FIREARM BARREL THREAD PITCHES FOR SILENCER USE
Barrel Thread Pitches & Sizes | Firearm Threading Reference
Hopefully this reference list of common barrel thread pitches and sizes helps answer your questions. It is not comprehensive, and there are exceptions and model-specific variations. Please let us know if you find an error or have an addition.
Barrel thread specifications are commonly expressed by thread pitch or threads per inch (TPI), along with the thread diameter and direction. Always verify the manufacturer's specifications before selecting a muzzle device, suppressor mount, adapter, or other threaded accessory. A matching thread specification does not by itself guarantee compatibility. Barrel shoulder geometry, bore alignment, caliber rating, and the specific mounting system also matter.
Important abbreviations:
M = metric (inches are implied when there is no metric abbreviation)
RH = right hand (RH is implied when there is no abbreviation)
LH = left hand
10MM
9/16x24
12GA
M22x.75 RH (Saiga 12)
.22LR/.22MAG/.17HMR
1/2x28
M8x0.75 RH (Walther P22, Colt Gold Cup Trophy, S&W M&P22, except Compact)
9MM
1/2x28
1/2x36 (common on AR rifles, Tavor)
M13.5x1
M13.5x1 LH (Sig, Glock, H&K, B&T)
M18x1 (pre 2016 CZ)
9/16x24 RH (some HK 94 and MP5 variants)
.40S&W
5/8x24
9/16x24
M13.5x1 LH (Sig)
M14.5x1 LH (HK, Glock)
M16x1 LH (KRISS Vector)
.45ACP
.578x28
M14.5x1 LH (HK)
M16x1 LH (some HK, Glock)
M16x1 RH (some HK)
5.56MM/.223/5.45
1/2x28
M15x1 (HK)
M24x1.5 RH (some AK rifles)
9/16x24 RH (pre-2009 Ruger Mini-14)
1/2x28 (2009 and later Ruger Mini-14)
M13x1 LH (Steyr Aug)
M13x1 RH (Galil)
7.62MM/.308/.300BLK/.300WM/.338
5/8x24
M14x1 LH (common on AK rifles)
M15x1 (HK)
M24x1.5 RH (other AK rifles)
.595x32 (Springfield M1A SOCOM)
M13x1 RH (Galil)
5/8x24 (newer IWI Galil Ace)
M18x1 (Sako, Tikka)
M18x1.5 (Accuracy International)
3/4x20 (Barrett 98B)
3/4x24 (Desert Tactical .338)
.338LM
5/8x24
M18x1.5 RH (Accuracy International)
.350 Legend
1/2x36
1/2x28
11/16x24
.450 Bushmaster
11/16x24 (other variations exist)
5/8x32
.50BMG
1x14 (Armalite, McMillan TAC-50, AR450)
7/8x14 (Barrett, EDM)
3/4x20
3/4x24
6.5 Creedmoor
5/8x24
Accuracy International, SAKO and Desert Tactical Arms utilize non-standard thread pitches. Contact them directly for questions. EU-based manufacturers such as Sig Sauer, Glock and HK often utilize metric threads.
This reference is not comprehensive and may not reflect every model, generation, production year, or manufacturer change. Thread specifications can vary between otherwise similar firearms. Always verify the specifications for your exact firearm with the manufacturer or a qualified gunsmith before selecting a muzzle device, suppressor mount, adapter, or other threaded accessory.
Page last updated 08/20/2026
