BSM Butt-Weld Sanitary Union Liner

Stepped Retaining Shoulder and Butt-Weld Neck Geometry

This BSM weld liner is the female-retained ferrule component of a BSM/RJT sanitary tube union. One end is machined as a plain butt-weld neck sized to imperial stainless steel tubing (bore A, tube OD B), while the mating end forms a stepped collar (intermediate step OD C, outer flange OD D) captured by the rear lip of a BSM hex or slotted union nut.

Material Options and Comparative Datasheet

The primary catalog page lists SS304 or SS316L stainless steel across a 1" to 4" nominal size range (note that Quick Details carries a stray 'Model: IDF-14' label and Type 'Clamp, Weld, Thread'). A retained datasheet (BSMWL25–BSMWL100 in Grade 316, 1"–4", length 19.5 mm) is preserved as a comparative reference.

Tabulated Dimensions on Drawing BSM RJT LINER (A, B, C, D, E)

Across the seven rows on the primary drawing (mm), bore A, tube OD B, step diameter C, flange OD D, and axial height E are: 25.4 (A=22.2, B=25.4, C=32.6, D=41.3, E=19), 38.1 (A=34.9, B=38.1, C=45.3, D=54, E=19), 50.8 (A=47.6, B=50.8, C=58, D=66.7, E=19), 63.5 (A=60.3, B=63.5, C=70.7, D=79.4, E=19), 76.2 (A=73, B=76.2, C=83.4, D=92.1, E=19), 101.6 (A=97.6, B=101.6, C=108.8, D=117.5, E=19), and 152.4 (A=149.2, B=152.4, C=159.6, D=168.3, E=27).

Selection and Mating Face Checks Notes

Notice that wall thickness (B−A)/2 is 1.6 mm on 25.4–76.2 mm and 152.4 mm, and 2.0 mm on 101.6 mm. Confirm whether your union requires the tapered RJT-style nose shown in the drawing cross-section or a flat-faced CIP liner before ordering.