SMS 15A Threaded Male Butt-Weld Union Ferrule

SMS 15A Externally Threaded Male Ferrule Construction

The SMS 15A Threaded Male Ferrule is the externally threaded male half of a Swedish-standard SMS sanitary pipe union. Machined from 304L stainless steel, it combines an external round thread barrel, a recessed front groove that captures an SMS union gasket, and a cylindrical butt-weld neck for sanitary tube welding.

Distinction from DIN 15A Male and SMS 14A Liner Ferrules

In an SMS union joint, the 15A male ferrule pairs with a stepped SMS 14A liner, an SMS square-section gasket, and a slotted round nut. Although DIN male ferrules also use the '15A' series label in the catalog, the SMS 15A series has different thread diameters (C = 1.57 inch to 5.20 inch, versus 2.05 inch to 5.12 inch on DIN 15A) and shorter lengths (A = 0.75 inch to 1.38 inch).

Published 1" to 4" SMS Dimensional Table

Across the six cataloged sizes—1 inch (25 mm), 1-1/2 inch (38 mm), 2 inch (51 mm), 2-1/2 inch (63.5 mm), 3 inch (76.1 mm), and 4 inch (101.6 mm)—overall length A spans 0.75 inch to 1.38 inch, dimension B spans 1.00 inch to 4.00 inch, and thread OD C spans 1.57 inch to 5.20 inch.

Thread Callout and Tube Wall Checks

Because the drawing lists thread OD C in inches without printing the metric Rd thread pitch or weld-end wall thickness, verify mating SMS nut compatibility and tube wall schedule before welding.