Zip Fastener Products, Inc engineers have the experience to provide information for you to be able to determine the design of your assembly and fastener.
If you do not see the information you need, or have questions, please call us at the phone number to the left and we will be glad to help with your design.
We will be adding new information on a regular basis, so check back whenever you need more info.
Using this formula you can:
T = K x D x F
T = torque (lb-in)
K = nut factor (dimensionless)
D = fastener diameter (in)
F = clamp force (lbs)
K is a measure of friction (not the coefficient of friction) and is available for most coating finishes. The chart below lists some of the commercially available coatings.
Fastener Finish |
Joint Material |
Nut Factor |
---|---|---|
Dry Steel |
Dry Steel |
.18-.27 |
Machine Oil |
Steel |
.10-.26 |
Cadmium |
Steel |
.15-.19 |
Phos & Oil |
Steel |
.15-.22 |
Zinc |
Steel |
.17-.35 |
302 S.S. |
302 S.S. |
.30-.50 |
Dacromet |
Steel |
.16-.32 |
If you are interested in learning more about this, please give us a call.