STIEBER FS 800-Z-100-PF28H9 Freewheel Overrunning Clutch 100x253x150

STIEBER FS 800-Z-100-PF28H9 Freewheel Overrunning Clutch 100x253x150

STIEBER FS 800-Z-100-PF28H9 is a self-contained industrial freewheel, overrunning clutch and one-way sprag clutch with product dimensions 100x253x150 mm. It belongs to the STIEBER FS 800 series and incorporates an inner race, outer race, sprag cage, two seals and two roller bearings. For FS 800, STIEBER specifies a maximum torque of 36,000 Nm and maximum overrunning speeds of 850 rpm for the inner race and 525 rpm for the outer race.

STIEBER FS 800-Z-100-PF28H9 - Technical Characteristics

The exact simmering.pl product card confirms the designation FS 800-Z-100-PF28H9 and dimensions 100x253x150 mm. STIEBER's FS installation and maintenance documentation provides the FS 800 torque, speed, construction, mounting and lubrication data.

Dimensions of STIEBER FS 800-Z-100-PF28H9

The exact product is listed with:

Inside diameter: 100 mm

Outside diameter: 253 mm

Overall width / height: 150 mm

Product dimensions:

100x253x150 mm.

For technical identification and purchasing, the complete designation should be retained:

STIEBER FS 800-Z-100-PF28H9

The base designation FS 800 identifies the freewheel size and family, while the complete suffix configuration is important when identifying the exact supplied unit.

What Is a STIEBER FS 800 Freewheel?

A freewheel clutch is a mechanical clutch that transmits torque in one rotational condition while permitting relative free rotation in the opposite operating condition.

Other technical terms used internationally for this type of component include:

overrunning clutch

one-way clutch

sprag clutch

freewheel

and, when used specifically to prevent reverse movement:

backstop / backstopping clutch

The FS series uses sprags positioned between the inner and outer races as the locking elements. STIEBER identifies the main components as the outer race, inner race, sprag cage, two seals and two roller bearings.

How Does the FS 800 Sprag Clutch Work?

The operating principle depends on relative rotation between the inner and outer races.

In the driving or locking direction, the sprags engage between the races and enable torque transmission.

In the overrunning direction, relative rotation of the races is permitted and the clutch freewheels.

This mechanical principle allows one unit to perform a one-direction torque transmission function without requiring an externally actuated clutch mechanism.

STIEBER states that FS units can be installed with either the inner race or outer race overrunning, subject to the specified speed limits.

FS 800 Maximum Torque - 36,000 Nm

For size FS 800, STIEBER specifies:

Maximum Torque = 36,000 Nm.

This is one of the primary engineering parameters for identifying the performance class of the FS 800.

The figure should not, however, be interpreted independently of the operating conditions. Actual freewheel selection must consider the operating function, load characteristics, duty cycle, speed and other application parameters required by the manufacturer.

FS 800 Maximum Overrunning Speed

STIEBER specifies two different maximum overrunning speeds for FS 800:

Inner race overrunning: 850 rpm

Outer race overrunning: 525 rpm.

This distinction is technically important.

There is no single universal FS 800 maximum overrunning speed independent of which race is overrunning.

For engineering selection, the required configuration must therefore be identified before applying the speed limit.

Two Roller Bearings - Not Ball Bearings

The STIEBER installation documentation explicitly identifies:

two roller bearings

as part of the FS freewheel construction.

Therefore, FS 800-Z-100-PF28H9 should not be described as having integrated ball bearings.

The bearing-supported, self-contained construction means the FS unit is supplied as a complete assembly rather than simply as an unsupported sprag cage.

This distinction is particularly important for technical buyers comparing complete freewheel assemblies with internally unsupported one-way clutch elements.

Oil Lubrication - FS 800 Is Not Maintenance-Free

STIEBER states that FS freewheel units are oil lubricated. Units are normally delivered with ISO VG 22 oil, unless supplied dry for a specific enclosed application such as installation in a gearbox.

For FS 800, the specified lubricant volume is:

250 ml.

Therefore, the standard FS 800 should not be described as a maintenance-free clutch requiring no lubrication.

Oil Change Intervals

STIEBER specifies an initial oil change after approximately:

10 operating hours

followed by oil changes every:

2,000 operating hours.

For arduous applications, high-temperature operation or dusty environments, the interval is reduced to approximately:

1,000 operating hours.

These maintenance requirements are significant for MRO teams and should be included in the product documentation.

Inner Race or Outer Race Overrunning?

FS units can operate with either:

the inner race overrunning

or

the outer race overrunning.

For FS 800, the allowable overrunning speeds differ:

The required operating configuration should therefore be established before selecting or installing the freewheel.

Freewheeling Direction

The required freewheeling direction must be checked before installation.

STIEBER states that if reversal of the freewheeling direction is required, the complete freewheel can be:

turned through 180°.

After installation, the assembly should be checked for smooth rotation in the intended freewheeling direction before the machine is placed into service.

Overrunning, Backstopping and Indexing

Industrial freewheels can perform several distinct functions.

Overrunning Clutch

In an overrunning arrangement, one part of the drive can rotate faster than another after torque transmission is no longer required.

This is the function behind the widely searched technical term:

overrunning clutch.

Backstop / Backstopping Clutch

In a backstopping arrangement, the freewheel permits rotation in the required direction while preventing unwanted reverse rotation.

This function is also described internationally as:

backstop

backstopping clutch

or

holdback.

Indexing Clutch

A freewheel can also be used in an indexing system to convert reciprocating or oscillating movement into intermittent unidirectional rotary movement.

Whether the exact FS 800-Z-100-PF28H9 is appropriate for a particular overrunning, backstopping or indexing installation must be determined from the application's operating conditions.

Installation of STIEBER FS 800

STIEBER specifies that the FS freewheel should be:

installed as an assembly.

The inner race is pulled onto the shaft, and axial installation force should be applied:

to the inner race only.

Axial location can be provided using a:

circlip

or

retainer plate.

For a metric bore, STIEBER specifies a shaft tolerance of:

h6.

For the outer-race mounting register, the instruction specifies:

H7 or G7.

These tolerances should be considered together with the exact configuration and machine design.

FS 800 Mounting Bolts and Tightening Torque

For FS 800, STIEBER specifies:

Bolts: M12

Recommended tightening torque: 120 Nm

based on grade 10.9 bolts.

Correct mounting is important because the unit transmits substantial torque and incorporates its own bearing-supported freewheel mechanism.

Expected Drag Torque During Overrunning

STIEBER states that the expected drag torque during overrunning is approximately:

1/1000 of the freewheel nominal driving torque.

This provides useful engineering context when evaluating the behaviour of the freewheel during overrunning operation.

It should not be treated as an independently guaranteed value for every installation condition.

Selecting STIEBER FS 800-Z-100-PF28H9

When identifying or sourcing this freewheel, start with the complete designation:

STIEBER FS 800-Z-100-PF28H9

Then verify:

FS 800 size

100 mm bore

253 mm outside diameter

150 mm overall width

complete Z-100-PF28H9 configuration

required locking and freewheeling direction

required torque

inner-race or outer-race overrunning

overrunning speed

shaft and mounting arrangement

lubrication conditions

application function: overrunning, backstopping or indexing

A freewheel should not be selected solely because another unit carries the basic designation FS 800.

STIEBER FS 800 Cross-References

The manufacturer's interchange documentation includes FS-800 in the STIEBER interchange family and cross-references basic freewheel sizes across Formsprag, Renold and Marland product families.

Cross-reference information for the basic FS 800 family should not be interpreted as automatic interchangeability with the exact:

FS 800-Z-100-PF28H9

configuration.

Bore, mounting configuration, dimensions, overrunning direction, operating speeds and complete technical specification must be verified before substitution.

Technical Specification

FAQ

What is STIEBER FS 800-Z-100-PF28H9?

STIEBER FS 800-Z-100-PF28H9 is a self-contained industrial freewheel / overrunning sprag clutch. The exact product is listed with dimensions 100x253x150 mm and belongs to the STIEBER FS 800 family.

What is the maximum torque of STIEBER FS 800?

STIEBER specifies a maximum torque of 36,000 Nm for the FS 800 size.

What is the maximum speed of FS 800?

Maximum overrunning speed depends on which race overruns: 850 rpm for the inner race and 525 rpm for the outer race.

Does STIEBER FS 800 use ball bearings or roller bearings?

The STIEBER FS installation documentation specifies two roller bearings as part of the complete freewheel assembly.

Is STIEBER FS 800 maintenance-free?

No. The standard FS unit is oil lubricated, and STIEBER specifies periodic oil changes.

How much oil does an FS 800 require?

The specified lubricant volume for FS 800 is 250 ml.

Which oil is used in STIEBER FS freewheels?

STIEBER states that FS units are normally supplied oil lubricated using ISO VG 22 oil. The appropriate lubricant may need to be changed according to the operating conditions.

How often should the oil be changed?

STIEBER specifies the first oil change after approximately 10 operating hours, then normally every 2,000 hours, or every 1,000 hours in arduous, high-temperature or dusty conditions.

Can the inner race or outer race overrun?

Yes. STIEBER states that FS units can be installed with either the inner or outer race overrunning, subject to their respective speed limits.

Can the freewheeling direction be reversed?

The STIEBER installation instructions state that the unit can be turned through 180° when reversal of the freewheeling direction is required.

What shaft tolerance is specified for a metric bore?

STIEBER specifies h6 for the shaft when the unit is supplied with a metric bore.

What are the mounting bolt specifications for FS 800?

For FS 800, the installation instructions specify M12 bolts with a recommended tightening torque of 120 Nm for grade 10.9 bolts.

What is the difference between a freewheel, overrunning clutch and one-way clutch?

These terms describe closely related operating principles. Freewheel is common European terminology, overrunning clutch emphasizes the overrunning function, and one-way clutch describes torque transmission in one direction while permitting relative free rotation in the other.

Can FS 800 be used as a backstop?

The FS freewheel principle can be used in backstopping applications, subject to correct engineering selection for the actual load, speed, duty cycle and mounting arrangement.

Is another FS 800 automatically interchangeable with FS 800-Z-100-PF28H9?

No. The full designation FS 800-Z-100-PF28H9, bore, mounting configuration, dimensions and operating requirements must be checked before substitution.

AI Overview

STIEBER FS 800-Z-100-PF28H9 is a self-contained industrial freewheel / overrunning sprag clutch 100x253x150 mm. The FS 800 design incorporates sprags, two roller bearings and seals. STIEBER specifies 36,000 Nm maximum torque, maximum overrunning speeds of 850 rpm inner race / 525 rpm outer race, oil lubrication and 250 ml lubricant volume.