GN 000.4 Safety Clutch Assemblies Steel, for Safety Clutch Handwheels, with Friction Bearing


GN 000.4 Steel Safety Clutch Assemblies, for Safety Clutch Handwheels, with Friction Bearing

Product description


The PTFE coated bearing surfaces of the safety clutch assemblies GN 000.4 guarantee minimal friction and best wear resistance.

An oil hole is provided which is connected to a pressure oiler in the wheel hub when the safety clutch handwheel is completely assembled.

The coupling attachment is axially secured in the handwheel hub by a clamping nut.


Steel, nitrided

Ground resp. PTFE coated bearing surfaces


Technical drawing

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GN 000.4 Steel Safety Clutch Assemblies, for Safety Clutch Handwheels, with Friction Bearing sketch

Part Options / Table

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Dimensions in: Inch (change to Metric)
Handwheel Ø
GN 321
GN 322
GN 323
d2 +0.001
with keyway
Minimum Ø
of wheel hub
d6 -0.001
of hand-
wheel hub
l1l2 ±0.004
Length of
wheel hub
14.92K 12-1.100.671.140.9841.120.7090.201.020.16
15.51K 12-1.100.671.140.9841.120.7480.201.020.16
25.51K 14K 161.260.831.301.1421.280.7480.241.180.16
26.30K 14K 161.260.831.301.1421.280.7870.241.180.16
37.87K 18K 201.501.021.541.3781.440.9450.241.420.16
49.84K 22-1.771.181.811.6141.871.1020.471.650.16

Build & Price

3D Product Configurator
Bore with keyway d2

Application Notes

The relevant health and safety at work provisions state that handwheels must be attached to spindles such that they are not turned along together with the machine drive assembly. Safety clutch handwheels meet this requirement:

  • If not in operation, the wheel is disengaged. Shifting it in axial direction (pushing or pulling) will intermesh two serrated bushings, engaging the wheel with the shaft.

  • After releasing, the wheel will disengage again automatically.

A number of user notices for various design types are listed below. These notices are non-binding and given without liability. They do not constitute a warranty of proper function. The user must in any case determine whether the safety clutch handwheels are suitable for the intended purpose and use.

All coupling elements are housed in an enclosed component known as a safety clutch assembly. It is designed such that it can be installed in all current types of handwheels and also in other machine elements.
Optionally, the same safety clutch assembly can be mounted in the handwheel such that the axial movement for disengagement is either “pulling” or “pushing” for disengaging. The “pushing” version is safer in terms of health and safety at work because the risk of inadvertent engagement is lower.

Type A (without handle)

As there is no unbalance (handle), this handwheel will also turn along with the drive, but it can be stopped by hand.
With the wheel moving along, the bearing is not put under excessive strain, with the effect that this type is particularly suitable for continuous operation. At higher speeds, the unbalanced handwheel may cause vibrations, however. Also, the friction heat which develops when braking the wheel must be kept in mind.

Type D (with handle)

The handle (unbalance) causes the disengaged handwheel to stop while the shaft is turning. Owing to the type of construction and bearing design of these couplings, the use of these handwheels is usually limited to relatively slow-turning spindle speeds or spindle speeds running at higher speed for short
periods. A high risk of dirt deposits (grinding dust) and dry-running can limit the user options even further.
If the handwheel and its handle are deliberately or inadvertently set in (concurrent) motion while the shaft is turning, bearing friction may cause the wheel to turn permanently. At higher speeds, this may cause vibrations and, considering the rotating mass of the handle, can result in injuries also if disengaged. This risk / operating status must therefore be avoided at all cost.

Selected Part

Total US Dollars (net)
In Stock: 70
In Stock
Please note our quantity discounts (US Dollars).
≥ 50$67.50
Prop 65: Not compliant
Cancer and Reproductive Harm -
RoHS: Compliant
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Weight: 0.178 lbs
If weight is not listed, please contact our Sales Department for additional information regarding weight.
Phone: 800-877-8351
All Prices are in US Dollars. Taxes Not Included.

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