HUB Fixed Mount Insert - 1 3/8-24 HUB Direct-Thread Insert, 5/8x24 HUB fixed mount inserts convert a 1 3/8-24 HUB suppressor body into a direct-thread can, expanding suppressor fitment across more firearms without adding a hub. Machined from steel and finished in QPQ black nitride, the insert measures 0.765 inches long, threads to a 5/8x24 pattern, and weighs approximately 1.62 ounces, delivering a low-profile, repeatable mating surface that minimizes stack height while preserving robust engagement. Engineered for service use with Nomad, Primal, Lazarus 6, Sandman X and other HUB-compatible silencers, the insert makes it simple to move a single HUB-pattern suppressor between hosts by providing a secure direct-thread interface in common muzzle pitches. Tight tolerances and a corrosion-resistant finish reduce play and help protect suppressor threads from wear and fouling; always verify thread pitch for the host muzzle and visually confirm baffle alignment after installation before firing.