Slit Type Flexible Coupliing

MST-K Keyway Type

Merits

Zero Backlash

Design changes in the aluminum alloy's slit pattern have improved performance
Recipient of the 1998 Ministry of Economy, Trade and Industry Good Design Award
One-piece metallic spring coupling
Absorption of parallel, angular misalignments and shaft end-play by spring action
High torsional stiffness and response
Identical clockwise and counter-clockwise rotational
Available in aluminum alloy and stainless steel
Available in a wide range of sizes Outer diameter: φ8〜φ63
Finished products featuring two different end bore diameters available in stock.
We produce clean washed, single piece specialty couplings constructed of SUS304 steel for special environment use Please inquire for price and delivery time

Application

Servomotor	-
Stepping Motor	A
General-purpose Motor	-
Encoder	-

Features

Zero Backlash	A
High Torsional Stiffness	B
High Torque	B
Absorption of Misalignment	B
Vibration Absorption	-
Electrical Insulation	-
Corrosion Resistant ( All Stainless Steel)	A

A : Excellent B : Very Good

Eccentric Reaction Force / Thrust Reaction Force / Changes in Static Torsional Stiffness Caused by Temperature [PDF 145KB]

Configuration & Material

*Stock screws can be replaced with stainless steel screws. Please take advantage of our stainless steel screw option.
For more information please refer to Stainless Steel Screws [PDF 256KB].

Dimensions

unit:mm
Catalog Number	A	L	W	F	M	Wrench Torque (N·m)
MST-32K	32	12	41	6	M4	1.7	MST32K.dxf	MST32K
MST-40K	40	17	56	8.5	M5	4	MST40K.dxf	MST40K
MST-50K	50	21	71	10.5	M6	7	MST50K.dxf	MST50K
MST-63K	63	26	90	13	M8	15	MST63K.dxf	MST63K
MSTS-32K	32	12	41	6	M4	1.7	MSTS32K.dxf	MSTS32K
MSTS-40K	40	17	56	8.5	M5	4	MSTS40K.dxf	MSTS40K
MSTS-50K	50	21	71	10.5	M6	7	MSTS50K.dxf	MSTS50K
MSTS-63K	63	26	90	13	M8	15	MSTS63K.dxf	MSTS63K

Stock Bores Diameters D	Keyways				Keys
	b		t		b×h
	Basic Size	Tolerance (JS9)	Basic Size	Tolerance	b×h
12	4	±0.0150	1.8	+0.1 0	4×4
14 16	5		2.3		5×5
18 20	6		2.8		6×6
25 30	8	±0.0180	3.3	+0.2 0	8×7

Specifications

Catalog Number	Max. Bore (mm)	Rated Torque (N·m)	Max. Torque (N·m)	Max. Rotational Frequency (min^-1)	Moment of Inertia^* (kg·m²)	Static Torsional Stiffness (N·m/rad)	Errors of Eccentricity (mm)	Errors of Angularity (°)	Errors of Shaft End-Play (mm)	Mass^* (g)
MST-32K	14	4	8	19000	9.6x10^-6	500	0.15	2	±0.5	59
MST-40K	18	8	16	15000	3.2x10^-5	700	0.2	2	±0.5	130
MST-50K	20	16	32	12000	1.0x10^-4	1800	0.2	2	±0.5	270
MST-63K	30	32	64	10000	3.2x10^-4	3100	0.2	2	±0.5	490
MSTS-32K	14	3.5	7	19000	2.6x10^-5	850	0.15	2	±0.5	160
MSTS-40K	18	8	16	15000	8.6x10^-5	1000	0.2	2	±0.5	340
MSTS-50K	20	15	30	12000	2.8x10^-4	1400	0.2	2	±0.5	730
MSTS-63K	30	35	70	10000	8.5x10^-4	1800	0.2	2	±0.5	1300

*Adjustment of rated and maximum torque specifications for load fluctuations is not required.
For more detailed information, please refer to Selection Guidelines [PDF 171KB].
**Based on the maximum shaft bores.

Stock Bores

Catalog Number	RoHS	Stock Bores D₁·D₂
MST-32K	Compliant
MST-40K	Compliant
MST-50K	Compliant
MST-63K	Compliant
MSTS-32K	Compliant
MSTS-40K	Compliant
MSTS-50K	Compliant
MSTS-63K	Compliant

●All products come with cap screws.
●Recommended tolerance on shaft diameters is h6 and h7.
●Bore and keyway modifications are available on request. Please take advantage of our bore modification services.
For more information please refer to Custom Bore Modifications [PDF 495KB].
*[MSTS] stainless steel is a standard product.