Threaded barrel o-rings - Which McMaster-Carr part number?

[dickgoesbang]

Looking to order in bulk for 9mm 1/2 x 28 and hoping not to make a big melty mess.

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[Lazyfaire]

Have never seen an O-ring on a muzzle device, but I think you are correct that they will melt from the heat.

 

[Member 34319]

In to learn more of o ring use on threads.

 

[arrowshooter]

I have been using the standard black ones for years when installing devises that are not timing sensitive and they last quite awhile if its not too big and it smooshes out. They do make some red ones that are supposed to be more heat resistent.

 

[DirectDrive]

Viton are the ones.

 

[PORSCHE928S4]

The green ones that are on the Hk barrels don't melt they are used for slide lock up but take the heat .

 

[Nwcid]

Never heard of or used them either. Following.

 

[dplev4]

Heat resistant o-rings are available and cheap on Amazon. I use one on a threaded barrel for a compensator For one of my pistols. So far it's worked fine but I also haven't put a thousand rounds through the barrel to give it a ringing endorsement. What I can say is that it was the only way I could get the compensator to stay put and tight. That said I prefer using metal shives to align and hold a compensator when I can. Rubber o-rings just happened to be the thing that worked and that was also what the manufacturer recommended. Not sure how long it would hold up on a long gun but presumably heat tolerances are well, heat tolerances, and it shouldn't matter?

 

[Member 5605]

9mm…..

If that gets hot enough…. You're running a really short barrel and shooting a lot.

Some of my factory built 9mm carbines have had them to keep the thread protector on. But that gets removed once I start using cans.

Torque, not a rubber gasket should hold the suppressor on.

$.02