Yankee Hill Machine Co Thread Protector, Pistol, 9MM, 1/2X28, .570 Outer Diameter, Matte YHM-3418-B

A threaded 9mm pistol barrel needs protection when you're not running a suppressor, brake, or flash hider—and that's where the Yankee Hill Machine Co 9MM Pistol Thread Protector comes in. This simple but essential accessory screws onto your 1/2x28 threads to shield them from dings, debris, and corrosion while you're swapping muzzle devices or just carrying your pistol between range sessions. Built from stainless steel with a matte finish, it'll hold up to regular use without adding bulk or weight to your setup.

The knurled exterior is more than just looks—those grooves give you solid purchase when hand-tightening or removing the protector, so you won't fumble with a wrench or slip off the threads in frustration. At .570 inches OD, it fits the 1/2x28 bore profile without interfering with holsters, magazines, or your grip. Whether you're a tinkerer who rotates between suppressors and brakes, or just want to keep your barrel threads pristine during long stretches without a muzzle device, this is a no-fuss, no-cost insurance policy.

Yankee Hill Machine is known for straightforward, reliable parts—no over-engineering, no hype. This thread protector does exactly what it says: keeps your threads safe and accessible. It's one of those small details that separates shooters who maintain their gear from those who let it slide.

Key Features

• Stainless steel construction resists corrosion
• Knurled exterior for easy hand-removal without tools
• Matte finish hides wear and blends with most pistol builds
• Protects 1/2x28 threads from damage when swapping muzzle devices
• Compact .570 OD design—won't snag holsters or furniture

Specifications

Frequently Asked Questions

Will this fit my 9mm pistol barrel?

This protector is sized for 1/2x28 threads, which is the standard for most 9mm pistols. Verify your barrel's thread pitch before ordering—if your barrel is threaded 9/16x24 or .578x28, you'll need a different size. Check your barrel stamp or suppressor manual if unsure.

Can I leave this on while shooting, or is it just storage?

It's designed as a protective cap when a muzzle device isn't installed. We recommend removing it before shooting to avoid any potential issues—it's not rated for firing.

How do I install and remove it?

Simply hand-tighten it onto your clean, dry barrel threads. The knurled surface gives you plenty of grip, so you shouldn't need tools. To remove, grip and turn counterclockwise—hand-tight removal is the whole point.

What's the difference between this and other thread protectors?

This YHM protector is stainless steel with a knurled design for reliable hand removal. The matte finish is low-profile, and the .570 OD fits snugly on standard 1/2x28 bores without hanging past your muzzle.