XBWS-C

Flexible Couplings - Disk Type - Clamping Type

RoHS Compliant

Zero Backlash
High torsional rigidity
High Torque

XBWS-C_C（NBK2.0用にXBW-Cを消去したもの）Flexible Couplings - Disk Type

Dimension Drawing
Specs/CAD
Structure
Material/Finish
Characteristics

Dimension Drawing

Specs/CAD

Unit : mm

Part Number	A	L	W	E	F	G	M	Screw Tightening Torque (N・m)	Standard Bore Diameter D₁-D₂	CAD	RFQ
XBWS-15C2A	15	7.5	22	6.1	2.3	5.25	M2	0.5	-	CAD	RFQ
XBWS-19C2A	19	9	25.5	8.5	2.5	7.1	M2	0.5	-	CAD	RFQ
XBWS-25C2A	25	11	32.2	12.5	3.5	9.25	M2.5	1	-	CAD	RFQ
XBWS-27C2A	27	11	32.2	14.5	3.5	10.25	M2.5	1	-	CAD	RFQ
XBWS-34C3A	34	12	37.4	16.5	4	13	M3	1.5	-	CAD	RFQ
XBWS-39C2A	39	15	46.6	20.5	5	14.5	M4	3.5	-	CAD	RFQ
XBWS-44C2A	44	15	46.6	23	5	17	M4	3.5	-	CAD	RFQ
XBWS-56C3A	56	20	60.4	29	6	21.25	M5	8	-	CAD	RFQ

All products are provided with hex socket head cap screw.
Recommended tolerance for shaft diameters is h6 and h7.
In case of mounting on D-cut shaft, be careful about the position of the D-cut surface of the shaft. ⇒Mounting and Maintenance

Part Number	Max. Bore Diameter (mm)	Rated Torque^＊1 (N・m)	Max. Rotational Frequency (min^-1)	Moment of Inertia (kg・m²)^＊2	Static Torsional Stiffness (N･m/rad)	Max. Lateral Misalignment (mm)	Max. Angular Misalignment (°)	Max. Axial Misalignment (mm)	Mass (g) ^＊2
XBWS-15C2A	6	0.42	42000	5.0×10-7	300	0.05	1	±0.2	20
XBWS-19C2A	8	0.6	33000	1.6×10-6	550	0.15	2	±0.2	38
XBWS-25C2A	12	1.1	25000	6.1×10-6	1100	0.2	2	±0.4	71
XBWS-27C2A	14	1.3	23000	8.2×10-6	1300	0.2	2	±0.4	88
XBWS-34C3A	16	2.5	18000	2.5×10-5	1800	0.25	2	±0.6	160
XBWS-39C2A	20	4.8	16000	5.1×10-5	3500	0.3	2	±0.6	260
XBWS-44C2A	22	5.6	14000	8.9×10-5	5500	0.3	2	±0.6	400
XBWS-56C3A	28	14	11000	2.9×10-4	10000	0.3	2	±0.8	800

＊1：　Correction of rated torque due to load fluctuation is not required. For more detailed information, please refer to Selection Guidelines.

※ The shaft's slip torque may be smaller than the coupling's rated torque depending on the shaft bore. XBW-C

＊2：　These are values with max. bore diameter.

Part Number	Standard Bore Diameter D₁･D₂
Part Number	3	4	5	6	8	10	11	12	14	15	16	18	19	20	22	24	25	28
XBWS-15C2A	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-27C2A	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-34C3A	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-39C2A	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-44C2A	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	-	-	-
XBWS-56C3A	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●

● All products are provided with hex socket head cap screw.
● Recommended tolerance for shaft diameters is h6 and h7.
● Bore and keyway modifications are available on request. Please take advantage of our modification services.

Part Number	Standard Bore Diameter D₁･D₂
Part Number	3	4	5	6	8	10	11	12	14	15	16	18	19	20	22	24	25	28
XBWS-15C2A-3-3	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-3-4	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-3-5	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-3-6	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-4-4	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-4-5	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-4-6	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-5-5	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-5-6	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-15C2A-6-6	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-4-4	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-4-5	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-4-6	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-4-8	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-5-5	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-5-6	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-5-8	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-6-6	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-6-8	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-19C2A-8-8	-	●	●	●	●	-	-	-	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-5-5	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-5-6	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-5-8	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-5-10	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-5-11	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-5-12	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-6-6	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-6-8	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
XBWS-25C2A-6-10	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-	-
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XBWS-27C2A-6-6	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
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XBWS-27C2A-10-11	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-27C2A-10-12	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-27C2A-10-14	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-27C2A-11-11	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
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XBWS-27C2A-12-12	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-27C2A-12-14	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-27C2A-14-14	-	-	-	●	●	●	●	●	●	-	-	-	-	-	-	-	-	-
XBWS-34C3A-6-6	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-8	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-10	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-11	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-12	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-14	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-6-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-8	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-10	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-11	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-12	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-14	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-8-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-10-10	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-10-11	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-10-12	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-10-14	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-10-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-10-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-11-11	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-11-12	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-11-14	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-11-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-11-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-12-12	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-12-14	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-12-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-12-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-14-14	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-14-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-14-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-15-15	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-15-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-34C3A-16-16	-	-	-	●	●	●	●	●	●	●	●	-	-	-	-	-	-	-
XBWS-39C2A-8-8	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-8-10	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-8-11	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-8-12	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
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XBWS-39C2A-8-18	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-8-19	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-8-20	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-10	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-11	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-12	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-14	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-15	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-16	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-18	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-10-19	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
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XBWS-39C2A-11-11	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-11-12	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
XBWS-39C2A-11-14	-	-	-	-	●	●	●	●	●	●	●	●	●	●	-	-	-	-
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XBWS-56C3A-19-20	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-19-22	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-19-24	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-19-25	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-19-28	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-20-20	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-20-22	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-20-24	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-20-25	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-20-28	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-22-22	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-22-24	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-22-25	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-22-28	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-24-24	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-24-25	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-24-28	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-25-25	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-25-28	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●
XBWS-56C3A-28-28	-	-	-	-	-	●	●	●	●	●	●	●	●	●	●	●	●	●

Slip torque

As in the table below, the clamping type XBWS-C has different slip torque according to the bore diameter. Take care during selection.

Unit : N・m

Part Number	Bore Diameter (mm)
Part Number	4	6	8	10	11	12	14	15
XBWS-19C2A	1
XBWS-34C3A		5
XBWS-39C2A			5.5	8
XBWS-44C2A			4.5	6	10
XBWS-56C3A				9	13	18	25	28

These are test values based on the conditions of shaft dimensional allowance: h7, hardness: 34-40 HRC, and screw tightening torque of the values described in XBWS-C dimension tables. They are not guaranteed values.
Slip torque changes with usage conditions. Carry out tests under conditions similar to actual conditions in advance.

Structure

Clamping TypeXBWS-C

XBWS-C Made of All Stainless Steel

XBWS-C_C（NBK2.0用にXBW-Cを消去したもの）Flexible Couplings - Disk Type

Material/Finish

	XBWS-C
Hub	SUS303
Spacer	SUS303
Bolt	SUSXM7
Disk	SUS304
Collar	SUS304
Hex Socket Head Cap Screw	SUSXM7

Characteristics

Recommended Applicable Motor

	XBWS-C
Servomotor	◎
Stepping Motor	◎
General-purpose Motor	●

◎: Excellent ○: Very good ●: Available

Property

	XBWS-C
Zero Backlash	◎
High Torque	○
High Torsional Stiffness	◎
Allowable Misalignment	○
Corrosion Resistance (All S.S.)	◎

◎: Excellent ○: Very good

This is a disk type flexible coupling.
The stainless steel disk allows eccentricity, and angular misalignment, and end-play.
Wide variation of outside diameter φ 15 - φ 56 and bore diameter φ 3 - φ 28.
All stainless steel type with stainless steel hubs.

Application

Actuator / Surface-mount machine / High precision XY stage / Index table

Selection

Selection Based on Shaft Diameter and Rated Torque

The area bounded by the shaft diameter and rated torque indicates the selection size.

XBWS-C_C（NBK2.0用にXBW-Cを消去したもの）Flexible Couplings - Disk Type

Selection Example

In case of selected parameters of shaft diameter of φ15 and load torque of 2 N・m, the selected size is XBWS-34C3A.

Selection Based on the Rated Output of the Servomotor

Rated Output (W)	Servomotor Specifications＊1			Selection Size
	Diameter of Motor Shaft (mm)	Rated Torque (N・m)	Instantaneous Max. Torque (N・m)	XBWS-C
	Diameter of Motor Shaft (mm)	Rated Torque (N・m)	Instantaneous Max. Torque (N・m)	Made of All Stainless Steel
10	5 - 6	0.032	0.096	XBWS-15C
20	5 - 6	0.064	0.19	XBWS-15C
30	5 - 7	0.096	0.29	XBWS-19C
50	6 - 8	0.16	0.48	XBWS-19C
100	8	0.32	0.95	XBWS-25C
200	9 - 14	0.64	1.9	XBWS-34C
400	14	1.3	3.8	XBWS-39C
750	16 - 19	2.4	7.2	XBWS-56C

＊1：　Motor specifications are based on general values. For details, see the motor manufacturer's catalogs. This is the size for cases where devices such as reduction gears are not used.

Eccentric Reaction Force

XBWS-C_T（NBK2.0用にXBW-Cを消去したもの）Technical Information

Thrust reaction force

XBWS-C_T（NBK2.0用にXBW-Cを消去したもの）Technical Information

Change in static torsional stiffness due to temperature

This is a value under the condition where the static torsional stiffness at 20°C is 100%.
The change of XBWS-C in torsional stiffness due to temperature is small and the change in responsiveness is extremely small. If the unit is used under higher temperature, be careful about misalignment due to elongation or deflection of the shaft associated with thermal expansion.

XBWS-C_T（NBK2.0用にXBW-Cを消去したもの）Technical Information