Will the GrovTec Jam Nut fit my .308 Win or 6.5 Creedmoor barrel?

No, this specific model (GTHM322) is precision-machined exclusively for 1/2"-28 TPI threads found on .223/5.56 and .22 LR barrels. For larger calibres utilizing standard 5/8"-24 threads, you will need the GrovTec GTHM323 model instead.

How do I install the GrovTec 1/2"-28 Jam Nut without damaging my muzzle device?

The jam nut features integrated spanner slots compatible with standard AR armorer’s wrenches. Simply thread the jam nut onto your barrel first, thread on your muzzle device to the desired timing, and then back the jam nut firmly against the device using your wrench to lock it securely in place.

Are muzzle accessories like jam nuts restricted under Australian firearm laws?

Under Australian state and territory legislation, thread-mounted accessories such as muzzle brakes, compensators, and thread-alignment hardware for Category A and B rifles are generally unrestricted components. However, sound suppressors remain strictly regulated or prohibited for general civilian ownership.

Can I use the GrovTec Jam Nut with the GrovTec G-Nite Flash Suppressor in .223 calibre?

Yes, the GrovTec GTHM322 jam nut is fully compatible with the GrovTec GTHM317 G-Nite Flash Suppressor, as both share the standard 1/2"-28 thread pitch designed for .223 and 5.56 rifle platforms.

1/2-28 Jam Nut - GrovTec GTHM322

The Grovtec Jam Nut ½-28 (GTHM322) is a machined steel firearm accessory designed to index, time, and lock muzzle devices onto threaded barrels. Engineered with a 1/2"-28 TPI thread pattern, it threads onto the barrel behind a muzzle brake, compensator, or flash hider, securing the attachment firmly against the nut. This mechanical lockup serves as a reusable alternative to single-use crush washers and eliminates the trial-and-error adjustment required when stacking peel shims. Machined in the USA with a durable black protective finish, it features wrench flats compatible with standard AR armorer's wrenches for straightforward field installation and maintenance.

Key Features

1/2"-28 TPI Threading: Matches standard barrel threads for .223 Remington, 5.56×45mm NATO, and .22 LR platforms.
Reusable Mechanical Indexing: Locks and times muzzle devices securely without the physical deformation associated with single-use crush washers.
Solid Steel Construction: Made from machined steel with a durable black finish to withstand standard shooting temperatures and recoil forces.
Armorer's Wrench Compatibility: Designed with flat slots that fit standard armorer's wrenches and spanners for precise torque application.
Simplified Device Swapping: Allows quick removal, servicing, and alignment of muzzle attachments without stripping barrel threads.

Specifications

Product Name: GrovTec Jam Nut – 1/2"-28
Model / SKU: GTHM322
Thread Pitch: 1/2"-28 TPI
Calibre Compatibility: .223 Rem, 5.56mm NATO, .22 LR, and matching 1/2"-28 threaded platforms
Material: Machined steel
Finish: Black
Tool Fitment: Standard AR armorer's wrench / spanner slots
Country of Origin: USA

Who is the Grovtec Jam Nut ½-28 for?

Rifle builders and owners with 1/2"-28 threaded barrels — requires 1/2"-28 TPI threading to precisely align and index muzzle brakes or flash hiders on .223 Remington, 5.56mm NATO, or .22 LR rifles without using disposable crush washers.
Shooters frequently swapping muzzle devices — provides a reusable jam nut interface using 1/2"-28 TPI threads that allows repeated installation, timing, and removal of compensators or muzzle attachments using a standard armorer's wrench.

Less suitable for: Barrels with larger imperial thread patterns such as 5/8"-24 TPI (.308 Win / 6.5 Creedmoor) or metric threads (such as M14×1, M15×1, or M18×1), which require dedicated 5/8"-24 jam nuts or metric-specific muzzle alignment shims.

SKU	GT40837LP
Model #	GTHM322
Brand	Grovetec
Shipping Weight	1.0000kg

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Grovtec Gthm322 Jam Nut 1/2-28 Steel Black

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