Michael is right, you need to determine the materials and environment of use to make the BEST decision.

For a general starting point we use the following;

2-56    4-6 inlb
4-40    8 inlb
6-32    10 inlb
8-32    20 inlb
10-32   32 inlb

These are GENERIC values that are a starting point for us.  We have an application where we use a 6-32 square cone screw to hold a device clip that requires 15 inlb to work correctly.

Hope this helps you get started.

Phil Nutting

-----Original Message-----
From: Hiteshew, Michael [mailto:[log in to unmask]]
Sent: Wednesday, February 06, 2002 3:02 PM
To: [log in to unmask]
Subject: Re: [TN] Torque requirement


Peter,
        That question is essentially unanswerable in this format. The torque
required to keep a fastener in place is a function of the material
properties of the fastening system and the shock and vibration loads that
system will see. You really need to see a mechanical engineering structural
analyst to get the answer you need.

Michael Hiteshew
Lockheed Martin NE&SS Marine Systems
410-682-1259


-----Original Message-----
From: peter lee [mailto:[log in to unmask]]
Sent: Wednesday, February 06, 2002 2:34 PM
To: [log in to unmask]
Subject: [TN] Torque requirement


Hello,

Can anyone provide some general guidelines on the
torque requirement for mounting and fastening common
hardware onto FR4 materials with threaded steel
fasteners, lock washers and bolts?

Any table with starting values for common sizes and
screw types would be greatly appreciated.

Rgds,
Peter

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