STL-F Series

Safety Coupling

Safety Coupling is the most optimistic solution to meet both purposes
of power transmission and overload prevention.

Safety Coupling for Torque Overload Protection (Flange Type)

Product Overview
Dimensions / Performance / CAD

STL Series [Coupling attached Type]How to order STL-F Series [Flange Type]How to order

STL – 2D (.dwg)
STL – 3D (.step)

General Set-screw Type

A.P. LOCK Type

Dimensions / Performance

Model	CAD	Torque Range (N·m)	Spring		Size (±0.3mm)
Model	CAD	Torque Range (N·m)	Color	Q’ty	D	D_F	D_N	D_L	L	H	O	P	Q	R	X	F₂
STL25F-L		1.5~7	BLUE	3	74	30	58	30	64.8	24	2	35.6	27.2	12.5	1.2	24.5
STL25F-M		4.5~20	RED	6
STL25F-H		9~25	GREEN	6
STL55F-L		7.5~27	BLUE	6	104	45	70	40	71.9	40	3	42.9	26	14.5	1.3	20.5
STL55F-M		13.5-41	RED	6
STL55F-H		21-55	GREEN	6
STL150F-L		20~50	BLUE	5	125	60	90	55	80.1	52	4	50.1	26	14.5	2.1	20.5
STL150F-M		30~80	RED	5
STL150F-H		55~150	GREEN	10

Model	CAD	M_F		M_S		M_N		M_L		Max. rpm (min^-1)	Moment of Inertia (kg·m²)	Mass (kg)
Model	CAD	Size	P.C.D	Size	Fastening Torque	Size	Fastening Torque	Size	Fastening Torque	Max. rpm (min^-1)	Moment of Inertia (kg·m²)	Mass (kg)
STL25F-L		4-M4 DP8	40	2-M3	0.7	2-M4	1.7	4-M4	3.5	700	6.4X10^-4	1.1
STL25F-M
STL25F-H
STL55F-L		6-M6 DP8	60	2-M4	1.7	2-M5	4	6-M4	3.5	550	2.1X10^-3	2.4
STL55F-M
STL55F-H
STL150F-L		6-M8 DP10	75	2-M6	7	2-M6	7	6-M4	3.5	400	7.2X10^-3	3.9
STL150F-M
STL150F-H

Standard Inner Diameter (ID)

Model		Standard Inner Diameter (d₁, d₂) (mm)
Model		10	11	12	14	15	16	17	18	19	20	21	22	24	25	28	30	32	35
STL25F	General	●	●	●	●	●
STL25F	A.P. Lock	●	●	●
STL55F	General				●	●	●	●	●	●	●	●	●	●	●
STL55F	A.P. Lock				●	●	●	●	●	●	●
STL150F	General					●	●	●	●	●	●	●	●	●	●	●	●	●	●
STL150F	A.P. Lock					●	●	●	●	●	●		●	●	●	●	●	●	●

Tightening amount – Slip torque correlation chart

How to Order

① Disengagement Torque Set-up

No mark: User’s own set-up

TS(torque): Already set-up at a certain torque at the dispatch stage

② Keyway

No mark: No Keyway

K(b size): Keyway processed according to the indicated b size. (Keyway is not applicable on A.P. Lock type)

③ Clamping way of torque limiter side

N: General Set-screw Type

P: A.P. Lock Type

※ N type products (General set-screw on Torque limiter side) should be accompanied with key/keyway due to structural reasons. If the size of keyway is non-standard, please contact our customer service team.
(In case your device cannot have a key, please make sure you discuss with our customer service team before placing an order.)

※ Due to its structural conditions, STL series cannot be modified once it is processed.