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Silencer Common Barrel Thread Patterns

February 2, 2016

by Silencer Central

Barrel Threads

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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 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

.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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