Do you want to purchase muzzle brake (comensator) for your rifle and you don’t know what thread you need. We made this database to build barrel thread reference over time so users can check what thread they have and purchase right info.  That way it can serve as a reference for quickly locating how your barrel may be threaded. Remember, however, that just because your weapon may be threaded a certain way from the manufacturer – that won’t necessarily apply if you have an after-market barrel or have had the barrel threaded yourself. If you find anything in this chart that may be incorrect, please contact us.  Some abbreviations that I will use here include:

  • M=Metric (for example – M13.5×1 LH means that the numbers are metric instead of imperal. 13,5 means that diameter is 13,5mm and pitch of thread is 1mm.)
  • I = Imperial (also known as inch ur UN, UTS – Unified thread standard. It uses same 60 degree V angle as metric threads. example 1/2 28TPI means that diameter is hald of inch and thread pitch is 28 turns per one inch. The larger TPI number the more fine thread pitch)
  • LH = Left Handed (This means the threads are backwards from what you typically expect.  This thread pitch would require righty-loosey, lefty-tighty.)


.22 LR, .22 MAG, .17 HMR

The standard thread for these calibers is 1/2×28.  Please let us know if you are aware of any notable exceptions.


1/2×28 TPI 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 M13.5×1 LH thread pitch
Troy uses 1/2×36 TPI for their M5 PCC carbine
Colt AR 9mm came with a 1/2×36 TPI
Some version of Diamondback uses 1/2×36 TPI while their web page has information that thread is 5/8 x 24 TPI for their 9mm PCC carbine
CZ EVO Scorpio. Older models have 1/2 28TPI and newer models use Metric M18x1 thread
CMMG WASP 9mm barrels have the colt standard 1/2×36 TPI
CMMG’s chrome lined 9mms have a 5/8×24 TPI thread

.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


.578×28 TPI 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 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
Most of Oberland Arms AR15 use M14x1 thread

7.62mm (.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 M14x1 LH 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

Please contact us if you find mistakes or you can share your thread knowledge here.

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