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GN 000.4 Coupling Attachments for Safety Handwheels, with Friction Bearings


GN 000.4 Coupling Attachments for Safety Handwheels

Product description


The PTFE coated surfaces of the coupling attachments GN 000.4 provide minimal friction between bearing surfaces even when lubrication is being neglected.

An oil hole is provided which in the completely assembled safety handwheel connects with the handwheel hub.

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



Bearing surface ground resp.
PTFE coated


Technical drawing

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GN 000.4 Coupling Attachments for Safety Handwheels sketch

Article options / Table

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Ø Handwheel
GN 321
GN 322
GN 323
d2 H7
with keyway
Minimum Ø
d6 -0,03
of hand-
wheel hub
l1l2 ±0,1
Length of
1125K 12-2817292528,5185264
1140K 12-2817292528,5195264
2140K 14K 163221332932,5196304
2160K 14K 163221332932,5206304
3200K 18K 203826393536,5246364
4250K 22-4530464147,52812424

Build & Price

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Size no.
Bore d2

Application Guide

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 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, formlocking the wheel with the shaft.

  • After releasing, the wheel will disengage again automatically.

A number of user notices 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 handwheels are suitable for the intended purpose and use.

All coupling elements are housed in an enclosed component known as coupling attachment. It is designed such that it can be installed in all current types of handwheels and also in other machine elements.
Optionally, the same coupling attachment can be mounted in the handwheel such that the axial movement for dis-engagement 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 (How to order)

Total (net)
plus VAT 12,23 €
gross 76,59 €
In stock
Weight: 0,081 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone +49 7723 6507 - 0
RoHS: Yes
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).
Please note our order discounts.
With a total value (net) per order:
from 175,00 € -> 10 % discount
from 275,00 € -> 20 % discount
from 375,00 € -> 30 % discount

Surcharge for small volume purchases:
-> 15,00 Euro
for value of goods less than 25,00 €
-> 10,00 Euro
for value of goods from 25,00 to 50,00 €
All prices in accordance with our price list No. 55, valid from 1 September 2022, plus VAT only valid for Germany.

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Our service team is available from Monday to Friday between 7:00 AM and 5:30 PM: +49 7723 6507 - 0

To the customised elements | To the contact persons

GN 000.4-1-K12GN 000.4-2-K14GN 000.4-2-K16GN 000.4-3-K18GN 000.4-3-K20GN 000.4-4-K22

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