I bought the M4-72 brake in .308. I got the accuwasher system and got it installed, level, and hand tight. The directions say to torque to 20-30ft/lb. I've done research and I've not seen any torque wrench that would be able to torque a brake. Any suggestions?
Installing a muzzle brake - how to torque
- Thread starter Teh_Sp00ky
- Start date
You have to use a crow foot with the correct drive for the wrench your using.
Get a Crow's foot wrench head of the proper dimensions to fit the flats of your brake and with the proper sized square cut for your torque wrench. eg. 3/8 or 1/2".
I use the method my German ancestors used: Goodentight.
When using a crowsfoot, I'd go with the 20 lbft, as the extension of the lever will increase the actual torque applied.
If you keep the wrench handle at 90-degrees to the crows foot opening, the difference in torque values are negligible and you don't have to compensate.
Or if you really want to do it straight on (or have to due to some reason) use this equation in the link to calculate the difference. https://www.engineersedge.com/manufacturing_spec/torque_wrench_1.htm
Or if you really want to do it straight on (or have to due to some reason) use this equation in the link to calculate the difference. https://www.engineersedge.com/manufacturing_spec/torque_wrench_1.htm
I'd go with the crows foot/torque wrench method that everyone has mentioned. Just wanted to add, for those that have brakes without a flat for a crows foot, I find a strap wrench is the way to go. I'll add enough layers of electrical tape around the brake to get the diameter built up enough to use the strap wrench when I have to (remove the tape after tightening obviously).
Or, tighten until you reach "gain-twist" level, then back off 1/4 turn.
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