The GrovTec Crush Washer (brand part no. GTHM320) is a 5-pack of black nitride steel crush washers sized for .308-caliber rifle barrels with 5/8-24 tpi threads. Crush washers seat between a muzzle device and the barrel shoulder, deforming slightly as you torque the device down so it lands index-correct without needing a witness mark or timing shims. GrovTec machines these from quality steel and finishes them in black nitride to resist corrosion and match most muzzle device finishes. Selling five to a pack means you always have spares on hand for mounting a new brake, flash hider, or thread protector without a special order.

Key Specifications

• 5/8-24 TPI Thread matches standard .308-caliber muzzle device thread pitch.
• Black Nitride Finish resists corrosion and matches most muzzle device finishes.
• Steel Construction holds up to the torque of mounting a muzzle device.
• .308 Caliber Rifle Fit is sized for standard .308-pattern barrel threads.
• 5-Pack Quantity keeps spares on hand for future muzzle device swaps.

Frequently Asked Questions

What does a crush washer do? It seats between the muzzle device and barrel shoulder and deforms slightly under torque so the device indexes correctly without shims.

How many washers come in a pack? Five.

Buy the GrovTec Crush Washer

Stock up on GrovTec Crush Washers from our gun parts and accessories lineup for your next muzzle device install. Order online and we will ship it straight to your door from our Lubbock, Texas gun shop.