Torque specification sheets or information.

[HPedrazaB]

Hello:
I have a question about torque spec. The story is the following:
I have some molding tools for composites material, but to close and hold some plates has screws. The molding tools are from Aluminum. The holes for screws are threaded into molding tool, so I want to know if I can found a torque specs for this application? or if someone with experience in this field can help. The screws are form 3/4", 5/8", 9/16", 1/2".
Another comment is those molding tools are submitted to a 2500 PSI pressure.

I appreciated any help in this matter.

H. Pedraza.

 

[SnTMan]

HPedrazaB, this might be better asked in the Welding, Bonding and Fastener Engineering forum, but..

Figure out the clamping load you need from your fasteners, calculate the bolt stress required to get it and calculate the torque required from that. Make sure the clamped components can withstand the bolt load. Note is it generally held that torque is a poor way to control bolt stress.

This kind of question gets asked endlessly, try a site search for a fuller discussion.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[KENAT]

As implied, for non standard material combinations, engagement lengths....

You probably won't find a pre calculated suggested torque value etc. (and even if you do need to be careful to verify if really applies to your desired application) but will have to calculate it.

Also as SnTMan says, torque isn't great way to control preload. So make sure you can accept variation in preload and or take measures to control it better e.g. the friction between nut & screw...

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