Axial Holding Power

The primary function of a shaft collar is to retain its position on a shaft. The amount of axial load (pounds or newtons) required to initiate slippage of a properly installed collar is defined as the Axial Holding Power. Since this result is a function of tension induced by the screw as well as the coefficient of friction between the collar and shaft, it can be affected by many variables (smoothness of the friction surfaces, plating or lubrication on shaft or screw, size of screw and wrenching torque applied).

Because there are so many variables involved in determining the actual axial holding power between a specific collar and shaft, it is not possible for Stafford to certify a single value for all situations. Instead, we can provide results that have been obtained from testing under a controlled set of conditions that most accurately represent a standard operating environment. These results should be used as a guide only for projected shaft collar performance, and should not, under any circumstances, be used as guaranteed values. The user must determine the product suitability in a particular application.

For additional information about axial holding power, how it is measured, or how to select the correct part for a specific application, contact us directly.

AXIAL HOLDING POWER

Steel Collars - Inch Sizes

Alloy Socket Head Cap Screws
Maximum Screw Torque (in-lbs)
Axial Holding Power (lbs)
4-40
12
235
6-32
23
355
8-32
41
546
10-32
60
785
1/4-28
168
1510
5/16-24
324
2412
3/8-24
588
3653
1/2-20
1440
6657

AXIAL HOLDING POWER

Steel Collars - Metric Sizes

Alloy Socket Head Cap Screws
Maximum Screw Torque (Nm)
Axial Holding Power (N)
M3
1.8
1325
M4
4.3
2000
M5
8.7
4000
M6
14.8
9350
M8
35.9
13500