RJT Sanitary Union EPDM O-Ring Seal

A circular-section EPDM O-ring seal designed for the recessed groove of RJT (Ring Joint Type) sanitary pipe unions. Listed across eight nominal sizes from 1" (25.4 mm) to 6" (152.4 mm) with a uniform 6.6 mm cross-section on dimensioned sizes.

Mating Interface	RJT (Ring Joint Type) sanitary union O-ring groove
Seal Profile	Circular cross-section O-ring (OD A, cord diameter B)
Material	EPDM
Size Range	8 nominal sizes from 1" (25.4 mm) to 6" (152.4 mm): 1", 1 1/2", 2", 2 1/2", 3", 4", 5", 6"
Ring geometry	Circular cross-section toroidal O-ring

Size

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Circular O-Ring Profile for RJT Unions

The RJT union seal uses a true circular O-ring cross-section (Ring Joint Type) that seats inside the toroidal groove of an RJT union male part and compresses against the conical or radiused seat of the matingRJT liner. Distinguish this circular O-ring from flat or stepped BSM union seals before replacement.

EPDM Material and Temperature Scope

The primary series specifications and datasheet specify black EPDM across all listed sizes and note a maximum temperature rating of 120 °C in the supplier text. Confirm compound suitability and batch documentation against your specific process fluid, cleaning chemistry, and operating temperature.

1" to 6" (25.4–152.4 mm) Dimensional Table

Eight nominal tube sizes are listed: 1" (25.4 mm, OD A = 33.3 mm), 1 1/2" (38.1 mm, A = 46 mm), 2" (50.8 mm, A = 58.7 mm), 2 1/2" (63.5 mm, A = 71.4 mm), 3" (76.2 mm, A = 84.1 mm), 4" (101.6 mm, A = 109.5 mm), 5" (127 mm), and 6" (152.4 mm, A = 161.2 mm). Every dimensioned row shares a 6.6 mm cord thickness B.

5" Size Checks and Groove Matching

In both the specification sheet and the dimensional drawing, the 5" (127 mm) option is listed without values for outside diameter A or cord thickness B. If ordering the 5" size, verify the exact O-ring diameter and cord section against your mating RJT union groove rather than interpolating from adjacent rows.