SMS-15 Sanitary Welding Union Male End with Rd Thread in SS304 / SS316L

Component Role & SMS Rd-Thread Male Geometry

The SMS-15 welding union male end is the externally threaded half of a Swedish Manufacturing Standard (SMS) hygienic pipe union. Its rear collar butt-welds to metric/inch SMS stainless steel tubing, while its outer body provides external knuckle (Rd) threads and a recessed gasket groove that seats the square-section SMS union seal against an SMS-14 or SMS-14S liner.

Material Grades & Dimensional Scope

Available in SS304 and SS316L stainless steel across nominal sizes 25 mm to 102 mm (tabulated as eight rows in the dimensional schedule: 25, 32, 38, 51, 63.5, 76.1, 101.6 Max, and 101.6 Min), the SMS-15 male end features bore ID A from 22.5 mm to 97.6 mm, weld-end OD B from 25 mm to 101.6 mm, and axial height H from 19 mm to 30 mm. External threads C run from Rd40×1/6" (size 25) through Rd104×1/6" (size 76.1) to Rd132×1/6" (101.6 Max) and Rd125×1/4" (101.6 Min).

101.6 mm Thread Variants & Series schedule Note

Note that the series specification table in the series documentation prints 'Standard: DIN' in row 5 even though the page title, prose, and dimensional drawing define an SMS-15 union male end. For the 101.6 mm size, verify whether your mating nut uses Rd132×1/6" (101.6 Max, H = 30 mm) or Rd125×1/4" (101.6 Min, H = 30 mm) threads.