NOTE: The muzzle thread and socket drawings below are posted in accordance with SAAMI’s mission to promote safety, interchangeability, reliability and quality and are available to the public, without restriction. These drawings are not an approved American National Standard (ANS) at present. Any questions about the drawings should be directed to SAAMI staff.
THREAD APPLICATION GUIDE
(Links to Thread & Socket Drawings in the Table)
| Application | Indexing Surface | Caliber Usage (XX.XX = mm) | Thread & Socket Drawings |
| Rimfire | Muzzle / Shoulder | ≤.220 (≤5.59) |
½-28 – Thread & Socket |
| Centerfire Pistol & Revolver | Muzzle / Shoulder | ≤.355 (≤9.02) |
½-28 – Thread & Socket |
| Centerfire Pistol & Revolver | Muzzle | >.355 / ≤.395 (>9.02 / ≤10.03) |
9/16-24 – Thread & Socket |
| Centerfire Rifle | Muzzle / Shoulder | ≤.225 (≤5.72) |
½-28 – Thread & Socket |
| Centerfire Rifle | Muzzle / Shoulder | >.225 / ≤.305 (>5.72 / ≤7.75) |
⅝-24 – Thread & Socket |
| Centerfire Rifle | Muzzle / Shoulder | >.305 / ≤.450 (>7.75 / ≤11.43) |
11/16-24 – Thread & Socket |
| Centerfire Rifle | Shoulder | >.305 / ≤.450 (>7.75 / ≤11.43) |
M18 X 1.5 RH – Thread & Socket |
| Centerfire Rifle | Muzzle / Shoulder | >.305 / ≤.450 (>7.75 / ≤11.43) |
¾-24 – Thread & Socket |