This is what we use for electronic assembly items including PWA hardware.
Fasteners are all 300 series stainless steel 18-8 composition.  It is NOT
intended to cover torquing values for electrical parts such as stud-mounted
diodes, EMI filters, or switches.

SCREW SIZE      TORQUE  TOLERANCE
2-56            32 in. oz.              ±4 in. oz.
4-40            5.5 in. lbs.    ±.5 in. lbs.
6-32            10.0 in. lbs.   ±1 in. lbs.
8-32            20.0 in. lbs.   ±1 in. lbs.
10-32           30 in. lbs.             ±2 in. lbs.
¼-20          75 in. lbs.             ±4 in. lbs.
¼-28          95 in. lbs.             ±5 in. lbs.

> Rainer G. Blomberg
> Honeywell -Space Systems Clearwater
Staff Production Engineer
> 13350 US Hwy 19 N MS 802-3
> Clearwater, FL 33764-7290
(727) 539-5534 Phone
(727) 790-8738 Pager
(727) 539-4469 Fax
e-mail: [log in to unmask]



-----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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