AL+AL) I H L (BL+BL) I
19/24 - - - 25 66 - - - - 50 - -
24/32 30 78 24 30 78 - 50 118 44 60 116 -
28/38 35 90 28 35 90 - 60 140 53 80 180 -
38/45 45 114 37 45 114 - 80 184 72 110 244 -
42/55 50 126 40 50 126 - 110 246 100 110 246 -
48/60 56 140 45 56 140 - 110 248 99 140 308 -
55/70 65 160 52 65 160 - 110 250 97 140 310 -
65/75 75 185 61 75 185 - 140 315 126 140 315 -
75/90 85 210 69 85 210 - 140 320 124 170 380 -
90/100 100 245 81 100 245 81 170 385 151 210 465 191
100/110 110 270 89 110 270 - - - - - - -
110/125 120 295 96 120 295 - - - - - - -
125/145 140 340 112 140 340 - - - - - - -
140/160 155 375 124 - - - - - - - - -
160/185 175 425 140 - - - - - - - - -
180/200 195 475 156 - - - - - - - - -
* measures in mm
* measures in mm

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2.1.2 GRMALU series hubs
2.1.3 GRB series hubs
The TRASCO®GRMALU series hubs are made of die-casting aluminium for A and B versions
(TABLE 2.4 - TRASCO®GRMALU dimensions).
The TRASCO®GRB series couplings for taper bush combines high performance characteristics, typical of standard hub coupling,
the ease of use, assembly and disassembly, resulting from the coupling with a SER-SIT®taper bush. (TABLE 2.5 - TRASCO®GRB
dimensions).
They are produced in two versions:
• B1, with bush mounting from the outside of the hub
• B2, with bush mounting from the inside of the hub
* measures in mm
SIZE Fa
max
Fb
max
Fg
E A B L H M S N I G t P
A B
19/24 - 24 - - 40 40 40 66 25 16 2 12 - 18 10 M5
24/32 24 32 - - 55 40 55 78 30 18 2 14 24 27 10 M5
28/38 28 38 12 28 65 48 65 90 35 20 2,5 15 28 30 15 M6
38/45 38 45 22 38 80 66 77 114 45 24 3 18 37 38 15 M8
42/55 - 55 - 22 95 - 95 126 50 26 3 20 - 46 20 M8
48/60 - 60 - 30 105 - 105 140 56 28 3,5 21 - 51 20 M8
Ød Ød
L
ØB ØB
ØE
I I
NS
H H
S
M
B2
Ød
Ød
L
II
NS S
H HM
ØB
ØB
ØE
B1
Ød Ød
L
ØB ØB
ØE
I I
NS
H H
S
M
B2
Ød
Ød
L
II
NS S
H HM
ØB
ØB
ØE
B1
Figure 2-2 - TRASCO®GRB Series
B1 B2
Table 2.4 - TRASCO®GRMALU Dimensions
Ød Ød
L
ØB ØB
ØE
I I
NS
H H
S
M
B2
Ød
Ød
L
II
NS S
H HM
ØB
ØB
ØE
B1
Ød Ød
L
ØB ØB
ØE
I I
NS
H H
S
M
B2
Ød
Ød
L
II
NS S
H HM
ØB
ØB
ØE
B1
M
N
I
H
A
B
E
L
P
SS
I
t
G
bF
gF
gF
aF
LC/1/701021
H
GRMP...A
AR
GRMP...B
Mozzo
“A”
Mozzo
“B”
Hub Hub

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Table 2.5 - TRASCO®GRB Dimensions
SIZE SER-SIT®
TAPER BUSH E B L H M S N I
28/38 1108 (2820) 65 65 66 23 20 2,5 15 -
38/45 1108 (2820) 80 78 70 23 24 3 18 15
42/55 1610 (4025) 95 94 78 26 26 3 20 16
48/60 1615 (4040) 105 104 106 39 28 3,5 21 28
55/70 2012 (5030) 120 118 96 33 30 4 22 20
65/75 2012 (5030) 135 133 101 33 35 4,5 26 19
75/90 2517 (6545) 160 158 130 45 40 5 30 36
90/100** 3535 (9090) 200 180 223 89 45 5,5 34 70
SER-SIT®SIZE BORE DIAMETER (H7)
Tolerance of the seat of the keyway JS9
Torque
[Nm]
1108 (2820)
[mm] 9 10 11 12 14 15 16 18 19 20 22 24 25 26 27 28
150
[inches] 3/8 - 1/2 - 5/8 - 3/4 - 7/8 - 1 - 11/8
1610 (4025)
[mm] 12 14 15 16 18 19 20 22 24 25 26 28 30 32 35 38 40 42
490
[inches] 3/8 - 1/2 - 5/8 - 3/4 - 7/8 -1 -11/8 -11/4 -13/8 -11/2 -15/8
1615 (4040)
[mm] 12 14 15 16 18 19 20 22 24 25 28 30 32 35 38 40 42
490
[inches] 1/2 - 5/8 - 3/4 - 7/8 - 1 - 11/8 - 11/4 - 13/8 - 11/2 - 15/8 - 13/4
2012 (5030)
[mm] 14 15 16 18 19 20 22 24 25 26 28 30 32 35 38 40 42 45 48 50
800
[inches] 5/8 -3/4 - 7/8 -1 -11/8 -11/4 -13/8 -11/2 -15/8 -13/4 -17/8 - 2
2517 (6545)
[mm] 6 18 19 20 22 24 25 28 30 32 35 38 40 42 45 48 50 55 60 65
1300
[inches] 3/4 - 7/8 - 1 - 11/8 - 11/4 - 13/8 - 11/2 - 15/8 - 13/4 - 17/8 - 2 - 21/8 21/4 - 2 3/8 - 21/2
3535 (9090)
[mm] 25 28 30 32 35 38 40 42 45 48 50 55 60 65 70 75 80 85 90
5000
[inches] 11/2 - 15/8 - 13/4 - 17/8 - 2 - 21/8 - 21/4 - 2 3/8 - 21/2 - 2 5/8 - 23/4 - 2 7/8 - 3 - 31/8 - 31/4 - 33/8 - 31/2
* measures in mm
** Transmittable friction torque without the keyway
* measures in mm
** available only in version B1.

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2.1.4 GRS series hubs
The GRS series hubs are intermediate elements that increase the ability of the coupling to compensate for axial, radial and angular
misalignments.
The presence of two elastic spiders allows a high damping effect of the vibrations, with consequent reduction of the transmission noise
and a reduced wear of the connected components, such as bearings.
Figure 2-3 - TRASCO
®
GRS series
Table 2.6 - TRASCO®GRS Dimensions
SIZE Fa Fb H V C M S N L E A B G ΔKr ΔKw
24/32 9 - 24 11 - 32 30 16 52 18 2 14 112 55 40 55 27 0,89 1°30’
28/38 9 - 28 11 - 38 35 18 58 20 2,5 15 128 65 48 65 30 1 1°30’
38/45 11 - 38 13 - 45 45 20 68 24 3 18 158 80 66 80 38 1,15 1°30’
42/55 11 - 42 13 - 55 50 22 74 26 3 20 174 95 75 95 46 1,26 1°30’
48/60 13 - 48 13 - 60 56 24 80 28 3,5 21 192 105 85 105 51 1,36 1°30’
55/70 16 - 55 16 - 70 65 28 88 30 4 22 218 120 98 120 60 1,52 1°30’
65/75 16 - 65 16 - 75 75 32 102 35 4,5 26 252 135 115 135 68 1,75 1°30’
75/90 16 - 75 16 - 90 85 36 116 40 5 30 286 160 135 160 80 2 1°30’
90/100 21 - 90 21 - 100 100 40 130 45 5,5 34 330 200 160 180 100 2,5 1°30’
ØFa
S S
M V M
ØFb
ØG
L
ØA
ØE
S N N S
I I
H C H
ØB
GRS
GRMP...B
GRMP...A
AR
AR
* measures in mm

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2.1.5 GRF series hubs
The GRF series is the flange version that fits all the hubs of the TRASCO®family.
There are three different possibilities of coupling:
• Flange-flange: through the fastening bores of the flange CF (CFN in the compact version)
• Shaft-flange: on the shaft side, it is possible to install any hub of the TRASCO®family
• Shaft-shaft: with this version, it is possible to replace the flexible element without moving the hubs on the shafts or motor and driven
machine.
FLANGE - FLANGE SHAFT - FLANGE SHAFT - SHAFT
Figure 2-4 - GRF TRASCO
®
Hubs
Table 2.7 - TRASCO®GRF Dimensions
SIZE Fa
min
Fa
max E Ea A C D No. screws P G H Bb Bc I V M S N La Lb Lc
19/24 6 19 40 65 40/32 40 50 5 4,5 18 25 26 1,5 17 8 16 2 12 32 82 49
24/32 8 24 55 80 55/40 55 65 5 4,5 27 30 31 1,5 22 8 18 2 14 34 94 56
28/38 10 28 65 100 65/48 65 80 6 6,5 30 35 36 1,5 25 10 20 2,5 15 40 110 65
38/45 12 38 80 115 66 80 95 6 6,5 38 45 46 1,5 35 10 24 3 18 44 134 79
42/55 14 42 95 140 75 95 115 6 9 46 50 51 2 38 12 26 3 20 50 150 88
48/60 15 48 105 150 85 105 125 8 9 51 56 57 2 44 12 28 3,5 21 52 164 96
55/70 20 55 120 175 98 120 145 8 11 60 65 66 2 49 16 30 4 22 62 192 111
65/75 22 65 135 190 115 135 160 10 11 68 75 76 2 59 16 35 4,5 26 67 217 126
75/90 30 75 160 215 135 160 185 10 14 80 85 87 2,5 66 19 40 5 30 78 248 144
90/100 40 90 200 260 160 200 225 12 14 100 100 102 3 80 20 45 5,5 34 85 285 165
100/110 45 115 225 285 180 225 250 12 14 113 110 112 4 85 25 50 6 38 100 320 185
110/125 55 125 255 330 200 255 290 12 18 127 120 122 4 94 26 55 6,5 42 107 347 201
125/145 55 145 290 370 230 290 325 16 18 147 140 142 5 110 30 60 7 46 120 400 230
BF
GRMP...A
AR
CFF
MF
A
E
I
V HH M
A
Ea
Bb
Lb
S N S
Fa
G
Fa
CF
GRMP...A
A
E
H M V
S
P
Lc
Ea
Bc
N
S
Fa
C
D Nr
G
E
E
CF
CF
S
Ea
E
V
Bc
P
C
N S
M V
La
D Nr
G
S
Ea
E
V
Fa
A
H
I
A
G
Lb
S
N
M V H
Bb
I
Fa
MF
CFF
AR
MF
CFF
CF
2CF
BF
GRMP...A
AR
CFF
MF
A
E
I
V HH
M
A
Ea
Bb
Lb
S N S
Fa
G
Fa
CF
GRMP...A
A
E
H M V
S
P
Lc
Ea
Bc
N S
Fa
C
D Nr
G
E
E
CF
CF
S
Ea
E
V
Bc
P
C
N S
M V
La
D Nr
G
S
Ea
E
V
Fa
A
H
I
A
G
Lb
S N
M V H
Bb
I
Fa
MF
CFF
AR
MF
CFF
CF
2CF
BF
GRMP...A
AR
CFF
MF
A
E
I
V HH
M
A
Ea
Bb
Lb
S N S
Fa
G
Fa
CF
GRMP...A
A
E
H M V
S
P
Lc
Ea
Bc
N S
Fa
C
D Nr
G
E
E
CF
CF
S
Ea
E
V
Bc
P
C
N S
M V
La
D Nr
G
S
Ea
E
V
Fa
A
H
I
A
G
Lb
S N
M V H
Bb
I
Fa
MF
CFF
AR
MF
CFF
CF
2CF
BF
GRMP...A
AR
CFF
MF
A
E
I
V HH
M
A
Ea
Bb
Lb
S N S
Fa
G
Fa
CF
GRMP...A
A
E
H M V
S
P
Lc
Ea
Bc
N S
Fa
C
D Nr
G
E
E
CF
CF
S
Ea
E
V
Bc
P
C
N S
M V
La
D Nr
G
S
Ea
E
V
Fa
A
H
I
A
G
Lb
S N
M V H
Bb
I
Fa
MF
CFF
AR
MF
CFF
CF
2CF
* measures in mm

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FLANGE - FLANGE SHAFT - FLANGE SHAFT - SHAFT
Figure 2-5 - GRF C Hubs
Table 2.8 - TRASCO®GRF C Dimensions
E
A
H
N SS
M
V
Bc
E
Lc
Fa
D Nr
G
C
P
GRMP...A
BFN
AR
CFN
MFN
N
S
Bc
E
S
M VV
La
D Nr
P
Fa
G
N
E
S S
M
V V H
I
H
I
B
B
Bb
Lb
D Nr
G
C
P
Fa
Fa
ALBERO-FLANGIA FLANGIA-FLANGIA
ALBERO-ALBERO
E
A
H
N SS
M
V
Bc
E
Lc
Fa
D Nr
G
C
P
GRMP...A
BFN
AR
CFN
MFN
N
S
Bc
E
S
M VV
La
D Nr
P
Fa
G
N
E
S S
M
V V H
I
H
I
B
B
Bb
Lb
D Nr
G
C
P
Fa
Fa
ALBERO-FLANGIA FLANGIA-FLANGIA
ALBERO-ALBERO
E
A
H
N SS
M
V
Bc
E
Lc
Fa
D Nr
G
C
P
GRMP...A
BFN
AR
CFN
MFN
N
S
Bc
E
S
M VV
La
D Nr
P
Fa
G
N
E
S S
M
V V H
I
H
I
B
B
Bb
Lb
D Nr
G
C
P
Fa
Fa
ALBERO-FLANGIA FLANGIA-FLANGIA
ALBERO-ALBERO
E
A
H
N SS
M V
Bc
E
Lc
Fa
D Nr
G
C
P
GRMP...A
BFN
AR
CFN
MFN
N
S
Bc
E
S
M VV
La
D Nr
P
Fa
G
N
E
S S
M
V V H
I
H
I
B
B
Bb
Lb
D Nr
G
C
P
Fa
Fa
ALBERO-FLANGIA FLANGIA-FLANGIA
ALBERO-ALBERO
E
A
H
N SS
M V
Bc
E
Lc
Fa
D Nr
G
C
P
GRMP...A
BFN
AR
CFN
MFN
N
S
Bc
E
S
M VV
La
D Nr
P
Fa
G
N
E
S S
M V V H
I
H
I
B
B
Bb
Lb
D Nr
G
C
P
Fa
Fa
ALBERO-FLANGIA FLANGIA-FLANGIA
ALBERO-ALBERO
E
A
H
N SS
M V
Bc
E
Lc
Fa
D Nr
G
C
P
GRMP...A
BFN
AR
CFN
MFN
N
S
Bc
E
S
M VV
La
D Nr
P
Fa
G
N
E
S S
M V V H
I
H
I
B
B
Bb
Lb
D Nr
G
C
P
Fa
Fa
ALBERO-FLANGIA FLANGIA-FLANGIA
ALBERO-ALBERO
* measures in mm
SIZE Fa
min
Fa
max E A B H I La Lb Lc V M S N Bb Bc G D Nr C P
24/32 8 24 55 40 36 30 22 34 94 56 8 18 2 14 31 1,5 27 45 8 36 M5
28/38 10 28 65 48 42 35 25 40 110 65 10 20 2,5 15 36 1,5 30 54 8 44 M6
38/45 12 38 80 66 52 45 35 44 134 79 10 24 3 18 46 1,5 38 66 8 54 M8
42/55 14 42 95 75 62 50 38 50 150 88 12 26 3 20 51 2 46 80 12 65 M8
48/60 15 48 105 85 70 56 44 52 164 96 12 28 3,5 21 57 2 51 90 12 75 M8
55/70 20 55 120 98 80 65 49 62 192 111 16 30 4 22 66 2 60 102 8 84 M10
65/75 22 65 135 115 94 75 59 67 217 126 16 35 4,5 26 76 2 68 116 12 96 M10
75/90 30 75 160 135 108 85 66 78 248 144 19 40 5 30 87 2,5 80 136 15 112 M12
90/100 40 90 200 160 142 100 80 85 285 165 20 45 5,5 34 102 3 100 172 15 145 M16
100/110 45 115 225 180 158 110 85 100 320 185 25 50 6 38 112 4 113 195 15 165 M16
110/125 55 125 255 200 178 120 94 107 347 201 26 55 6,5 42 122 4 127 218 15 180 M20
125/145 55 145 290 230 206 140 110 120 400 230 30 60 7 46 142 5 147 252 15 215 M20

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2.1.6 Hubs machining
Any machining of the hubs must not compromise its functionality.
As for the maximum diameter of the bore that can be achieved, please refer to the table in the catalogue.
The bore machining must be carried out in accordance with the concentricity values with the outer diameter and the perpendicularity
values between the hole and the flat internal surface of the hub with a degree of tolerance IT8.
It is important not to exceed, for all the materials of which the hub is composed, the maximum value of the hole provided by SIT and
reported in the technical catalogue; if this value is not respected the coupling may break, causing serious dangers during the rotation.
Figure 2-6 - Processing tolerance
STOP
DANGER!
The maximum bore allowed and indicated in the catalogue table must not
be exceeded. Higher values could cause breakage and danger around
the machine.
If the hub bore is machined by the customer, the concentricity and radial
oscillation values specified by SIT must be respected.
Carefully align the hubs when machining the finished bore.
CAUTION!
The customer is responsible for all the machining performed.
SIT assumes no liability arising from incorrect machining or for failure
to observe the instructions contained in this manual and in the technical
catalogue.
PRECAUTION!
Except for the machining of the hole, the seat of the keyway and the
threaded bore for the setscrew in accordance with the values shown in
the technical catalogue, any machining of couplings that must be used in
hazardous areas must obtain the express permission of SIT.
The customer must provide SIT with a technical drawing which shows the
machining to be carried out. It is the responsibility of SIT to evaluate and
approve it.
Any spare parts for these couplings must be standard hubs unbored or
with pilot bore marked with the ATEX marking.

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2.1.7 Position and size of the setscrew
SIT supplies flathead setscrews class 45H according to DIN 913 for fastening the hub on the shaft.
For the position and size of the setscrews, refer to TABLE 2.9 - TRASCO®: setscrew position and to the drawing of FIGURE 2-7 -
Setscrew position.
Figure 2-7 - Setscrew position
t
P
GRMP....A
Table 2.9 - TRASCO®: Setscrew position
SIZE THREAD DISTANCE
[mm]
THIGHTNING TORQUE
[Nm]
19/24 M5 10 2
24/32 M5 10 2
28/38 M6 15 4,8
38/45 M8 15 10
42/55 M8 20 10
48/60 M8 20 10
55/70 M10 20 17
65/75 M10 20 17
75/90 M10 25 17
90/100 M12 30 40
100/110 M12 30 40
110/125 M16 35 80
125/145 M16 40 80
140/160 M20 45 140
160/185 M20 50 140
180/200 M20 50 140

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2.2 Elastic spider
The elastic spider is a toothed ring produced with special polyurethane compounds that allows for optimised coupling performance
according to the application.
The flexible element is particularly resistant to ageing, hydrolysis (therefore also suitable for tropical climates), fatigue, abrasion and is
self-damping.
The spiders are available, as standard product, in three hardness to suit different applications and related operating temperature:
• Yellow ring 92 Sh A -40 °C / + 90 °C
• Red ring 98 Sh A -30 °C / + 90 °C
• Green ring 64 Sh D -30 °C / + 110 °C
Figure 2-8 - Elastic spider

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2.2.1 Elastic spider performance
Note: For GRB and GRCAL types it is necessary to check the transmissible torque capacity, respectively, as from the bush and clamp
Table 2.10 - Elastic spider performance
SIZE COLOUR HARDNESS
[Shore]
RATED TORQUE
Tkn
[Nm]
MAXIMUM TORQUE
Tmax
[Nm]
VIBRATORY TORQUE
Tkw
[Nm]
MAXIMUM SPEED
[rpm]
19/24
Yellow 92 Sh A 10 20 2,7 14000
Red 98 Sh A 17 34 4,4 14000
Green 64 Sh D 21 42 5,5 14000
24/32
Yellow 92 Sh A 35 70 9 10600
Red 98 Sh A 60 120 16 10600
Green 64 Sh D 75 150 19,5 10600
28/38
Yellow 92 Sh A 95 190 25 8500
Red 98 Sh A 160 320 42 8500
Green 64 Sh D 200 400 52 8500
38/45
Yellow 92 Sh A 190 380 49 7100
Red 98 Sh A 325 650 85 7100
Green 64 Sh D 405 810 105 7100
42/55
Yellow 92 Sh A 265 530 69 6000
Red 98 Sh A 450 900 117 6000
Green 64 Sh D 560 1120 145 6000
48/60
Yellow 92 Sh A 310 620 81 5600
Red 98 Sh A 525 1050 137 5600
Green 64 Sh D 655 1310 170 5600
55/70
Yellow 92 Sh A 410 820 107 4750
Red 98 Sh A 680 1250 178 4750
Green 64 Sh D 825 1650 215 4750
65/75
Yellow 92 Sh A 625 1250 163 4250
Red 98 Sh A 950 1900 245 4250
Green 64 Sh D 1175 2350 305 4250
75/90
Yellow 92 Sh A 1280 2560 333 3550
Red 98 Sh A 1950 3900 500 3550
Green 64 Sh D 2410 4820 325 3550
90/100
Yellow 92 Sh A 2400 4800 624 2800
Red 98 Sh A 3600 7200 936 2800
Green 64 Sh D 4500 9000 1170 2800
100/110
Yellow 92 Sh A 3300 6600 860 2500
Red 98 Sh A 4950 9900 1290 2500
Green 64 Sh D 6200 12400 1600 2500
110/125
Yellow 92 Sh A 4800 9600 1250 2240
Red 98 Sh A 7200 14400 1870 2240
Green 64 Sh D 9000 18000 2340 2240
125/145
Yellow 92 Sh A 6650 13300 1730 2000
Red 98 Sh A 10000 20000 2600 2000
Green 64 Sh D 12500 25000 3250 2000
140/160 Red 95 Sh A 12800 25600 3328 1800
160/185 Red 95 Sh A 19200 38400 4992 1500
180/200 Red 95 Sh A 28000 56000 7280 1400

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2.3 Coupling misalignments
3 Storage
TABLE 2.11 shows the misalignment values based on the different coupling sizes that can accomodated.
In order to guarantee a long life of the coupling, it is necessary to pay close attention to the alignment.
The couplings must be stored in covered and dry places.
It is important that the storage areas are protected against light sources, ultraviolet lamps, mercury vapour and high electrical voltage
sources.
The moisture percentage must be maintained below 65%.
In good storage conditions the characteristics of the spiders can remain unchanged for up to 6 years.
Axial misalignment Axial misalignment Axial misalignment
Figure 2-9 - TRASCO
®
: misalignments
SIZE Axial mis. ΔKa
[mm]
Angular mis. ΔKw
[°]
Radial mis. ΔKr
[mm]
19/24 1,2 1°30’ 0,20
24/32 1,4 1°30’ 0,22
28/38 1,5 1°30’ 0,25
38/45 1,8 1°30’ 0,28
42/55 2,0 1°30’ 0,32
48/60 2,1 1°30’ 0,36
55/70 2,2 1°30’ 0,38
65/75 2,6 1°30’ 0,42
75/90 3,0 1°30’ 0,48
90/100 3,4 1°30’ 0,50
100/110 3,8 1°30’ 0,52
110/125 4,2 1°30’ 0,55
125/145 4,6 1°30’ 0,60
140/160 5,0 1°30’ 0,62
160/185 5,7 1°30’ 0,64
180/200 6,4 1°30’ 0,68
Table 2.11 - TRASCO®: misalignments
Note: Values valid in room temperature conditions of 20 °C and for speeds up to 1500 rpm. For other conditions, contact our Technical Department.
PRECAUTION!
In case of use in potentially explosive areas of group II with II 2GD and
Group I M2 marking, only half of the above indicated misalignments is
allowed. If these values are not complied with, the coupling is considered
as deliberately damaged.

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4 Assembly
4.1 GRMP coupling assembly
The TRASCO®coupling is supplied unassembled, therefore it is recommended to check the presence of all the components and check
that they match the application requirements.
The characteristic of the TRASCO®family of couplings gives the possibility of mounting any hub version provided that they belong to
the same size.
As regards the hubs, the size is printed on the marking located on the lateral surface.
The size of the spider is printed on a flat surface.
Components:
• 2 hubs
• 1 elastic spider
• 2 setscrews
• Install the hubs on the driving and driven shafts (see FIGURE 4-2 - GRMP: mounting)
• Insert the spider into one of the two hubs
• Check the driving and driven hub to achieve the value M(see FIGURE 4-2 and TABLE 4.1)
• If the motor and driven machine are already firmly assembled, move axially the hubs on the shafts to adjust the Mdimension
• Set the hubs using the setscrews, tightening according to TABLE 2.9 - TRASCO®: SETSCREW POSITION
ATTENTION!
Install the hubs using only with the spider provided by SIT S.p.A. and of
the same size.
SIT S.p.A. assumes no liability for malfunctions and/or failures due to
incorrect assembly or that does not comply with the instructions provided
in this manual.
ATTENTION!
Before assembling SIT recommends to check that the following parts are
matching: shafts diameters, hubs bores, keyways size and their seat on
the hubs.
If the dimensions of shaft and keyway is less than the diameter of the
spider hole, one or both shafts may protrude into the spider.
M
N
I
H
A
B
E
L
P
SS
I
t
G
bF
gF
gF
aF
LC/1/701021
H
GRMP...A
AR
GRMP...B
Mozzo
“A”
Mozzo
“B”
Figure 4-1 - GRMP coupling

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Figure 4-2 - GRMP: mounting
SIZE M VALUE
[mm]
19/24 16
24/32 18
28/38 20
38/45 24
42/55 26
48/60 28
55/70 30
65/75 35
75/90 40
90/100 45
100/110 50
110/125 55
125/145 60
140/160 65
160/185 75
180/200 85
Table 4.1 - M Value
STOP
DANGER!
Touching overheated hubs may causes burns. We recommend wearing
safety gloves.
PRECAUTIONS!
Be very careful in the dangerous areas.
CAUTION!
For the installation make sure that the distance M is maintained in order to ensure
that the spider can be moved axially. If this advice is disregarded, the device could
be damaged.
CAUTION!
If the dimensions of shaft and key is lower than the diameter of the spider hole,
one or both shafts may protrude into the spider.

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4.2 GRB coupling assembling
4.2.1 Taper bush mounting
Components:
• 2 hubs (B1 with bush mounting from the outside, B2 with bush mounting from the inside, FIGURE 4-3 - Types of GRB)
• 1 spider
• 2 bushes
• setscrews
The taper bush SER-SIT®is a clamping device with threaded holes.
Only half of the holes are in the bush, the other half are in the hub.
For correct assembling please follow these guidelines:
• Insert the bush into the hub matching the fastening holes
• Position the setscrews and tighten them partially
• Insert the whole shaft to the desired position (make sure that the Mvalue reported in TABLE 4.1 - M Value is respected) and fully
tighten the setscrews according to the tightening torques specified in TABLE 4.2 - CONICAL CLAMPING BUSHES SETCREWS
• After a short period of operation, please check that the setscrews are not loose.
Ød Ød
L
ØB ØB
ØE
I I
NS
H H
S
M
B2
Ød
Ød
L
II
NS S
H HM
ØB
ØB
ØE
B1
Ød Ød
L
ØB ØB
ØE
I I
NS
H H
S
M
B2
Ød
Ød
L
II
NS S
H HM
ØB
ØB
ØE
B1
B1 B2
Figure 4-3 - Types of GRB
Taper bush size
SER-SIT®
Dimensions Screws Tightening torque
L
[mm]
D
[mm] No. Withworth thread [inch]
Length
[mm]
Wrench
[mm] [Nm]
1108 22,3 38 2 1/4” 13 3 5,5
1610 25,4 57 2 3/8” 16 5 20
1615 38,1 57 2 3/8” 16 5 20
2012 31,8 70 2 7/16” 22 5 30
2517 44,5 85 2 1/2” 25 6 50
3535 88,9 127 3 1/2” 38 10 115
Table 4.2 - Conical clamping bushes setcrews