Do You Know What Thread Pitch Matches Your HK Barrel?

When upgrading or modifying your HK (Heckler & Koch) firearm with a suppressor, compensator, or muzzle brake, the most important detail is the barrel thread pitch. The wrong threads can cause unsafe alignment, damage, or failure. This page lists factory thread pitches for popular HK models, plus common US-threaded alternatives and adapter tips.

What Is Barrel Thread Pitch?

Thread pitch is the size, spacing, and direction of the threads cut into a barrel. Matching the correct pitch ensures a secure fit for suppressors and muzzle devices.

• Metric threads (example: 13.5x1 LH) are common on European-made HK factory barrels.
• US threads (example: 1/2x28 RH) are the most common threading standard for American suppressors and muzzle devices.
• Right-hand (RH) threads tighten clockwise; Left-hand (LH) tighten counter-clockwise.

Click any thread pitch in the tables to view matching product pages for barrels or compatible parts.

H&K Pistols – VP9 / VP40 Series

H&K Pistols – P30 Series

H&K Pistols – P2000 Series

H&K Pistols – USP / HK45 / MK23 Series

H&K SMG - MP5 / SP5 Series

H&K SMG - UMP

H&K Rifles - G3 / HK91 Series

H&K Rifles – HK417 / MR762

H&K Rifles – HK416 / MR556

H&K Rifles - HK33 / HK93 / HK53 Series

H&K Rifles – G36

B&T – Pistols / SMG / Rifles

Notes: Many B&T SMG/PDW platforms use tri-lug profiles (9mm, .45, 10mm). Where threads are listed (e.g., APC9K 1/2x28 RH), standard US muzzle devices and suppressors can be used without a tri-lug adapter. Always confirm your exact variant.

FAQ

Why do many HK pistols use 13.5x1 LH threads?

HK follows European and military standards. Left-hand metric threads help reduce the chance of a muzzle device loosening during recoil.

Can I run a US 1/2x28 RH suppressor on my factory HK 13.5x1 LH barrel?

Yes, with a properly machined thread adapter to convert 13.5x1 LH to 1/2x28 RH. Alternatively, use a US-threaded aftermarket barrel.

Is mismatching thread pitch dangerous?

Yes. Forcing incompatible threads can damage the barrel or device and risks baffle strikes and unsafe operation.

What are the most common US thread pitches?

1/2x28 RH for most 9mm/.22, .578x28 RH for .45 ACP, and 5/8x24 RH for many .30-cal rifles.

How can I verify my barrel’s thread pitch?

Consult manufacturer specifications, measure with the correct gauges, or have a qualified gunsmith verify before installing any muzzle device.

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