Common Muzzle Thread Reference

Do you want to purchase muzzle brake (compensator) for your rifle and you don’t know what thread to choose for the muzzle brake?

We made this database to build muzzle thread reference over time so users can check what thread they have and purchase the right product. That way it can serve as a reference for quickly locating how your muzzle 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 we’ll use here include:


  • M = Metric (for example – M13.5 x 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 x 28 TPI means that diameter is half 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 opposite from what you typically expect. This thread requires counter-clockwise tightening.)

Thread standards by caliber

.22 LR, .22 MAG, .17 HMR

The most common standard thread for these calibers is 1/2 x 28.
Sako Quad uses 1/2 x 20


1/2×28 TPI is the most common thread for 9mm weapons  – both carbine and pistol.
H&K weapons use the M13.5 x 1 LH thread pitch
Sig Sauer weapons use the M13.5 x 1 LH thread pitch
Troy uses 1/2 x 36 TPI for their M5 PCC carbine
Colt AR 9mm came with a 1/2 x 36 TPI
Some versions of Diamondback use 1/2 x 28 TPI while their web page has information that thread is 5/8 x 24 TPI
CZ Scorpion EVO carbine length have 1/2 x 28 TPI and those with 8" barrel length models use Metric M18x1 thread
CMMG WASP 9mm barrels have the colt standard 1/2 x 36 TPI
CMMG’s chrome lined 9mms have a 5/8 x 24 TPI thread

.40 S&W

9/16 x 24 is the most common thread pitch for .40 cal weapons.
H&K weapons use the M14.5 x 1 LH thread pitch


.578 x 28 TPI is the most common thread for .45 cal weapons.
H&K USP Tactical uses the M16 x 1 LH thread pitch
H&K Mark 23 (Socom) uses the M16 x 1 thread pitch

5.56mm (.223)

AR-15s use the 1/2 x 28 thread pitch
Steyr Aug uses the M13 x 1 LH thread pitch
H&K weapons use the M15 x 1 thread pitch
Ruger Mini uses 9/16 x 24 thread pitch
Most of Oberland Arms AR15 use M14 x 1 thread

6.5mm (.264)

Tikka T3x CTR 6.5 Creedmoor uses 5/8 x 24 thread pitch

7.62mm (.308)

5/8 x 24 is the most common thread for 7.62mm/.308 weapons
Sako TRG uses the M18 x 1 thread pitch
Accuracy International uses the M18 x 1.5 thread pitch
AK-47s use the M14 x 1 LH thread pitch


5/8 x 24 is the most common thread for .338LM weapons
Sako TRG uses the M18 x 1 thread pitch
Accuracy International uses the M18 x 1.5 thread pitch
Desert Tactical Arms uses the 3/4 x 24 thread pitch

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

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