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Lock Plugs 1

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Eddieeeeeee

Mechanical
Nov 18, 2010
3
I am looking for a specification, standard or industry guidline that documents the required diameter of a lock plug based on thread pitch.

Can someone post a link to a site where I can view or down-load a chart or document?

Thanks in advance
 
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I wasn't aware they were required to be any particular size.
... or round, for that matter.

Perhaps we are talking about different things?



Mike Halloran
Pembroke Pines, FL, USA
 
Hi Mike,

There are definitely requirements. I have a very old and fragile document but very little of it is legible.
I can only make out two of the entries:
THREAD PITCH PLUG DIA
80 .031
32 .062

That's all I've got.
 
Relevant standards are:

MIL-DTL-18240: Performance specification for prevailing
torque type fasteners performing to +250°F — both external
and internal threads. Defines patch, strip, and pellet type configurations
and offers 5 cycle reusability and torque performance
requirements.

IFI 124: Industrial Fastener Institute commercial performance
standard and test procedure for prevailing torque type fasteners
using non-metallic locking elements. Offers 5 cycle reusability
and torque performance requirements.

IFI 524: Same as IFI 124, but for metric size thread forms.
NAS 1283: Design standard for male threaded self-locking
fasteners. Incorporates MIL-DTL-18240 performance standards
and test requirements by reference.
MS 15981: Design standard for design and usage limitations
of externally threaded self-locking fasteners. Incorporates MILDTL-
18240 performance standards and test requirements by
reference.

MIL-F-8961: Design and performance standard for high temperature
(450°F + 1200°F) externally threaded self-locking
fasteners. Offers 15 cycle reusability and torque performance
requirements.

MIL-I-45932: Design and performance standard for thin wall,
self-locking screw thread inserts. Includes design, performance
and torque requirements for integral locking device type, both
metallic and non-metallic.

MIL-S-82496A: Procurement specification for integral O-ring,
self-sealing machine screws. Offers design, performance and
test requirements for self-sealing fasteners including reusability
and minimum pressure sealing capability.
IFI 125: Industrial Fastener Institute commercial performance
and test procedure for chemically coated (pre-applied and assembly-
applied adhesive) lock screws. Offers prevailing and
breakaway torque performance criteria
IFI 525: Same as IFI 125, but for metric size thread forms.
 
Hey, thanks Mint,

That's a lot of information!

I was finally able to put together a chart that meets my needs, it is quite simply:

THREAD PITCH/PLUG DIA
80/.031
64/.031
56/.046
48/.046
40/.062
36/.062
32/.062
28/.093
24/.093
20/.125
18/.125

Once again, thank you for all the sources.

 
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