SF107 Cage Freewheel Sprag Clutch | Heavy Duty One Way Freewheel Assembly

Introduction: What Is SF107 Sprag Clutch?

The SF107 Sprag Clutch is a heavy-duty SF Series Cage Freewheel designed for industrial power transmission systems requiring reliable one-way torque transmission, overrunning and backstop protection.

Unlike self-contained one-way bearings, the SF Series consists of a precision sprag cage assembly that is installed between customer-supplied inner and outer raceways. This flexible design allows engineers to integrate the clutch into customized transmission systems while maintaining high torque capacity and compact installation.

SF Series freewheels are widely used for:

Backstopping
Overrunning
Indexing
Heavy-duty industrial transmission

Product Overview

Item	Specification
Model	SF107-25
Product Type	Cage Freewheel Sprag Clutch
Series	SF Series
Structure	Sprag Cage Assembly
Inner Diameter (J)	107 mm
Outer Diameter (D)	125 mm
Width (B)	25 mm
Nominal Torque	3300 Nm (K / KT)
Torque (KZ)	3100 Nm
Sprag Quantity	48
Lift-off Speed	1300 rpm
Weight	0.35 kg
Application	Industrial Machinery

Working Principle

Locking Direction

During power transmission:

Sprag elements wedge automatically between the inner and outer race.
Torque is transmitted instantly without slipping.
Mechanical efficiency remains high even under heavy loads.

Overrunning Direction

When the driven shaft rotates faster than the driving shaft:

Sprags release automatically.
The clutch freewheels smoothly.
Reverse torque is eliminated, protecting the transmission system.

Key Features of SF107 Sprag Clutch

High Torque Capacity

SF107 provides a nominal torque of up to 3300 Nm, making it suitable for heavy-duty industrial equipment requiring reliable one-way power transmission.

Precision 48-Sprag Design

The clutch incorporates 48 precision sprag elements, ensuring:

Uniform load distribution
Fast engagement
Stable locking
Reduced wear

Compact Cage Assembly

The SF Series cage design offers several advantages:

Feature	Benefit
Compact structure	Easy integration
Lightweight	Only 0.35 kg
Flexible installation	Customer-supplied raceways
High torque density	Excellent performance

Multiple Versions Available

SF107 is available in three configurations:

Type	Torque Capacity
K	3300 Nm
KT	3300 Nm
KZ	3100 Nm

Different versions allow engineers to select the most suitable clutch according to speed, torque and application requirements.

Typical Applications

SF107 is widely used in:

Industry	Application
Mining Equipment	Backstop systems
Conveyor Systems	Reverse prevention
Gearboxes	Overrunning clutch
Steel Industry	Drive transmission
Cement Plants	Heavy-duty drives
Textile Machinery	Indexing mechanisms
Packaging Machinery	One-way transmission

Advantages Over Conventional Clutches

Comparison	SF107 Sprag Clutch	Friction Clutch
Locking Method	Mechanical Sprag Locking	Friction
Response	Instant
Torque Density	High	Medium
Maintenance	Low	Higher
Slip	None	Possible

Freewheel Size	Type	Nominal t orque	Type	Nominal t orque	Type	Nominal t orque	Sprag lift-off at outer ring speed min-1	J	D	B	K	Sprags Quantity	Weight
		MN		MN		MN		mm	mm	mm	mm		kg
		Nm		Nm		Nm
SF18-13,5	J	66						18,80	35,47	13,5	50	10	0,04
SF23-13,5	J	120						23,63	40,29	13,5	55	12	0,04
SF27-13,5	J	160	JT	160	JZ	100	3 600	27,78	44,42	13,5	65	14	0,05
SF31-13,5	J	170	JT	170	JZ	110	3 400	31,75	48,41	13,5	70	12	0,04
SF32-21,5	J	400						32,77	49,44	21,5	65	14	0,07
SF37-14,5	K	270	KT	270	KZ	210	2 900	37	55	14,5	75	14	0,06
SF42-21	J	720						42,10	58,76	21	85	18	0,09
SF44-14,5	K	500	KT	500	KZ	400	2 250	44	62	14,5	90	20	0,08
SF46-21	J	840						46,77	63,43	21	90	20	0,10
SF50-18,5	K	680	KT	680	KZ	580	2 250	50	68	18,5	90	20	0,10
SF56-21	J	1 050						56,12	72,78	21	100	22	0,11
SF57-18,5	K	950	KT	950	KZ	800	2 000	57	75	18,5	105	24	0,13
SF61-21	J	1 300	JT	1 300	JZ	1 150	1 550	61,91	78,57	21	110	26	0,14
SF72-23,5	K	2 100	KT	2 100	KZ	1 850	1 550	72	90	23,5	135	32	0,23
SF82-25	K	2 300	KT	2 300	KZ	2 100	1 450	82	100	25	140	36	0,26
SF107-25	K	3 300	KT	3 300	KZ	3 100	1 300	107	125	25	170	48	0,35
SF127-25	K	4 900	KT	4 900	KZ	4 600	1 200	127	145	25	210	56	0,40

Manufacturing Capability

LSTO manufactures high-quality SF Series sprag clutches using:

Precision CNC machining
Heat-treated alloy steel
High-accuracy grinding
Strict dimensional inspection
100% functional testing

Each product is manufactured to ensure reliable locking performance and long service life in demanding industrial environments.

OEM & Custom Manufacturing

LSTO provides:

OEM production
Drawing-based manufacturing
Customized dimensions
Sprag quantity optimization
Heavy-duty transmission solutions

FAQ

What is SF107 Sprag Clutch?

SF107 is a heavy-duty cage freewheel sprag clutch designed for industrial overrunning, indexing and backstop applications.

What is the torque capacity?

Up to 3300 Nm for K and KT versions, and 3100 Nm for the KZ version.

How many sprags does SF107 use?

SF107 incorporates 48 precision sprags for stable one-way torque transmission.

Can LSTO manufacture OEM versions?

Yes. LSTO supports OEM production according to customer drawings, samples and technical specifications.

Conclusion

The SF107 Cage Freewheel Sprag Clutch is a heavy-duty one-way clutch engineered for demanding industrial transmission systems. Featuring a 3300 Nm torque capacity, 48 precision sprags and a compact cage assembly, it delivers reliable overrunning, backstopping and indexing performance. With OEM customization, precision manufacturing and strict quality control, LSTO provides dependable sprag clutch solutions for global industrial customers.

SF107 Cage Freewheel Sprag Clutch for Industrial One Way Transmission