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Running a threaded barrel with a metric 13.5×1 LH pitch and a Sidewinder suppressor? This is the piston that ties the two together. Yankee Hill Machine builds this 9mm Sidewinder piston from 17-4 PH stainless steel, the same tough, heat-treatable alloy you want in a part that lives inside a booster assembly and takes a beating every time the action cycles. It measures 1.950 inches long, weighs a scant 1.5 ounces, and is made right here in the USA.
The 13.5x1mm left-hand thread pattern shows up on a lot of European-style 9mm pistol barrels, especially factory threaded barrels from makers like HK and CZ, along with plenty of aftermarket options. If your barrel wears that metric left-hand pitch, a standard 1/2×28 piston simply will not thread on. Keeping a dedicated piston for each thread pattern you own means one suppressor can jump between hosts in seconds, which is a lot easier on the wallet than a second can.
On a tilting-barrel pistol, the piston is the heart of the Nielsen device, letting the barrel cycle freely under the added weight of the suppressor so your gun runs the way it should. This unit is purpose-built for the YHM Sidewinder booster system in 9mm. One thing worth flagging before you order: it is not compatible with the YHM-2055 1.375-24 Nielsen booster, so double check which booster housing your setup uses. Installation is straightforward, just swap pistons in your booster assembly, snug everything up, and confirm proper alignment before your first range trip.
If you picked up a new barrel or a second host with metric threads, going straight to the source for a factory YHM piston is the smart play. It fits and runs exactly like the one that shipped with your can, with no guesswork on tolerances.
The M13.5×1 left-hand pitch is a common metric thread found on many European 9mm pistol barrels, including factory threaded barrels from HK and CZ, plus various aftermarket barrels cut to that spec. Check your barrel's markings or documentation to confirm the thread before ordering. If your barrel is 1/2×28, YHM makes a Sidewinder piston in that pitch too.
No. Yankee Hill Machine specifically notes this piston is not compatible with the YHM-2055 1.375-24 Nielsen booster housing. It is designed for the Sidewinder booster system, so verify which booster assembly your suppressor uses before you buy.
Most 9mm pistols use a tilting-barrel action, and hanging a suppressor on the muzzle adds enough weight to interfere with cycling. The piston is the moving part of the Nielsen device that decouples the can's weight during recoil so the pistol runs reliably. Swapping pistons also lets one suppressor mount to barrels with different thread patterns.
It is machined from 17-4 PH stainless steel, a heat-treatable alloy known for strength and corrosion resistance. At 1.950 inches long and just 1.5 ounces, it holds up well to repeated cycling and hot gas exposure. Like the rest of the Sidewinder line, it is made in the USA.
| UPC | 816701019117 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | YHM-3245-M |
| Package Height | 1.4 |
| Package Width | 3.3 |
| Shipping Weight | 0.1 |
| Product Type | Accessory-Silencer Accessories |
| Caliber/Gauge | 9mm |
| Length | 6 |
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