Silencer Common Barrel Thread Patterns
February 2, 2016
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Barrel Threading Common Questions.
What do the threading abbreviations mean?
These are more common for handguns, not rifles…
- LH- Left Hand (as an example – M13.5×1 LH means the threads are backwards from what you typically expect. This thread pitch would require righty-loosey, lefty-tighty…)
- RH- Right Hand (as an example – M16x1RH means the threads work how you typically expect (righty-tighty…). If there is no LH or RH designation – RH is the default.)
- M- Metric (for example – M13.5×1 LH means that the numbers are metric instead of standard.)
- TPI – Threads per inch
Common Calibers.22 LR, .22 MAG, .17 HMR
The standard thread for these calibers is 1/2×28.9mm
- 1/2×28 is the most common thread for 9mm weapons – both carbine and pistol.
- H&K weapons use the M13.5×1 LH thread pitch
- Sig Sauer weapons use the M13.5x1LH thread pitch .40 S&W
- 9/16×24 is the most common thread pitch for .40 cal weapons.
- H&K weapons use the M14.5×1 LH thread pitch .45 ACP
- .578×28 is the most common thread for .45 cal weapons.
- H&K USP Tactical uses the M16x1 LH thread pitch
- H&K Mark 23 (Socom) uses the M16x1 RH thread pitch
- AR-15s use the 1/2×28 thread pitch
- Steyr Aug uses the M13x1 LH thread pitch
- H&K weapons use the M15x1 thread pitch
- Ruger Mini uses 9/16×24 thread pitch 7.62mm (.308)
- 5/8×24 is the most common thread for 7.62mm/.308 weapons
- Sako TRG uses the M18x1 thread pitchAccuracy International uses the M18x1.5 thread pitch
- AK-47s use the M14x1LH thread pitch
- 5/8×24 is the most common thread for .338LM weapons
- Sako TRG uses the M18x1 thread pitch
- Accuracy International uses the M18x1.5 thread pitch
- Desert Tactical Arms uses the 3/4×24 thread pitch
- 1” X 14 tpi – McMillian TAC-50, Armalite AR50
- 7/8″ x 14 tpi – All Barretts & EDM