316 Stainless Steel Pre-Welded RJT Concentric Reducer (Male Small End × Liner & Hex Nut Large End)

Directional Pre-Welded RJT Union End Construction

Designed for Ring Joint Type (RJT) hygienic union pipelines, this concentric reducer is supplied pre-welded with asymmetric union hardware along a shared centerline. The smaller-diameter port terminates in an externally threaded RJT male part, whereas the larger-diameter port terminates in an RJT weld liner fitted with a loose hexagonal union nut.

316 Stainless Steel Body and 320 Grit Finish

All nine cataloged variants (codes STCRMPWL5040 through STCRMPWL150100) are listed in 316 stainless steel with a 1.6 wall thickness and a 320 grit finish. Because RJT union nuts are frequently manufactured in 304 stainless steel even when wetted parts are 316, buyers requiring a specific alloy on the non-wetted hex nut should confirm nut material separately.

Tabulated Sizes and Dimension A Reference

The datasheet covers nine Imperial and metric combinations with dimension A (97 to 200).

• 2" × 1-1/2" (50.8 × 38.1, STCRMPWL5040): A = 97; 2-1/2" × 2" (63.5 × 50.8, STCRMPWL6550): A = 109.

• 3" × 2" and 3" × 2-1/2" (STCRMPWL7550, STCRMPWL7565): A = 121; 4" × 2", 4" × 2-1/2", and 4" × 3" (STCRMPWL10050–10075): A = 147.

• 6" × 3" and 6" × 4" (152.4 × 76.2 and 152.4 × 101.6, STCRMPWL15075, STCRMPWL150100): A = 200.

Mating Orientation and Spanner Clearance

Verify flow direction and mating union halves before ordering: the large end connects directly to a mating RJT male thread and O-ring, while the small RJT male end requires a mating RJT liner, O-ring, and hex nut. Note that dimension A is measured between the liner face datum and male end face on the drawing and does not include the overhanging skirt of the hex nut.