What’s the Difference Between UNF and UNEF on Airgun Silencers – If you’ve ever shopped for an airgun silencer or moderator, you’ll have noticed thread types like ½” UNF and ½” UNEF listed in the product descriptions. For new shooters, this can be confusing – both look similar, yet they are not interchangeable. In this guide, we’ll explain the difference between UNF and UNEF threads, why it matters, and how to make sure you buy the right moderator for your rifle.
Understanding Thread Types
When attaching a silencer to an airgun, the connection is made via the barrel thread. This is usually measured in inches, with the most common size being ½ inch. But it’s not just about diameter – the thread pitch (the number of threads per inch) must also match.
UNF (Unified National Fine)
- The most common thread standard used on airguns.
- ½” UNF = ½ inch diameter with 20 threads per inch (20 TPI).
- Found on a wide variety of PCP and spring air rifles in the UK and Europe.
- Almost every aftermarket silencer or moderator is available in this size.
UNEF (Unified National Extra Fine)
- Similar in diameter but with a finer pitch.
- ½” UNEF = ½ inch diameter with 28 threads per inch (28 TPI).
- Less common in airguns, more often seen in the US or on specific rifle barrels.
- Requires a matching moderator or a thread adapter.
Why the Difference Matters
Although both are ½” in diameter, the pitch of the thread is different. A UNF moderator will not screw properly onto a UNEF barrel and vice versa. Forcing the wrong fit risks damaging both the barrel thread and the silencer.
That’s why it’s important to always check your rifle’s specification before ordering a new moderator. Manufacturers will normally state whether the barrel is threaded ½” UNF or ½” UNEF.
Common Uses on Airguns
½” UNF (20 TPI)
- Standard on most UK and European air rifles.
- Compatible with the widest range of moderators.
½” UNEF (28 TPI)
- Less common but found on some American-market air rifles.
- Sometimes used on specialist barrels where a finer thread is preferred.
Can You Use an Adapter?
Yes – if your airgun has a UNEF thread but you’d like to use a UNF moderator (or vice versa), a simple thread adapter can solve the issue. These adapters are inexpensive and prevent cross-threading or damage.
Conclusion
When it comes to airgun silencers, thread compatibility is everything. The difference between UNF (20 TPI) and UNEF (28 TPI) may sound minor, but it’s enough to stop a silencer from fitting properly.
If you’re unsure, always check your rifle’s manual or contact your retailer before purchasing. And remember – using the correct thread ensures a secure fit, protects your barrel, and gives you the best sound suppression performance.
About This Blog
Shop Address: Just Air Guns, Trimex House, Pier Road, Feltham, TW14 0TW
Website: www.Justairguns.co.uk
Email: [email protected]
Phone: 0330 999 5224
Blog Title: What’s the Difference Between UNF and UNEF on Suppressors
Blog Author: Mark Watts