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PEM Stud proof load

PEM Stud proof load

PEM Stud proof load

(OP)
Hi all, hoping someone can help. This is probably quite simple, but today brain like jello!

Usually if I am to do a quick hand calculation on fixing products to structures I use the following approach;

Firstly determine all max tension and shear forces

So, example M6 Bolts Grade 8.8 Nickel Plated Steel
Proof Load  of bolt = 11500N
Tighteneing Torque = 11.7Nm @ 85% proof load

Bolt Preload = 0.85 x Proof Load
Shear capacity = (Bolt Preload - Max Tension) * Friction Coefficient

Rf connection =  Shear capacity / Max Shear


What I am unsure about is the proof load for an M6 Pem Ttype push stud. The datasheet seems to suggest a max tightening torque of 5.9Nm, which is considerably less than an M6 bolt (for obvious reasons), but how do I calculate the proof load

D
 

RE: PEM Stud proof load

Ask Pem?
 

Mike Halloran
Pembroke Pines, FL, USA

RE: PEM Stud proof load

varistor,

The proof load is meaningless for clinch-type fasteners, because it is the clinch area that is the weakest, not the threads or the shank.  As a first pass, you can use the equation T = kDF where T = torque, k is a friction factor, D is the major diameter and F is the preload.  Since you already know T = 5.9 Nm maximum, solve for F.  k is usually between 0.1 and 0.2 depending on the coatings and lubricants involved.

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