The GrovTec Crush Washer (GrovTec part no. GTHM319) is a five-pack of 1/2-28 threaded crush washers sized for .223/5.56 AR-15 barrels. GrovTec machines them from steel and finishes them in black nitride for corrosion resistance that holds up to routine cleaning and range use. A crush washer like this sits between the barrel shoulder and a muzzle device, compressing as the device is torqued down so the device times up straight without over- or under-tightening the threads. Selling them in a five-pack means a shooter always has a fresh washer on hand for the next muzzle device swap instead of reusing one that’s already been crushed.

Key Specifications

• Sized for 1/2-28 threaded barrels.
• Fits .223/5.56 caliber AR-15 barrels.
• Machined from steel for reliable crush and clamping force.
• Finished in black nitride for corrosion resistance.
• Compresses to correctly torque and time a muzzle device onto the barrel.
• Sold as a 5-pack of individual-use washers.
• Weighs about 0.065 lb each, adding negligible bulk at the muzzle.

Frequently Asked Questions

Can I reuse a crush washer? No, a crush washer is designed to deform once to lock a muzzle device in place; a fresh washer should be used each time a device is installed.

What barrel thread does this fit? It’s sized for 1/2-28 threaded .223/5.56 AR-15 barrels.

Why does the washer need a black nitride finish? The nitride finish resists corrosion and wear at the muzzle, where washers see the most heat and fouling.

Buy the GrovTec .223/5.56 Crush Washer 5-Pack

Keep spare crush washers on hand for your next muzzle device swap with this pack from GrovTec in our AR muzzle devices selection. Order it from our Lubbock, Texas gun shop for fast, direct shipping right to your door.