Thread pitch reference

Rangerwalker71

Rangerwalker71

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Thread Pitch Reference



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.

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

.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 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


Just FYI. Thought I would pass it on. Hope it helps someone
 
as a point of reference...
1/2x28 rimfire suppressor threads are not the same as 1/2x28 hand gun or rifle suppressor threads.

 
Last edited:
Originally Posted By: cbass16as a point of reference...
1/2x28 rimfire suppressor threads are not the same as 1/2x28 hand gun or rifle suppressor threads.


Is that due to the cross-section or profile of the groove/peaks ? ?
 
Originally Posted By: Bob_AtlOriginally Posted By: cbass16as a point of reference...
1/2x28 rimfire suppressor threads are not the same as 1/2x28 hand gun or rifle suppressor threads.


Is that due to the cross-section or profile of the groove/peaks ? ? Neither. The threads themselves are identical. It's the length of thread that is different.

If you try to thread a rimfire suppressor, onto your standard threaded AR...it will not thread on on the way. It won't "shoulder". Basally, the threads on the suppressor are not deep enough for it to thread all the way onto the barrel. It's this way by design.
Rimfire suppressors don't need as many thread engagement points and you wouldn't want to try running a .22lr suppressor on a 5.56 rifle.

Rimfire threads are usually only around .4"-.5' where pistol and center fire are around .6"-.7"
Depending of course on who the smith is and the manufacturers recommendations.

Now, you CAN buy spacers to fill that gap because a lot of factory threaded 22lr barrels are actually threaded for brakes or mock suppressors that use standard 1/2x28 threads. When you go to thread on your rimfire can, and realize it doesn't thread on all the way, it makes people wonder.
Places like SilencerCo sell them...but if you're having your gunsmith do the threading, just make sure that they know if it's for a rimfire suppressor or something else.
SilencerCo Spacer
 
Originally Posted By: Rangerwalker71Just talked to my GS.
Rimfire is .400 depth
Pistol or centerfire .600.


Depends on the manufacturer of the suppressor...but yes...that's a safe bet.
 
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