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Disc Couplings High Flexible, Double Disc (GCPWWK20-8-8)

On Sale Till 31/03/2025
Volume Discount

Check FAQ of this product (5 items)

MISUMI

MiSUMi Economy

MISUMI

· GCPSW Model Disc Couplings High Flexible, Double Disc.
· Body material: Aluminum alloy with Alumite Treatment surface.
· Spacer disc material is Stainless steel with
· Fastening Bolt, Set Screw: Steel SCM435.
· Fastening surface treatment with Ferro ferric Oxide Protective Film.
· Shaft Fastening Method: Lock bolt clamp and screw type.
· GCPSW Model Body size: 20 to 39.
· Allowable Angular misalignment 2 degree.
· Maximum Rotational Speed: 10,000 (r/min).
· Maximum Rotational Speed Range: 4001 ~ 10000 (r/min).
· Application : For Servo Motors / Stepping Motor.

Part Number

Configured Part Number is shown.

GCPWWK20-8-8

Drawing/Specifications
3D Preview
Part Numbers

Economy High Flexible Double Disc Coupling

High flexibilityZero backlashDouble disc

- Exceptional flexibility for compensating axial, radial, and angular misalignments

- High transmission efficiency up to specified percentage.

- Suitable for high-speed applications with a maximum rotational speed up to specified RPM

- Lightweight and compact design allows for easy installation

- Ideal for medium to high power transmission

Economy High Flexible Double Disc Coupling

MISUMI Standard

Cheaper Price

Product Variety

3D CAD
3D CAD Support

Coupling Product Overview

The disc Coupling is composed of several groups of discs (stainless steel thin plates) that are interlaced with two halves of the Coupling with bolts, and each group of discs is formed by stacking several pieces.
The disc Coupling relies on the elastic deformation of the disc to compensate for the relative displacement of the connected two shafts, which is a high-performance flexible Coupling with strong metal components.
It is characterized by compact structure, no backlash, high strength, long service life, no rotation clearance, no influence of temperature and oil pollution, acid resistance, alkali resistance and corrosion resistance.
Applicable motor types: recommended for servo motors, stepping motors and general motors.

Coupling Product Feature

■ Main characteristics of disc Coupling
1. Strong ability to compensate for misalignment between two axes. Compared with tooth Coupling, angular displacement can be doubled. In case of radial displacement, reaction force is small, flexibility is large, and certain axial, radial and angular displacements are allowed.
2. It has obvious shock absorption, no noise and no wear.
3. Suitable for working in high temperature (-80+300) and harsh environment, and operate safely under shock and vibration conditions.
4. High transmission efficiency, up to 99.86%. Especially suitable for medium, high speed and high power transmission.
5. Simple structure, light weight, small in size and convenient assembly and disassembly. It can be assembled and disassembled without moving the machine (models with intermediate shaft), and requiring no lubrication.
6. It can accurately transmit the rotational speed without slip, and can be used for transmission of precision machinery

Dimensional Coupling Drawing

Universal type with excellent flexibility. The price is the lowest among MISUMI diaphragm Couplings suitable for servo motors.
Dimensional drawing of disc Coupling

TYPE				Material			Surface Treatment		Accessories
Standard Hole	d1 (One side)	d2 (One side)	d1, d2 (Both sides)	Body	Disc	Fastening Bolt, Set Screw	Body	Fastening Bolt, Set Screw
GCPW	GCPWLK	GCPWRK	GCPWWK	Aluminum	Stainless Steel	SCM435	Alumite Treatment	Ferroferric Oxide Protective Film	Fastening Bolt
GCPSW	GCPSWLK	GCPSWRK	GCPSWWK						Set Screw

Coupling Specifications Overview

Specification Table
Please order after selecting part number and parameters according to the selection steps

. Please specify the shaft bore dia. within the range of d_1≤d₂.

Part Number (Type·D)	－	d₁	－	d₂
GCPW29	－	10	－	14

Part Number			d₁, d₂ selection (But d₁≤d₂)												d₃	L	R	F₁	F₂	A	Fastening Bolt		Set Screw
Type		D																			M	Tightening Torque	M	Tightening Torque
Type		D																			M	(N·m)	M	(N·m)
Clamping type GCPW GCPWLK GCPWRK GCPWWK	Set Screw type GCPSW GCPSWLK GCPSWRK GCPSWWK	20	＊4	＊5	6	6.35	8								8.5	28.8	11	3.5	5.5	6.4	M2.5	1.0	M3	0.7
		26		＊5	6	6.35	8	10	11						11.5	34.1	11.9	3.5	5.5	9			M3	0.7
		29		＊5	6	6.35	8	10	11	12	14				14.5	34.3	11.9	3.5	5.5	10.5			M4	1.7
		33			6		8	10	11	12	14	15	16		16.5	40	13	4	6.5	12	M3	1.5	M4	1.7
		39					8	10	11	12	14	15	16	18	19	49.4	16	4.75	8	14	M4	3.5	M5	4.0

d₁ and d₂＊marked products without keyway hole.

■Characteristic Value

Part Number			Allowable torque (N·m)	Allowable angle (°)	Allowable lateral misalignment (mm)	Static torsional rigidity (N·m/rad)	Maximum speed (r/min)	Moment of inertia (kg·m²)	Allowable axial amplitude (mm)	Compensation coefficient	Weight (g)
Type		D	Allowable torque (N·m)	Allowable angle (°)	Allowable lateral misalignment (mm)	Static torsional rigidity (N·m/rad)	Maximum speed (r/min)	Moment of inertia (kg·m²)	Allowable axial amplitude (mm)	Compensation coefficient	GCPW	GCPSW
GCPW GCPWLK GCPWRK GCPWWK	GCPSW GCPSWLK GCPSWRK GCPSWWK	20	1	2	0.1	550	10000	1.1×10^－6	±0.20	2	19	19
		26	2		0.15	700		3.3×10^－6	±0.20		31	33
		29	3		0.15	1200		5.5×10^－6	±0.30		43	44
		33	5		0.2	1500		1.1×10^－5	±0.40		60	65
		39	8		0.25	3350		2.7×10^－5	±0.50		113	118

Static torsional stiffness, moment of inertia and weight are the values at the maximum shaft dia..

■Shaft slip torque (N·m)

When the shaft slip torque is less than the allowable torque, please use it below the shaft slip torque.

Part Number			d₁, d₂
Type		D	4	5	6	6.35	8	10	11	12	14	15	16	18
GCPW GCPWLK GCPWRK GCPWWK	GCPSW GCPSWLK GCPSWRK GCPSWWK	20	1.0	1.0	1.0	1.0	1.0	－	－	－	－	－	－	－
		26	－	1.0	1.5	2.0	2.0	2.0	2.0	－	－	－	－	－
		29	－	1.0	1.5	2.0	2.5	2.5	3.0	3.0	3.0	－	－	－
		33	－	－	2.5	－	2.5	3.5	3.5	4.0	5.0	5.0	5.0	－
		39	－	－	－	－	5.5	8.0	8.0	8.0	8.0	8.0	8.0	8.0

Coupling Precautions

■ Calibration and adjustment
1. The Coupling allows axis deviation, and transmits rotation angle and torque, but when the axis deviation exceeds the allowable value, vibration will occur or the service life will be drastically reduced.
Be sure to make calibration and adjustment.
2. Axis deviation includes lateral misalignment (parallel error of two axes), angular misalignment (angular error of two axes) and axial amplitude (axial movement of shaft).
Please calibrate and adjust the shaft to ensure that the axis deviation is below the allowable value recorded in the dimension and performance table of each product.
3. The allowable value of axis deviation recorded in the dimension and performance table refers to the situation when either lateral misalignment, angular misalignment or axial amplitude occurs alone. When more than two axis deviations occur at the same time, the corresponding allowable values are halved respectively.
4. Axis deviation not only occurs when assembling to the device, but also is caused by vibration, thermal expansion and bearing wear in operation. Therefore, it is recommended to set the axis deviation below 1/3 of the allowable value.

Example of Use Coupling


Use example of Coupling 1: motor × gear box	Use example of Coupling 2: motor × ball screw


Use example of Coupling 3: motor × encoder	Use example of Coupling 4: motor × measuring tester

Coupling Usage Method

■Mounting method
STEP1 Insert the Coupling
Confirm that the clamping bolt has been unscrewed, and then remove the dust, foreign matter and oil from the shaft and Coupling bore.
Then, when inserting the Coupling into the shaft, please be careful not to put the disc under excessive stress such as compression or tension.
STEP2 Use fixture to adjust
Please use fixture to adjust and fix the concentricity of the left and right hubs of the Coupling with high accuracy.
STEP3 Simple lateral misalignment and angular misalignment confirmation
Under the condition of unscrewed bolts, make the Coupling slide axially and confirm its smooth movement.
Then, rotate the Coupling to make sure it moves smoothly.
Lateral misalignment is not allowed for single disc type Coupling, so carry out positioning securely.
Simple lateral misalignment confirmation

Simple lateral misalignment confirmation

Simple angular misalignment confirmation

STEP4 Installation
Please adjust the shaft insertion amount according to the dimension ℓ in the product catalog, and use a torque wrench to tighten with the specified torque.
＊ If the specified torque cannot be reached once, please cross fasten the left and right clamps twice or three times.

Part Number

CAD Data download and 3D preview are not available because the part number has not yet been determined.

*In order to open the CAD Data download and 3D preview screen, the part number must be fixed.
Please confirm the part number from "Specification / Dimension"on the left side, and then perform the CAD Data Download / 3D Preview operation.

CAD Download

: 30; 45; 60

Part Number
GCPWWK20-8-8

Part Number	Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Shaft Bore Dia. 1 d1 (or d) (Ø)	Shaft Bore Dia. 2 d2 (or d) (Ø)	O.D. (Ø)	Overall Length (mm)	Allowable Torque Range (N•m)	Features	Allowable Torque (N•m)	Allowable Lateral Misalignment (mm)	Allowable Lateral Misalignment Range (mm)	Allowable Axial Misalignment (mm)	Moment of Inertia (kg･m²)	Shaft Bore Shape	Shaft Tightening Method
	SGD 28.49	1 Piece(s)	Available	Same day	8	8	20	28.8	0.05~1.00	High Torque Type / Zero Backlash	1	0.1	0.02~0.2	0.2	1.1×10^-6	Keywayed Bore (d1/d2 Side)	Fastening Bolt

Basic Information

Series Name	Disc	Application	For Servo Motors / Stepping Motor	Allowable Misalignment	Angular Misalignment / Eccentricity / Axial Misalignment
Max. Rotational Speed Range(r/min)	4001~10000	Body Material	Aluminum Alloy	Allowable Angular Misalignment(deg)	2
Product Category	Coupling Main Body	Max. Rotational Speed(r/min)	10000	Disc Material	Stainless Steel
Single/Double	Double

Please check the type/dimensions/specifications of the part GCPWWK20-8-8 in the Disc Couplings High Flexible, Double Disc series.

Configure

1 Part Numbers

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Configure Remaining Specifications

Completed

Specification/Dimensions

Features
High Torsional Rigidity

High Torque Type

Zero Backlash
Clear
type
- GCPSW
- GCPSWLK
- GCPW
- GCPWRK
- GCPWWK
Clear
Shaft Bore Dia. 1 d1 (or d)(Ø)
4

5

6

6.35

8

10

12

14

15
Clear
Shaft Bore Dia. 2 d2 (or d)(Ø)
5

6

6.35

8

10

11

12

14

15

16

18
Clear
O.D.(Ø)
20

26

29

33

39
Clear
Overall Length(mm)
28.8

34.1

34.3

40

49.4
Clear
Allowable Torque Range(N•m)
0.05~1.00

1.01~3.00

3.01~5.00

5.01~10.00
Clear
Allowable Torque(N•m)
1

2

3

5

8
Clear
Allowable Lateral Misalignment(mm)
0.1

0.15

0.2

0.25
Clear
Allowable Lateral Misalignment Range(mm)
0.02~0.2

0.21~0.40
Clear
Shaft Bore Shape
Keywayed Bore (d1 Side)

Keywayed Bore (d1/d2 Side)

Keywayed Bore (d2 Side)

Standard Bore
Clear
Shaft Tightening Method
- Fastening Bolt
- Set Screw
Clear
CAD
- 2D
- 3D
Clear

Days to Ship

All

Same day
Clear

Specify Alterations

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently asked question (FAQ)

Question: Which disc type coupling is better, single disc type or double disc type?: Answer: Double disc type can absorb angular misalignment and lateral misalignment, but the total length will increase.
Although the total length of the single disc type is short, it is only suitable for applications with narrow space because lateral misalignment is not allowed in the structure.
Special attention should be paid to centering during use.
Question: Abnormal sound or vibration occurs during use of disc type coupling.: Answer: When a servo motor is used, the frequency of the mechanical resonance suppression filter is set as its inherent vibration frequency in the control system to suppress sound and vibration.
When using a stepping motor, the rotational speed can be finely adjusted, or the vibration can be absorbed and suppressed by the high damping rubber type coupling with obvious attenuation effect.
Question: How to select according to the purpose, environment, working conditions?: Answer: Please refer to the MISUMI website.
Question: What is a coupling?: Answer: A coupling is a part that connects two different rotating bodies (motor shaft, ball screw, etc.) and aims at transmitting torque. The load of assembly adjustment is reduced by absorbing the axis deviation (lateral misalignment, angular misalignment and axial amplitude) between rotating bodies. And in case of accidental overload, the coupling is destroyed and the rotating bodies are disconnected to protect the expensive power part and the whole device.
Question: The coupling is damaged in use.: Answer: Whether it is within the allowable axis deviation during use
Please note that when multiple axis deviations occur at the same time, their allowable values are reduced to 1/2 of that described in the product catalog.

Check other FAQ (2 items) Hide

Similar Part Numbers

Part Number
GCPSW33-15-15
GCPSW33-6-8
GCPSW39-12-12
GCPWWK29-10-14
GCPWWK33-10-14
GCPWWK33-12-14

Standard Unit Price	Minimum order quantity	Volume Discount	Days to Ship	Shaft Bore Dia. 1 d1 (or d) (Ø)	Shaft Bore Dia. 2 d2 (or d) (Ø)	O.D. (Ø)	Overall Length (mm)	Allowable Torque Range (N•m)	Features	Allowable Torque (N•m)	Allowable Lateral Misalignment (mm)	Allowable Lateral Misalignment Range (mm)	Allowable Axial Misalignment (mm)	Moment of Inertia (kg･m²)	Shaft Bore Shape	Shaft Tightening Method
SGD 30.24	1 Piece(s)	Available	Same day	15	15	33	40	3.01~5.00	High Torque Type / Zero Backlash	5	0.2	0.02~0.2	0.4	1.1×10^-5	Standard Bore	Set Screw
SGD 30.33	1 Piece(s)	Available	Same day	6	8	33	40	3.01~5.00	High Torque Type / Zero Backlash	5	0.2	0.02~0.2	0.4	1.1×10^-5	Standard Bore	Set Screw
SGD 33.76	1 Piece(s)	Available	Same day	12	12	39	49.4	5.01~10.00	High Torque Type / Zero Backlash	8	0.25	0.21~0.40	0.5	2.7×10^-5	Standard Bore	Set Screw
SGD 33.40	1 Piece(s)	Available	Same day	10	14	29	34.3	1.01~3.00	High Torque Type / Zero Backlash	3	0.15	0.02~0.2	0.3	5.5×10^-6	Keywayed Bore (d1/d2 Side)	Fastening Bolt
SGD 35.51	1 Piece(s)	Available	Same day	10	14	33	40	3.01~5.00	High Torque Type / Zero Backlash	5	0.2	0.02~0.2	0.4	1.1×10^-5	Keywayed Bore (d1/d2 Side)	Fastening Bolt
SGD 35.53	1 Piece(s)	Available	Same day	12	14	33	40	3.01~5.00	High Torque Type / Zero Backlash	5	0.2	0.02~0.2	0.4	1.1×10^-5	Keywayed Bore (d1/d2 Side)	Fastening Bolt

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Disc Couplings High Flexible, Double Disc (GCPWWK20-8-8)

Economy High Flexible Double Disc Coupling

Coupling Product Overview

Coupling Product Feature

Dimensional Coupling Drawing

Coupling Specifications Overview

Coupling Precautions

Example of Use Coupling

Coupling Usage Method

Part Number

Basic Information

Configure

Specification/Dimensions

Features

type

Shaft Bore Dia. 1 d1 (or d)(Ø)

Shaft Bore Dia. 2 d2 (or d)(Ø)

O.D.(Ø)

Overall Length(mm)

Allowable Torque Range(N•m)

Allowable Torque(N•m)

Allowable Lateral Misalignment(mm)

Allowable Lateral Misalignment Range(mm)

Shaft Bore Shape

Shaft Tightening Method

CAD

Days to Ship

Specify Alterations

Frequently asked question (FAQ)

Similar Part Numbers

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