The Yankee Hill Machine .578-28 .650 OD Thread Protector is a steel cap that screws onto a pistol barrel to protect the threads whenever a muzzle device is not installed (brand part no. YHM-3426-B). Made in the USA by Yankee Hill Machine, it has a .650-inch outside diameter and a black plated finish. Threaded pistol barrels pick up dings in a range bag or holster, and a burr on the first thread can keep a brake or suppressor mount from seating. A protector between range sessions keeps that thread true. This one is made for the .578-28 pattern.

Key Specifications

• The thread pattern is .578-28, so it only fits barrels cut to that pitch and keeps the muzzle threads clean and undamaged.
• The outside diameter is .650-inch, the size YHM lists for this thread, which sets how the protector sits against the barrel.
• The protector is made of steel, a tough choice for a part that is threaded on and off many times.
• The finish is black plated, and the same thread and diameter is also offered by the maker in stainless.
• It is intended for pistol barrels, protecting the threads when no brake, flash hider or suppressor mount is fitted.
• It is made in the USA by Yankee Hill Machine.

Frequently Asked Questions

Which barrel thread does this protector fit? It fits .578-28 barrel threads and has a .650-inch outside diameter. YHM makes separate protectors for 1/2×28, M13.5×1 LH, 9/16×24 and M16x1 LH pistol threads, so confirm your barrel before ordering.

What is a thread protector for? It prevents damage to the threads of your pistol barrel when a muzzle device is not installed.

Buy the Yankee Hill Machine Pistol Thread Protector, .578-28, .650 OD, Black

A bare thread is the first thing to get damaged on a threaded pistol, so a spare protector in the range bag is simple insurance. Add it to your order with other Class 3 parts and accessories from our Lubbock, Texas gun shop for fast, direct shipping.