Recommended Torque Value(s) for Small Fastners?
2

Question

Recommended Torque Value(s) for Small Fastners?

MrEd (Electrical)

(OP)

20 Sep 02 12:13

Can someone direct me to reference table which list the recommended torque values for small, stainless steel installation or mounting hardware when mounting 6061 Aluminum Electronic part(s) into Military Electronic Systems. Application environments can range from Ground Fixed, Ground Mobile, Naval and Airborne, etc.

The size of mounting hardware; we typically use with our products is in the 6-32, 8-32 and 1--32 UNC-2B size range

MrEd (Electrical) · Answer 1 · 2002-10-07 11:33:08

Mil-Hdbk-60 dated 12 March 1990 which replaced Appendix A12 of Fed-Std -H28; stipulates torque values from 0.190 upto 1.5 inch diameter fastners or hardware.

However, I'm still in need of recommended torque values for hardware fasteners in the smaller size(s) of 0-80, 2-56, 4-40, 6-32 and 8-32 UNC-2B, etc.?

Any Ideas?

Please can anyone help?

Humbly,

Mr. Ed

MASSEY (Mechanical) · Answer 2 · 2002-10-23 18:03:57

Mr. Ed,

If I was trying to find any standards for fasteners, I would ask Ralph Shoberg at RS Technologies Ltd.

website: rstechltd.com
phone #248-888-8260.

If you telephone, ask for Ralph Shoberg or Jeff Blumenthal.

Good Luck.

tuspi (Aerospace) · Answer 3 · 2004-03-25 14:46:09

Hi MrEd,
Did you have any success in your search?

I'm asking you becose I use the same type of hardware as you do and I'm very interested. More, I use metric hardware as well and I'm interested in torque values for it too.

Can you help?
Thanks
tuspi

Rod23 (Mechanical) · Answer 4 · 2004-03-31 13:39:06

www.engineersedge.com/torque_table_sae.htm covers #2-56 and up, in aluminum 2024-T4 and other materials. Should get you in the ball park.

Rod23

MrEd (Electrical) · Answer 5 · 2004-03-31 18:18:10

In the absence of any specific standard and informaton, we developed the attached table of information regarding torque values for small fastner.

Attachment:

Comment:

Upon reviewing the attached you might agree with what our grandfathers told us was a good rule of thumb for tightening fastners.

That is:

Finger Tight plus ~ 1/2 Turn more!

Tighten your fastner/nut finger tight (i.e., Head of fastner or bottoms side of a nut until it's flush against its mating or opposing surface) and then tighten it again somewhere between 1/4 and 1/2 turn past its finger tight position.

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Recommended Torque Value(s) for Small Fastners?
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