Key Features

Sealed sprag freewheel + ball bearing design: compact, self-contained, no extra bearing needed.

One-way lock & freewheel: locks to transmit torque in one direction; idles freely in reverse to avoid drag.

High torque capacity: nominal torque up to 27,500 lb-ft, bore up to 7 inches.

Pre-lubricated & sealed: oil-filled from factory; dust-tight seals extend service life.

Multiple variants: standard FR, plus FRS/FRX/FRZ for longer life and high-speed use.

Application example

Complete Freewheels FRS 600 in both drive units of a transport system with a conveyor belt that moves both forward and backward (rever-sible operation). In order to ensure that the con-veyor belt is moved under tension, forward movement is driven by drive unit I, reverse mo-vement by drive unit II. The freewheels automa-tically disengage the respective non workingdrive, eliminating the need for expensive exter-nal clutches or brakes.

For forward movement, drive unit II is started in freewheeling direction of freewheel II; free -wheel II is in freewheeling operation and disen-gages drive unit II from the conveyor belt.Afterwords drive unit I is started in the locking direction of the freewheel I; freewheel I is in dri-ving operation and the conveyor belt is movedforward by drive unit I. The speed of drive unit Iis lower than that of drive unit II. Thus freewheelII remains in freewheeling operation and driveunit II is not improperly engaged.

For reverse movement, the drive units are started in reverse order and direction of rota-tion at the corresponding speeds.

Mounting

The customer attachment part is centered on the external diameter D and then bolted on to the face.

The tolerance of the shaft must be + 0 / - 0,001 inch and the tolerance of the pilot diameter D of the attachment part must be - 0 / + 0,002 inch.

The maximum transmissible torque is 2 times the specified nominal torque. See page 14 for determination of selection torque.

* Z = Number of tapped holes G on pitch circle T.

** Six holes are equally spaced 60° apart with two additional holes located 30° from the six equally spaced holes and 180° apart.

Conversion factors: 1 lb-ft= 1,35 Nm, 1 inch = 25,4 mm, 1 lbs = 0,453 kg.

Example for ordering

Freewheel size FR … 700, type with sprag lift-off

Z and 2 inch bore:

• FRZ 700, d = 2 inch

FAQ

Q1: What is a FR series one-way clutch bearing?

A: It is a sealed sprag freewheel with ball bearings, a self-contained one-way clutch bearing that locks in one direction and freewheels in reverse, supplied oil-filled and ready for installation.

Q2: What are the main functions of FR freewheels?

A: Three core functions: backstopping (anti-reversal), overrunning (decoupling), and indexing (step feed)—typical for one-way clutch bearings.

Q3: What is the maximum torque and bore size available?

A: Nominal torque up to 27,500 lb-ft; max bore 7 inches. Standard inch bores in stock; metric bores available on request.

Q4: Are FR one-way clutch bearings pre-lubricated?

A: Yes. FR models are oil-filled; FRSG variants are grease-filled. All are sealed for dust and contamination protectionChangzhou Suma Precision Machinery Co., Ltd.

Q5: Can FR freewheels be used in high-speed applications?

A: Standard FR works for general speeds. For high-speed overrunning, choose FRX/FRZ with sprag lift-off—sprags run contact-free in freewheel mode for minimal wear.

Q6: How to mount the FR one-way clutch bearing?

A: Install on through shaft or shaft end. For backstop use, fit torque arm with 1/4–1/2 inch radial/axial clearance; avoid rigid clamping.

Q7: What industries use FR series freewheels most?

A: Conveyors, elevators, pumps, packaging machinery, printing equipment, and general power transmission systems requiring anti-reversal or overrunning.