Prevailing torque external fasteners 1

[baskargk]

Can anybody provide me an input on prevailing torque, external fastener for different nut applications.

Thanx for ur input.
baskar

 

[CoryPad]

Standard machine screw with polymer patch or thread forming screw (e.g. Taptite). The latter is preferred over the former.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Torquester]

You will likely have more options at less expense if you consider having the prevailing torque element within the nuts rather than the bolts.

 

[Tunalover]

Try locknuts per MS21044 and MS21048. These have nylon locking elements.


Tunalover

 

[Tunalover]

My mistake: I said MS21048 when I should have said MS21043.

Tunalover

 

[Kenneth]

tunalover:

MS21043 nuts do not have a nylon locking element. They are all-metal (crimped/deformed thread) self-locking nuts. (See:

http://assist.daps.dla.mil/docimages/0001/31/43/21043E.PD8)

 

[Tunalover]

Kenneth-
Thanks for the correction. I have the right spec number at work but our IT Dept blocks people from posting from there. Imagine that: employees participating in public forums share and give knowledge with his peers! We'll have none of that!



Tunalover

 

[Tunalover]

baskargk-
The spec for the reduced height locknut with plastic locking element is MS21083. Sorry for the confustion.



Tunalover

 

[MintJulep]

External thread prevaining torque fasteners are covered by:

MIL-DTL-18240
IFI 124
NAS 1283
MS 15981

See

http://www.longlok.com/

The downloadable handbook is quite informative. MIL-DTF-18240 is also available there for download.