The Yankee Hill Machine Crush Washer (brand part no. YHM3080W) is a small but essential part for correctly timing a flash hider, muzzle brake, or any other muzzle device that needs to sit in a specific rotational orientation on a .308 AR rifle. Sized to a 5/8-inch inner diameter to match standard .308-platform thread pitch, this crush washer compresses as the muzzle device is torqued down, allowing the installer to index the device correctly without over- or under-tightening the connection. It’s a cheap, simple part that prevents a genuinely common installation headache.

Key Specifications

• 5/8-inch inner diameter, sized for standard .308 AR muzzle threading.
• Used to properly orient and time flash hiders, muzzle brakes, and similar devices.

Frequently Asked Questions

What is a crush washer used for? It allows a muzzle device to be torqued down and properly timed to a specific rotational orientation without over-tightening.

What inner diameter does this washer use? It’s sized to a 5/8-inch inner diameter for standard .308 AR platform threading.

Is this washer reusable? Crush washers are designed to compress once during installation; a fresh washer is generally recommended each time a muzzle device is reinstalled.

Buy the YHM Crush Washer

Order it from our Lubbock, Texas gun shop for fast, direct shipping to your door, and get your next muzzle device timed correctly the first time.

Shop more from Yankee Hill Machine and browse our full AR muzzle devices selection.