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

Component Role & External Rd Thread Profile

The DS-15 welding union male end serves as the externally threaded half of a Danish Standard (DS) hygienic pipe union. Its rear collar butt-welds directly onto stainless steel process tubing, while its outer barrel features knuckle (Rd) threads that engage the DS-13R slotted round nut to draw the mating DS-14 liner and DS-14G gasket into a sealed joint.

Material Grades, Finish & Dimensional Scope

Produced in SS304 and SS316L stainless steel with a mirror-polished surface rated at Ra < 0.8 um in the series specification schedule, the DS-15 male end covers seven nominal sizes from 1" through 4". In the dimensional schedule, bore ID spans 22.4 mm to 97.6 mm, weld-end OD spans 28.5 mm to 105 mm, external thread specifications progress from Rd44×1/6" up to Rd130×1/4", and overall height spans 20 mm to 34 mm.

Installation & Ordering Notes

Protect the external Rd thread crests and front sealing land from weld spatter during TIG or orbital butt-welding, and inspect the recessed gasket seat before assembly. Verify nominal DS tube size and stainless steel grade (SS304 or SS316L) when ordering standalone DS-15 male ends or complete DS union assemblies.