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Silencer Common Barrel Thread Patterns

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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

5.56mm (.223)
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 pitch7.62mm (.308)
5/8×24 is the most common thread for 7.62mm/.308 weapons
Sako TRG uses the M18x1 thread pitch
Accuracy International uses the M18x1.5 thread pitch
AK-47s use the M14x1LH thread pitch

.338LM
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

.50 BMG
1” X 14 tpi – McMillian TAC-50, Armalite AR50
7/8″ x 14 tpi – All Barretts & EDM

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