Barrel & Suppressor Thread Pitch Chart
The mount or muzzle device you use has to match the threads on your barrel. Use the charts below to look up the thread pitch by caliber, firearm or thread size, then verify it on the barrel or in the owner's manual before ordering a mount.
Quick Answers
| Caliber or Platform | Most Common Thread Pitch |
|---|---|
| 9mm | 1/2-28 RH |
| 5.56 / .223 (AR-15) | 1/2-28 RH |
| .308 / 7.62x51 (AR-10) | 5/8-24 RH |
| .300 BLK, 6.5 Creedmoor | 5/8-24 RH |
| .22 LR | 1/2-28 RH |
| .45 ACP | .578-28 RH |
| .40 S&W | 9/16-24 RH |
| AK-47 / AKM (7.62x39) | M14x1 LH |
| AK-74 (5.45x39) | M24x1.5 RH |
A thread pitch such as 1/2-28 means the thread is 1/2 inch in diameter with 28 threads per inch. Metric threads, such as M13.5x1, use metric measurements. RH means right-hand and tightens clockwise. Most US barrels use right-hand threads. LH means left-hand and tightens counterclockwise; it is common on many HK, Sig and AK barrels.
.22 LR Rimfire Thread Pitch
.22 LR rimfire suppressors use 1/2-28 threads. If your .22 barrel uses a different thread, you'll need an adapter.
- Walther P22 / S&W M&P22 Adapter: fits the Walther P22, S&W M&P22 and Colt/Umarex 1911/22
- S&W M&P 22 Compact Adapter: fits the M&P 22 Compact
- SIG & GSG 1911 Adapter: fits SIG and German Sport Guns .22 LR 1911s
- SIG Mosquito Thread Adapter: converts the factory M9x0.75 thread to 1/2-28
Browse our thread adapters, or shop rimfire suppressors.
Thread Pitch by Caliber
For each caliber, the most common thread is listed first.
| Caliber | Thread Pitch (Firearms) |
|---|---|
| .22 LR / Rimfire | 1/2-28 RH (most common): Taurus TX22, KRISS Vector .22 M8x0.75 RH: some .22 pistols (adapter required) M9x0.75: SIG Mosquito (adapter required) |
| 5.7x28mm | 1/2-28: S&W M&P 5.7 M10x1 RH: FN Five-seveN (1/2-28 adapters available) M12x1 LH: FN PS90 |
| .380 ACP | M12x0.75: Glock 42 |
| 9mm | 1/2-28 RH (most common): Beretta 92 / M9A3 / 92X, S&W M&P9 M2.0, Sig P365, HK SP5 and MP5, CZ Scorpion EVO 3 S1, Springfield Kuna, KRISS Vector 9mm, most 9mm AR barrels M13.5x1 LH: HK USP9, Sig P226 and P320 factory threaded, Sig MPX, some Glock G17 Gen3/Gen4 threaded, some aftermarket and imported barrels 1/2-36: some 9mm AR barrels (Angstadt, MAF, Colt pattern) M12x0.75: Glock 43 and 43X |
| .40 S&W / 10mm | 9/16-24 RH (most common): most aftermarket .40 barrels, KRISS Vector 10mm and .40 M14.5x1 LH: HK .40, Glock G23 factory threaded |
| .45 ACP | .578-28 RH (most common): 1911, FNX-45 Tactical, Sig, Glock 21 factory threaded, KRISS Vector Gen 3 M16x1 LH: HK USP45, HK45T, KRISS Vector Gen 2 M16x1 RH: HK Mark 23 |
| 5.56 / .223 | 1/2-28 RH (most common): AR-15, Ruger Mini-14 Tactical, current US Steyr AUG 9/16-24 LH: FN FNC M13x1 LH: original Steyr AUG M13x1 RH: Galil ARM, SAR and AR M15x1 RH: HK33, HK93 |
| 5.45x39 | M24x1.5 RH: AK-74 |
| 7.62x39 | M14x1 LH: AK-47 / AKM |
| .300 BLK, 6.5 Creedmoor, 6.5 Grendel, .458 SOCOM | 5/8-24 RH: including the Ruger Precision Rifle in 6.5 Creedmoor |
| 7.62 / .308 | 5/8-24 RH (most common): AR-10, Ruger Mini Thirty 9/16-24 LH: FN FAL .595-32 RH: M1A / M14 M15x1 RH: HK91 / G3, PTR 91 M18x1: Tikka T3x TAC A1 .308 |
| .338 | 3/4-24: Desert Tech .338, Barrett 98B and MRAD made after January 2013 M18x1: Sako TRG 22/42 A1 in .338 Lapua Magnum M18x1.5: Accuracy International |
| .45-70 Government | 11/16-24: Marlin 1895 Dark and Trapper 5/8-24: Henry X Model |
| .350 Legend, .400 Legend, .450 Bushmaster | 11/16-24 |
Thread Pitch by Firearm
Factory thread pitches for common pistols, rifles and pistol-caliber carbines, listed A to Z.
| Firearm | Thread Pitch |
|---|---|
| 1911 (.45 ACP) | .578-28 RH |
| AK-47 / AKM (7.62x39) | M14x1 LH |
| AK-74 (5.45x39) | M24x1.5 RH |
| AR-15 (5.56 / .223) | 1/2-28 RH |
| AR-10 (.308) | 5/8-24 RH |
| AR9 / 9mm AR | 1/2-28 (most common); 1/2-36 on some barrels (Angstadt, MAF, Colt pattern) |
| Accuracy International (.30, .338) | M18x1.5 |
| Barrett 98B / MRAD (made after January 2013) | 3/4-24 |
| Beretta 92 / M9A3 / 92X (threaded) | 1/2-28 RH |
| CZ Scorpion EVO 3 S1 (threaded), Scorpion 3+ Micro | 1/2-28 |
| Desert Tech (.338) | 3/4-24 |
| FN FAL (7.62) | 9/16-24 LH |
| FN FNC (5.56) | 9/16-24 LH |
| FN Five-seveN | M10x1 RH (1/2-28 adapters available) |
| FN PS90 | M12x1 LH |
| Galil ARM, SAR, AR (5.56) | M13x1 RH |
| Glock G17 Gen3/Gen4 threaded | M13.5x1 LH |
| Glock G23 factory threaded (.40) | M14.5x1 LH |
| Glock 42, 43, 43X | M12x0.75 |
| Henry X Model (.45-70) | 5/8-24 |
| HK Mark 23 (.45 ACP) | M16x1 RH |
| HK MP5 / MP5K | 1/2-28 RH, usually under a 3-lug. MP5SD: M18x1 RH |
| HK SP5 | 1/2-28 RH, under the factory tri-lug adapter |
| HK USP9 | M13.5x1 LH |
| HK USP45, HK45T | M16x1 LH |
| HK33, HK93 (5.56) | M15x1 RH |
| HK91 / G3, PTR 91 (.308) | M15x1 RH. Some PTR barrels are 5/8-24, so check yours. |
| Kalashnikov USA KP-9 | 1/2-28 |
| KRISS Vector | .22 and 9mm: 1/2-28 RH 10mm and .40: 9/16-24 RH .45 Gen 3: .578-28 RH .45 Gen 2: M16x1 LH |
| M1A / M14 | .595-32 RH |
| Marlin 1895 Dark, Trapper (.45-70) | 11/16-24 |
| PSA AK-V (9mm) | 1/2-28 |
| Ruger Mini-14 Tactical | 1/2-28 |
| Ruger Mini Thirty | 5/8-24 |
| Ruger Precision Rifle (6.5 Creedmoor) | 5/8-24 RH |
| S&W M&P9 M2.0 (threaded) | 1/2-28 RH |
| S&W M&P 5.7 | 1/2-28 |
| Sako TRG 22/42 A1 | M18x1 in .338 Lapua Magnum; 5/8-24 in other calibers |
| SIG Mosquito (.22 LR) | M9x0.75 (adapter required for 1/2-28 suppressors) |
| Sig MPX / MPX K | M13.5x1 LH |
| Sig P226, P320 (factory threaded 9mm) | M13.5x1 LH |
| Sig P365 (threaded) | 1/2-28 |
| Springfield Kuna (9mm) | 1/2-28 |
| Steyr AUG (5.56) | Current US barrels: 1/2-28 Original AUG: M13x1 LH |
| Taurus TX22 | 1/2-28 |
| Tikka T3x TAC A1 (.308) | M18x1 |
Firearms by Thread Pitch
| Thread Pitch | Common Firearms |
|---|---|
| 1/2-28 RH | .22 LR rifles and pistols, AR-15, most 9mm AR barrels, Beretta 92 / M9A3 / 92X, S&W M&P9 M2.0, S&W M&P 5.7, Sig P365, HK SP5 and MP5, CZ Scorpion EVO 3 S1, Springfield Kuna, Kalashnikov USA KP-9, PSA AK-V, KRISS Vector .22 and 9mm, Ruger Mini-14 Tactical, current US Steyr AUG, Taurus TX22 |
| 1/2-36 | Some 9mm AR barrels (Angstadt, MAF, Colt pattern) |
| .578-28 RH | .45 ACP: 1911, FNX-45 Tactical, Sig, Glock 21 factory threaded, KRISS Vector Gen 3 |
| 9/16-24 RH | Most aftermarket .40 S&W barrels, KRISS Vector 10mm and .40 |
| 9/16-24 LH | FN FNC (5.56), FN FAL (7.62) |
| 5/8-24 RH | AR-10 and .308 rifles, Ruger Mini Thirty, Ruger Precision Rifle (6.5 Creedmoor), Henry X Model .45-70, .300 BLK, 6.5 Grendel, .458 SOCOM |
| 11/16-24 | .350 Legend, .400 Legend, .450 Bushmaster, Marlin 1895 Dark and Trapper (.45-70) |
| .595-32 RH | M1A / M14 |
| 3/4-24 | Desert Tech .338, Barrett 98B and MRAD made after January 2013 |
| M8x0.75 RH | Some .22 LR pistols (adapter required) |
| M9x0.75 | SIG Mosquito (adapter required) |
| M10x1 RH | FN Five-seveN |
| M12x0.75 | Glock 42, 43, 43X |
| M12x1 LH | FN PS90 |
| M13x1 LH | Original Steyr AUG (5.56) |
| M13x1 RH | Galil ARM, SAR and AR (5.56) |
| M13.5x1 LH | 9mm: HK USP9, Sig P226 and P320 factory threaded, Sig MPX, some Glock G17 Gen3/Gen4 threaded, some aftermarket and imported barrels |
| M14x1 LH | AK-47 / AKM (7.62x39) |
| M14.5x1 LH | .40 S&W: HK, Glock G23 factory threaded |
| M15x1 RH | HK33, HK93 (5.56), HK91 / G3 and PTR 91 (7.62) |
| M16x1 LH | .45 ACP: HK USP45, HK45T, KRISS Vector Gen 2 |
| M16x1 RH | HK Mark 23 (.45 ACP) |
| M18x1 | Sako TRG 22/42 A1 in .338 Lapua Magnum, Tikka T3x TAC A1 .308, some Blaser R8 barrels, HK MP5SD (RH) |
| M18x1.5 | Accuracy International (.30 and .338) |
| M24x1.5 RH | AK-74 (5.45x39) |
Barrel Threads vs. Suppressor Threads
When you're setting up a suppressor, there are two different thread sizes to keep track of:
- Your barrel thread: this is the thread pitch shown in the charts above. The mount, muzzle device or direct-thread suppressor has to match it.
- The suppressor's rear thread: this is where the mount attaches to the suppressor. Many rifle suppressors use the 1.375x24 HUB pattern, while SilencerCo pistol suppressors use the 1.125x28 Alpha pattern. It does not have to match the barrel thread because the mount connects the two.
For SilencerCo rear-thread sizes and compatible mounts, see our Alpha, Bravo and Charlie mount guide.
Before You Order a Mount
- Check the thread pitch stamped on the barrel or listed in the owner's manual. These charts cover common setups, but not every barrel.
- Some aftermarket and imported barrels use M13.5x1 LH and some factory Glock G17 Gen3/Gen4 threaded barrels also use M13.5x1 LH. Verify the barrel before ordering.
- Thread pitch can vary by model and caliber on Sako, Tikka and Blaser rifles, so verify the exact rifle.
- If the barrel thread and mount do not match, use a thread adapter or a mount made for that thread pitch.
Shop pistons and mounts, threaded barrels and muzzle devices.
Thread Pitch FAQ
What is the thread pitch on a 9mm barrel?
1/2-28 RH is the most common 9mm thread pitch. M13.5x1 LH is also used on the HK USP9, Sig P226 and P320, Sig MPX, some Glock G17 Gen3/Gen4 threaded barrels, and some aftermarket and imported barrels.
What is the thread pitch on an AR-15?
5.56 / .223 AR-15 barrels are 1/2-28 RH.
What is the thread pitch on a .308?
For .308, 5/8-24 RH is the most common thread, including on AR-10s. .300 BLK and 6.5 Creedmoor also commonly use 5/8-24 RH. The M1A uses .595-32 RH, the FN FAL uses 9/16-24 LH, and the HK91 uses M15x1 RH.
What is the thread pitch on an AK?
7.62x39 AK-47 and AKM rifles use M14x1 LH. AK-74 rifles in 5.45x39 use M24x1.5 RH.
What is the thread pitch on a .45 ACP?
.578-28 RH is the most common. The HK USP45 and HK45T use M16x1 LH, and the HK Mark 23 uses M16x1 RH.
What thread pitch do .22 LR suppressors use?
.22 LR rimfire suppressors use 1/2-28 threads. If the barrel uses a different thread, you'll need an adapter.
What is the most common suppressor thread size?
On barrels, 1/2-28 is common for .22 LR, 9mm and 5.56, while 5/8-24 is common on .30 caliber rifles. Many rifle suppressors also use a 1.375x24 HUB rear thread for the mount. That rear thread is separate from the barrel thread.
What if my barrel thread doesn't match my suppressor mount?
Use a thread adapter or choose a mount made for that thread pitch.
Need Help Matching a Mount?
Call us at 512-879-1068 or send us a message. We can help you match the barrel to the right mount or adapter.