The Yankee Hill Machine Sidewinder Piston in .40 S&W with a 14.5×1 left-hand thread (brand part no. YHM-3235-M) is a booster piston for the Sidewinder suppressor platform, built for .40-caliber pistol hosts threaded to the 14.5x1LH metric pattern. It lets the barrel move independently of the suppressor’s added mass, which keeps a recoil-operated .40-caliber pistol cycling reliably with a can attached. As a wear item, it can be replaced on its own as internal springs and seals age. It ships as a standalone service part, separate from the suppressor tube.

Key Specifications

• Chambered for .40 S&W, matching the pressure and bore diameter of that pistol cartridge.
• Threaded to 14.5×1 left-hand, a metric .40-caliber suppressor-ready barrel pattern.
• Built for the Sidewinder suppressor platform, allowing independent barrel movement for reliable cycling.

Frequently Asked Questions

What thread pattern does this piston use? It’s threaded 14.5×1 left-hand.

How is this different from the 9/16×24 .40 S&W piston? This version is cut for the 14.5x1LH metric thread pattern instead of the 9/16×24 pattern.

What caliber is it built for? It’s chambered for .40 S&W.

Buy the Yankee Hill Machine Sidewinder Piston, .40 S&W 14.5x1L

Order the Sidewinder Piston, .40 S&W 14.5x1L from our Lubbock, Texas gun shop for fast, direct shipping. Browse more pistol suppressor parts in our silencers and suppressed firearms category.