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February 2001

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 5 Feb 2001 14:18:01 -0500
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Ken,

We use some threaded swage in standoffs on our boards.  Given the "roll
form" die set we see no splitting or cracking.  However, when someone
inserts these standoffs without the proper dies the barrel always splits and
looks really nasty.  Once roll formed they are usually soldered into the
board.  I have found that even with the serrated standoffs you can't apply
much torque to the screw.  Hence these are usually only used for mounting
the boards or for 2-56 or 4-40 screws which don't get much torque.

For applications of terminating wires on circuit boards we use solder screw
terminals by Zierick.  Specifically part numbers 731 and 928-no-stake.

Mfg info;
Zierick
Radio Circle,
Mt. Kisco, NY  10549
800-882-8020
www.zierick.com <http://www.zierick.com>

I hope this helps.

Phil Nutting
Manufacturing Engineer
Kaiser Systems, Inc.
High Voltage Power Supplies That Work(tm)
126 Sohier Road
Beverly, MA 01915
ph: 978-922-9300
fx: 978-922-8374
[log in to unmask]

-----Original Message-----
From: Ken Bloomquist [mailto:[log in to unmask]]
Sent: Monday, February 05, 2001 1:57 PM
To: [log in to unmask]
Subject: [TN] Standoffs


Hi Technetters,

I have a question on threaded standoffs, swaged into printed wiring boards,
that are used for mounting wire lugs and chassis mounting. I'm interested in
both roll swaged and flared flange both soldered and non-soldered.

Using the guidelines of J-STD-001, do the same rules for splits and cracks
apply to standoffs as do for bifurcated and turret terminals? In discussions
with numerous standoff manufacturers they tell me that these parts WILL
split but do not affect form, fit or function. J-STD-001 seems to be
concerned with entrapment of processing fluids and does not address
standoffs.

How do others handle these type of components especially regarding splits
and cracks that extend into the shank?

Ken Bloomquist
General Dynamics
Ordnance and Tactical Systems
Aerospace Operations

P.O. Box 97009
Redmond, WA 98073-9709
425-885-5000
 <mailto:[log in to unmask]> [log in to unmask]
http://www.gd-ots.com/aehome.html <http://www.gd-ots.com/aehome.html>

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