The YHM Universal Rifle Suppressor Mount in M13.5×1 LH is the left-hand metric version of Yankee Hill Machine’s direct thread mount. YHM developed the mount to convert existing suppressors from other manufacturers so they use your barrel threading as a direct mounting system, and the design is simple enough that there is very little chance of installing it incorrectly. It threads onto a suppressor with a 1.375×24 mounting interface and is made from heat-treated 17-4PH stainless steel with a Melonite QPQ finish. For a rifle with an M13.5×1 left-hand muzzle, this is the version that matches.

Key Specifications

• The barrel thread is M13.5×1 LH, a left-hand metric pitch that sets this version apart from the 1/2×36 and 5/8×24 mounts.
• The suppressor side uses a 1.375×24 mounting thread, so the mount ties into a HUB-style suppressor interface.
• Material is heat-treated 17-4PH stainless steel, which gives the mount strength for repeated threading.
• The finish is Melonite QPQ, a hard surface treatment that resists wear and corrosion.
• Weight is 1.7 ounces, keeping the added mass at the back of the suppressor small.

Frequently Asked Questions

Is this a left-hand thread? Yes. The barrel thread is M13.5×1 LH, and LH stands for left-hand, so it threads on in the opposite direction from a standard right-hand thread.

How do I install it on a suppressor? Take the existing mount mechanism off the suppressor, thread this universal mount on with a 3/4-inch open-end wrench, then thread the two-piece suppressor onto your barrel.

Buy the YHM Universal Rifle Suppressor Mount, M13.5×1 LH

Metric left-hand threads are easy to confuse with other muzzle threads, so this listing names the M13.5×1 LH pitch clearly. Order it from a Lubbock, Texas gun shop that ships fast, and see more suppressor parts and accessories for your setup.