cvasqu03 21 Posted September 24, 2013 Report Share Posted September 24, 2013 I'm planning out two conversions, and three barrel therading projects. I have three muzzle breaks, but will probably want to leave one with just a thread protector so I can use it with a suppressor. Anyway, my question is about the split ring crush washer I've seen some people use. Where does one get the split ring washer to put under a threaded brake to keep it secure? I haven't seen it listed in any place under conversion parts but maybe I'm looking in the wrong place. I also heard some people say they just bought a spark plug or something, which size woudl that be? If the washer is available at the hardware store, what's the correct measurement? Quote Link to post Share on other sites
TonyRumore 1,332 Posted September 24, 2013 Report Share Posted September 24, 2013 I believe DPMS sells them for the AR-10's. Those muzzles are 5/8" so it would be bit large for a 14mm rifle, but would probably still work. Quote Link to post Share on other sites
Rhodes1968 1,638 Posted September 24, 2013 Report Share Posted September 24, 2013 dinzag used to sell them iirc. Quote Link to post Share on other sites
ChileRelleno 7,071 Posted September 25, 2013 Report Share Posted September 25, 2013 (edited) I prefer a standard crush washer. This is not a split ring washer, this is a cone washer, it will however generally allow for indexing of most attachments. Carolina Shooters Supply http://www.carolinashooterssupply.com/product_p/css-crushwasher-rifle.htm If you want a split ring washer, you can purchase a 5/8" ID ( yes, it works) split ring washer at almost any hardware store. They even come in good'ol black. Edited September 25, 2013 by ChileRelleno Quote Link to post Share on other sites
BigChongus 765 Posted September 25, 2013 Report Share Posted September 25, 2013 CNC Warrior sells them, too. Quote Link to post Share on other sites
bert7.62x39 10 Posted September 26, 2013 Report Share Posted September 26, 2013 I just threaded my 7.62x39 Saiga barrel using the crush washer from www.carolinashooterssupply.com that ChileRelleno mentioned and installed a slant brake. I put the "cone" side of the crush washer toward the buttstock and the "bowl" or more flat-looking recessed side toward the muzzle. Also, I had to make about a 1/3 turn against the crush washer to get mine properly indexed. I had to torque it some but it's secure. I've read that you don't really want to do more than a 3/4 turn with a crush washer because it can put too much stress on the barrel or threaten the threads due to excessive torqueing or something along those lines. If you hand-tighten your muzzle device against the crush washer and need more than a 3/4 turn to get it properly indexed, maybe try a different washer (peel, split)or file/dremel/grind off some thickness of your crush washer. Quote Link to post Share on other sites
Xpur3L0g1cX 3 Posted October 19, 2013 Report Share Posted October 19, 2013 I used a 14mm crush washer off of a spark plug Quote Link to post Share on other sites
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