YHM THREAD PROTECTOR 556 1/2-28 .920 OD SS

The Yankee Hill Machine Thread Protector 556 1/2-28 .920 OD in stainless steel is a simple, rugged solution for protecting your AR-15 or similar rifle barrel threads when you're running the gun naked—no suppressor, compensator, or other muzzle device installed. Bare threads are vulnerable to dings, corrosion, and crud that can make future muzzle-device installation frustrating or impossible. This is the kind of small-but-essential item that separates a shooter who takes care of their kit from one who doesn't.

Machined from stainless steel, this thread protector is built to last and won't rust or corrode in storage or field conditions. The .920 OD (outer diameter) spec and 1/2-28 thread pitch fit standard 5.56/.223 rifle barrels, making it compatible with most modern AR-pattern rifles and other platforms using this common thread size. It's not fancy—it doesn't need to be—it just screws on and does its job.

Whether you're between suppressors, testing a new barrel, or just protecting your threads during transport and storage, this thread protector costs almost nothing compared to the expense of a damaged barrel or the headache of trying to install a muzzle device on compromised threads. Keep one in your range bag, your truck, or your parts drawer.

Key Features

• Stainless steel construction resists corrosion and wear
• Protects critical barrel threads from damage during storage and transport
• Simple screw-on design—no tools required
• Fits 5.56/.223 barrels with 1/2-28 thread pitch

Specifications

Frequently Asked Questions

What barrel threads does this fit?

The Yankee Hill Machine thread protector is designed for 5.56/.223 barrels with 1/2-28 thread pitch—the standard on most modern AR-15s and similar rifles. Check your barrel's thread spec before ordering to ensure compatibility.

Will this protect my threads from rust and corrosion?

Stainless steel resists rust and corrosion better than bare steel, but the main benefit is physical protection—keeping your threads clean and undamaged while a muzzle device isn't installed. It also prevents dirt and moisture from accumulating directly on the threads.

Can I use this long-term or is it just temporary?

There's no reason not to keep it on indefinitely while you're not running a suppressor, compensator, or other muzzle device. Many shooters leave it installed between range trips or during storage to maintain thread integrity.