This document provides information on PTG GC gear couplings, including: 1) The GC coupling line-up covers shaft sizes up to 1000 mm and torques up to 16,000,000 Nm. Standard materials include steel for hubs and sleeves. 2) Dimensions, specifications, and torque ratings are provided for various GC coupling models from GC-50 to GC-1000 in a table. 3) Additional information is given on available materials, seals, hardware, shaft attachments, and lubrication methods for GC couplings.

1. PTG GC couplings 2018 5 7

2. PTG GC GEAR COUPLINGS
Information only.
Detailed information from our sales.

3. GC HAMMASKYTKIMET
GC gear coupling is a torsionally rigid
coupling, which can transmit a high torque
when compared to its physical size. The
crowned gearing can compensate for angular
and radial misalignments between the shafts,
and even long axial strokes can be achieved.
The gear coupling has a very long lifespan,
when correctly dimensioned and lubricated,
and it is easy to tailor to fit almost any drive.
GC gear coupling line-up covers shaft sizes
up to 1000 mm, and torques up to 16 000 000
Nm. Modern and flexible manufacturing
methods make it possible for PTG to supply
customized solutions with a reasonable
delivery time. Special materials and heat
treatments are available on request.
Tambour coupling hubs as well as other hubs
are manufactured with 5 – axis machines.
Marine glassifications are available.

4. GC – Small sizes GC-50 – GC-200
GC – Large sizes GC-220 – GC-1000
GCY – 1-piece sleeve
GCTELA – For rolls, with angular adjustment
GCOB – Offset brake disc between sleeves
GCX – With spacer for long DBSE
GCB – Brake disc between sleeves
GCDE – Disengageable clutch
GCJ – With sleeves mounted on the shafts
GCT – With shear pins
GCL – For long axial stroke
GCV – For vertical drives
GCTAM – Winder / Reel coupling
GC COUPLING LINE-UP

5. Tnom Tmax nmax M J D Dmax Dh Dn D1/D2min D1/D2max Lmin L Lmax Lnmin Ln1/Ln2 Lnmax Dph M Smin S Smax S1min S1 S1max S2min S2 S2max
Nm Nm 1/min kg Kgm2
GC-50 1 920 3 840 8 700 3,6 0,005 111 250 83 64 20 50 91 93 208 43 45 100 57 M5 1 3 8 5 8 10 7 10 12
GC-65 3 550 7 100 6 700 8,7 0,022 148 250 105 83 20 65 131 136 316 50 65 150 74 M6 1 6 16 15 20 24 20 26 32
GC-75 6 100 12 200 5 200 13 0,044 169 250 126 100 20 75 151 156 316 62 75 150 88 M8 1 6 16 13 18 22 18 23 28
GC-100 13 600 27 200 4 200 25 0,139 209 300 162 135 30 100 171 176 316 76 85 150 120 M10 1 6 16 12 17 21 18 23 28
GC-120 18 900 37 800 3 600 37 0,270 233 300 186 160 40 120 211 216 416 90 105 200 144 M10 1 6 16 17 24 31 24 34 44
GC-135 25 300 50 600 3 250 47 0,380 254 300 204 175 40 135 231 236 418 100 115 200 156 M12 1 6 18 15 24 33 24 44 64
GC-150 35 500 71 000 2 800 70 0,868 308 400 246 200 50 150 241 246 618 105 120 300 172 M16 1 6 18 20 27 33 24 44 64
GC-165 38 600 77 200 2 600 103 1,50 336 500 262 220 60 165 301 310 628 120 150 300 196 M16 1 10 28 52 58 63 58 83 108
GC-190 78 000 156 000 2 200 147 2,72 366 500 303 255 80 190 341 350 828 150 170 400 228 M20 1 10 28 36 47 58 58 83 108
GC-220 110 600 221 200 1 950 215 5,32 428 600 345 290 80 220 401 410 828 175 200 400 246 M20 1 10 28 33 50 66 64 94 124
GC-240 156 000 312 000 1 750 324 9,68 458 600 394 320 80 240 463 476 844 190 230 400 284 M20 3 16 44 86 99 111 155 170 185
GC-270 186 000 372 000 1 600 415 14,9 490 600 436 360 120 270 503 516 844 220 250 400 314 M24 3 16 44 81 94 106 148 162 176
GC-285 219 000 438 000 1 450 540 23,7 534 800 474 380 120 285 563 576 844 250 280 400 330 M24 3 16 44 111 121 131 198 213 228
GC-330 250 500 501 000 1 300 717 36,8 580 800 518 431 160 330 603 616 844 280 300 400 390 M30 3 16 44 91 101 111 158 173 188
GC-365 345 000 690 000 1 150 927 61,0 668 800 586 480 180 365 705 730 858 325 350 400 422 M30 5 30 58 124 137 150 216 233 250
GC-400 470 000 940 000 1 050 1 299 102 730 1000 642 530 200 400 805 830 358 345 400 150 478 M30 5 30 58 112 131 150 192 213 234
GC-450 661 000 1 322 000 950 1 712 172 830 1000 720 621 200 450 805 830 358 400 400 150 560 M30 5 30 58 112 131 150 192 213 234
GC-500 790 000 1 580 000 900 2 214 252 882 1000 742 651 200 500 905 930 1058 410 450 500 600 M30 5 30 58 122 141 160 210 230 250
GC-600 1 250 000 2 500 000 775 3 242 488 970 1000 867 761 300 600 1005 1030 1070 470 500 500 680 M30 5 30 70 131 151 170 230 250 270
GC-700 2 150 000 4 300 000 650 6 054 1358 1 220 2000 1064 921 300 700 1405 1440 1710 580 700 800 830 M42 5 40 110
GC-800 3 600 000 7 200 000 550 9 014 2744 1 440 2000 1240 1061 300 800 1405 1440 1710 600 700 800 920 M48 5 40 110
GC-900 5 300 000 10 600 000 475 11 866 4574 1 600 2000 1416 1190 400 900 1505 1540 1710 680 750 800 1100 M48 5 40 110
GC-1000 8 000 000 16 000 000 425 13 500 6691 1 814 2000 1630 1350 500 1000 1660 1700 2380 740 800 1100 1160 M48 60 100 180
Lmin & Lmax dimensions given for nominal hub length Ln
Axial stroke can be calculated from S values: Smax - Smin = Stroke
Mass moment of inertia J is given for maximum bore diameter
Mass M is given for average bore diameter (Dmin + Dmax /2)
Maximum rotation speed nmax is given for a grease lubricated coupling without dynamic balancing Updated
Type
GC-Coupling Dimensions
Small sizes GC-50 - GC-220 Large sizes GC-240 - GC-600
mm
XLarge sizes GC-700 - GC-1000
07.05.2018 11:52
SSizes
T1, 1 hub turned
T2, 2 hubs turned
LSizesXLSizes

6. GCHD MODELS
SUURETEHO KYTKIMET
Tnom Tmax nmax M J D Dmax Dh Dn D1/D2min D1/D2max Lmin L Lmax Lnmin Ln1/Ln2 Lnmax Dph M Smin S Smax S1min S1 S1max S2min S2 S2max
Nm Nm 1/min kg Kgm2
GCHD-240 280 000 560 000 1 750 324 9,68 458 600 394 320 80 240 463 476 844 190 230 400 284 M20 3 16 44 86 99 111 155 170 185
GCHD-270 340 000 680 000 1 600 415 14,9 490 600 436 360 120 270 503 516 844 220 250 400 314 M24 3 16 44 81 94 106 148 162 176
GCHD-285 410 000 820 000 1 450 540 23,7 534 800 474 380 120 285 563 576 844 250 280 400 330 M24 3 16 44 111 121 131 198 213 228
GCHD-330 510 000 1 020 000 1 300 717 36,8 580 800 518 431 160 330 603 616 844 280 300 400 390 M24 3 16 44 91 101 111 158 173 188
GCHD-365 680 000 1 360 000 1 150 927 61,0 668 800 586 480 180 365 705 730 858 325 350 400 422 M30 5 30 58 124 137 150 216 233 250
GCHD-400 865 000 1 730 000 1 050 1 299 102 730 1000 642 530 200 400 805 830 958 345 400 450 478 M30 5 30 58 112 131 150 192 213 234
GCHD-425 1 100 000 2 200 000 1 000 1 589 108 760 1000 694 580 200 425 805 830 958 400 400 450 520 M30 5 30 58 112 131 150 192 213 234
GCHD-450 1 280 000 2 560 000 950 1 712 172 830 1000 720 621 200 450 805 830 958 400 400 450 560 M30 5 30 58 112 131 150 192 213 234
GCHD-500 1 685 000 3 370 000 900 2 214 252 882 1000 742 651 200 500 905 930 1058 410 450 500 600 M30 5 30 58 122 141 160 210 230 250
GCHD-600 2 500 000 5 000 000 775 3 242 488 970 1000 867 761 300 600 1005 1030 1070 470 500 500 680 M30 5 30 70 131 151 170 230 250 270
Lmin & Lmax dimensions given for nominal hub length Ln
Axial stroke can be calculated from S values: Smax - Smin = Stroke
Mass moment of inertia J is given for average bore diameter (Dmin + Dmax /2)
Mass M is given for average bore diameter (Dmin + Dmax /2)
Maximum rotation speed nmax is given for a grease lubricated coupling without dynamic balancing Updated
Type
mm
GCHD-Coupling Dimensions
Small sizes GC-50 - GC-220 Large sizes GC-240 - GC-600 XLarge sizes GC-700 - GC-1000
LSizes
07.05.2018 11:52
T1, 1 hub turned
T2, 2 hubs turned

7. Standard materials:
Hub: 42CrMo4 QT EN 10083
Sleeve: EN-GJS-800-2 / E470 /
42CrMo4 QT EN 10083
Seal Plates: S235 EN 10025
Spacers & other parts: S355 EN 10025
Available special materials:
AISI304 / AISI316 / AISI410 (GCRST)
34CrNiMo6 (GCHD)
GC couplings come standard without any surface treatment.
Available treatments include:
Painting (Hubs are not painted, spacers are painted
RAL1021 as standard)
Bluing and Parkerizing
Anodizing (GCAL only)
Zink plating
Available heat treatments:
Nitriding
Induction hardening
Carburizing
GC MATERIALS

8. GC SEALS
Available sealing materials:
NBR70 (standard), -20 °c - +120 °c
FPM70, -18 °c - +220 °c
EPDM, -45 °c - +130 °c
PTFE coated silicone, -40 °c - +205 °c
The maximum allowed angular misalignment is limited by the
seals. Special seals may be used to achieve high angular
misalignment capacity.
A sealing compound, such as Loctite 510, is recommended to
seal the flange connection between the the sleeves.
Oil lubricated couplings are supplied with special seals or without
any seals.
Seal construction:
GC-50 – GC-220: 1 piece sleeve
GC-240 – GC-600: Separate seal flanges
GC-700 – GC-1000: Separate seal flanges,
Special lip seals

9. Taulukko 2: Kiristysmomentit
HARDWARE
Only DIN standard hardware is used in GC
couplings.
All hardware should be grade 8.8 or higher.
The flange connection between the outer
sleeves is achieved with fitted screws and
metal lock nuts, which also center the sleeves
together.
Standard hardware is either zinc plated or
parkerized. Special hardware, such as
stainless steel, is available on request.
All screws should be torqued according to
table.
Table: Tightening Torques
Hardware of lower
grade than the originals
should not be used.

10. SHAFT ATTACHEMENTS
The most common attachment is a straight, fitted bore
and a keyway.
GC couplings are available with a variety of attachments:
– Bore & keyway or multiple keyways
– locking devices and shrink discs
– Bore with oil release grooves
– Conical bore
– DIN5480 spline
– Form shafts, such as rectangular
– Flange connections
Hub and shaft fit is always chosen according to customer
demand. H7/m6 or J7/m6 is recommended for most
applications.
The necessary attachment may serve as the sizing base
for the entire coupling, large shaft with a low torque, for
example.

11. LUBRICATION
If the available lubricant is not listed,
it’s up to the user to make sure it has
EP additivies and an NLGI class of 0,
00 or 1.
Temperature, operatin speed and load
all affect the type of lubricant. If in
doubt, consult the lubricant
manufacturer to determine the best
lubricant for your drive.
An incorrect
lubricant grade or
quantity will lead to
premature wear of
the teeth
Greases and oils
should not be
mixed

12. MISALIGNMENTS
Alignment precision requirements for special
versions can be found in the assembly
drawing of the coupling.
Values listed in table 4 are valid for a coupling
in normal use, rotating at max. 1500 1/min.
Radial misalignment X is given at the
maximum allowed angular misalignment and
according to the shortest value S listed in
table 1.
Maximum tooth backlash for each coupling is
listed in table 5.
The relationship between angular
misalignment, rotating speed and torque
transfer capacity is give in graph 1. The
values are approximate.
Type α X
GC-50 1,0 ⁰ 0,45
GC-65 1,0 ⁰ 0,69
GC-75 1,0 ⁰ 0,76
GC-100 1,0 ⁰ 0,84
GC-120 1,0 ⁰ 1,10
GC-135 1,0 ⁰ 1,23
GC-150 1,0 ⁰ 1,23
GC-165 1,0 ⁰ 1,73
GC-190 1,0 ⁰ 1,85
GC-220 1,0 ⁰ 2,27
GC-240 1,0 ⁰ 2,73
GC-270 1,0 ⁰ 2,92
GC-285 1,0 ⁰ 3,43
GC-330 1,0 ⁰ 3,61
GC-365 1,0 ⁰ 4,19
GC-400 1,5 ⁰ 6,68
GC-450 1,5 ⁰ 6,68
GC-500 1,5 ⁰ 7,46
GC-600 1,5 ⁰ 8,25
GC-700 2,0 ⁰ 9,00
GC-800 2,0 ⁰ 9,00
GC-900 2,0 ⁰ 9,00
GC-1000 1,5 ⁰ 9,00
Max. Deviations
Table 4:Maximum backlash Table 5: Maximum misalignments
Type Max. Backlash
GC-50 0,45
GC-65 0,45
GC-75 0,45
GC-100 0,51
GC-120 0,51
GC-135 0,51
GC-150 0,68
GC-165 0,68
GC-190 0,85
GC-220 0,85
GC-240 1,00
GC-270 1,00
GC-285 1,15
GC-330 1,39
GC-365 1,42
GC-400 1,62
GC-450 1,62
GC-500 1,62
GC-600 1,62
GC-700 1,62
GC-800 2,12
GC-900 2,12
GC-1000 2,56
Max. Backlash

13. General installation instructions:
- Align the coupled machines according to the values listed
in table 3.
- Clean the outside of the coupling.
- Measure the shaft and the coupling bore to check the fit.
- Heat the hub to max. 130 ⁰C if required, and cool the shaft
with liquid nitrogen.
- Slide the end flange and sleeve on to the shaft without the
seals before the hub.
- Install the hub on to the shaft and let it cool before installing
the seals.
- Seal the keyway on the end of the hub with a proper
sealing lacquer or paste.
- Pre-lubricate the teeth and install the sleeve on to the hub.
- Seal the flange connection between the sleeves with a
proper sealing lacquer.
- Connect the flanges together with the hardware supplied
with the coupling and tighten them according to table 2.
- Lubricate the coupling by opening at least one fill plug and
filling the coupling with grease through the other plug.
- Double check screw tightness and install the coupling
cover (Cover sold separately).
INSTALLATION
Angular misalignment
after alignment should
be at lease 0.01⁰ to
maintain best possible
tooth contact
Large angual
misalignment can
cause axial forces due
to sliding in the teeth.
An incorrectly
tightened screw may
come loose and
damage the coupling
or other parts of the
drive.
Altering the coupling
by machining or
welding is strictly
prohibited.
Inaccurate alignment
will lead to premature
coupling failure.
Locking hardware,
such as lock nuts,
should be replaced if
removed.

14. INSPECTION & MAINTENANCE
Water must not be
used to clean the
coupling.
Inspection and maintenance:
– Clean the coupling before disassembly with a suitable
solvent.
– Disassemble the coupling so that the teeth can be inspected.
Clean the inside.
– Check tooth backlash by hand. If a considerable amount of
backlash can be felt, measure it with a thickness gauge and
compare the values to table 5.
– Replace the seals and hardware if required.
– Parts with visible wear (pitting, bad scuffing, wear, rust, etc.)
should be replaced.
– Pre-lubricate the teeth, assemble the coupling and fill it with
grease.
Changing the lubricant:
– Rotate the coupling so that the fill plugs are horizontal.
– Open at least two fill plugs.
– Flush the coupling with an alcohol based solvent through the
other fill plug and let the solvent drain from the other plug.
– Fill the coupling by closing the other fill plug and filling it
through the other plug.
Service intervals for GC couplings:
Normal use:
– Change lubricant 3000h / 1,5v
– Disassemble & Inspect 12000h / 3v
Heavy use:
– Change lubricant 1500h / 1v
– Disassemble & Inspect 8000h / 2v

15. Warranty terms for GC couplings:
– The customer has provided MFG with adequate data of the drive.
– Screw tightening torques, grease type and quantity and alignment
precision has been documented during installation.
– The coupling has been installed in the drive it was first designated
for, and the drive has not been altered after designation.
– Only fasteners and seals supplied with the coupling have been
used.
– The coupling has been properly filled with a grease recommended
by MFG while taking note of the ambient temperature.
– The coupling has not been damaged during installation by excess
heat or by damaging it.
– The coupling has been stored appropriately, away from solvents
and other chemicals.
– The customer has not altered the coupling by machining, welding,
etc.
Indirect expenses
caused by replacing
the coupling are not
covered.
GENERAL WARRANTY TERMS

16. MISALIGNMENTS - ANGULAR
Given values are
approximate
Graph 1: Relation between torque transfer and angular misalignment, factored by rotation speed

17. Graph 2: Spacer length vs. maximum rotation speed
MISALIGNMENTS – GCX SPACERS
Given values are
approximate

18. INTERMEDIATE SHAFT, TYPICAL CONSTRUCTION

19. SOME TAILORED DESIGNS

20. DROP IN REPLACEMENTS
2. We do desing the
coupling required and do
check the sizing and the
strenght.
1. Starting point;
30 years old
coupling in a
paper mill.
Information
needed:
Applivation,
torque, rpm,
DBSE, shaft data
and enviroment.
3. Manufacturing is done
based on order in
Tohmajärvi workshop.
Intermediate shafts we do
produce in our Kortka
workshop.
4. Documentations and
shipping to the
customer. Assembly or
assembly supervision
by our partners when
needed.

21. SOME GC REFERENCES
Pulp and paper industry:
• Andritz
• Estonian Cell
• Stora Enso
• Mondi
• Valmet Technology
Steel mills:
• Outokumpu Stainless
• SSAB
Proces industry:
• Flowrox
• ABB Drives
• Andritz Service
• The Switch
• BioCone
Gear manufacturers:
• DB Santasalo Gears
• SEW
• Katsa
• Desch GmbH
Moving equipment:
• Kesla
Kaivosteollisuus:
• Outokumpu
• Kevitsa Mine
• Terrafame Mine

22. SOME DELIVERIES DURING THE YEARS…

23. THE FAMILY
GEAR COUPLINGS DISC PACK
COUPLINGS
CLAMP
COUPLINGS
SHEAR PIN
COUPLINGS
CLAW COUPLING
PRESENTED 2018
PIN COUPLINGS SPECIAL ONES

24. COMPANY DATA
Power Tech Group Oy was established 1983 in a city of Kotka, South
Coast of Finland. It is a private company, main owner is Kalle Sundberg.
Kaarniemi workshop, Kotka, is the head office of the company and there
is some 6000m2 of manufacturing space and 80+ persons working daily.
• Turning up to 5 m dia and milling, 3D measuring machine, plate
work and welding. Max 20 mt pieces.
Hietanen assembly hall, Kotka, has 3500m2 and some 10 persons
working daily.
• Painting, assembly, storing. Max 50 mt.
Savonlinna workshop has 1500 m2 and some 10 persons working daily.
Max 20 mt
• Milling up to 14 m lenght and 4.5 m working area.
Tohmajärvi workshop, has 4000 m2 and 40+ persons working daily
• Turning, milling, gearing up to 1 m dia and assembly. Max 2 mt
• Engineering and own power transmission products
Total 140+ persons, annual turnover 20+ M€
Mostly contract manufactring of components and ready made
machinery.
PTG GC couplings 7.5.2018