Yankee Hill Machine YHM 3-Lug Adapter | YHM-2050

The Yankee Hill Machine HD 3-Lug Adapter (YHM-2050) is a quick-attach mounting hub designed to add strength and durability to 3-lug equipped firearms. The adapter uses a fully enclosed assembly with a mounting interface machined from 17-4 stainless steel and an aluminum body to resist wear under repeated installation and removal. It is HUB compatible and uses the HK tri-lug interface, enabling replacement of standard 1-3/8×24 mounts. Typical applications include mounting compatible sound suppressors on pistols and pistol-caliber carbines (PCCs) and providing a long-wearing attach point for high-cycle use.

Product Specifications

• The manufacturer is Yankee Hill Machine.
• The model/part number is YHM-2050.
• The UPC is 841812101673.
• The mount fits 1.375X24 (commonly referenced as 1-3/8×24) threads.
• The interface uses the HK tri-lug quick-attach pattern and is HUB compatible.
• The construction is Aluminum and 17-4 Stainless Steel.
• The listed finish is Matte Black / Melonite.
• The package dimensions are 2.15 x 5.20 x 8.10 (as provided).
• The listed weight is 0.4.
• Included tools/features list a 3/4″ open-ended wrench and a 1/2″ torque wrench.
• The product type is listed as a Mount for suppressor accessories.
• An additional feature notes it fits 1-3/8″x24 tubes.
• Another listed feature indicates for handgun calibers only.
• The item is described as heavy duty and intended for high-cycle service.
• Shipping restriction: no direct ship to California (per supplied data).

This adapter is engineered for users who need a robust, repeatable quick-attach interface. Its combination of aluminum body and 17-4 stainless steel mating surfaces reduces wear on components that see frequent removal and installation, and the HK tri-lug interface keeps compatibility with a wide range of HUB-style suppressor mounts. The YHM-2050 is a practical choice when upgrading a 1-3/8×24 mount for increased longevity in demanding use cases.