RJT Union Seals – EPDM, FKM, PTFE & NBR
Sanitary union seals for RJT couplings, offered in EPDM, FKM, PTFE and NBR material options. The series includes stepped profiles that seat in the union joint, as well as flat-section gaskets recorded specifically for ½-inch and ¾-inch NBR sizes.
Union series | RJT |
|---|---|
Material options | EPDM, FKM, PTFE, NBR |
Profile | Stepped profile; NBR 1/2" and 3/4" flat |
Component type | Sanitary union seal / joint gasket |
EPDM drawing sizes | 1–4 in (six listed sizes) |
Size
Product overview
Replaceable seal for RJT union joints
An RJT union brings two mating fittings together using a threaded union nut, with a dedicated seal positioned between the mating faces. When the nut is tightened, compressive force retains the seal in position. The seal can be replaced during maintenance when the union joint is opened, without altering the installed pipe fittings.
Stepped profile and flat gasket distinctions
The series features stepped profiles for its standard sizes. The source specifically records that the ½-inch and ¾-inch NBR seals are flat section gaskets (source codes RJTSS12 and RJTSS20). When selecting a seal, compare the existing union seat configuration to confirm whether a stepped profile or a flat section is required.
Material options and process evaluation
Offered material options include EPDM, FKM, PTFE, and NBR. PTFE is a fluoropolymer plastic rather than an elastomer, with different compression and flexibility characteristics. Each material option must be evaluated against the intended process fluid, working temperature, and sanitation cleaning cycle, without assuming an automatic suitability or performance approval.
Dimensional references and seating inspection
The displayed dimensional drawing and table apply only to the six listed stepped EPDM sizes from 1 to 4 inches. These dimensions represent the primary EPDM source and do not establish dimensions for other materials or supplier lines. Prior to installing a replacement seal, inspect the metallic mating seat and nut threads to ensure the seating surfaces are clean and free of residue or surface damage.
Technical specifications
EPDM seal dimensions
EPDM stepped seals, six listed sizes.
Units: A/B: mm; nominal size: inches.
| Size | Metric size (mm) | A (mm) | B (mm) |
|---|---|---|---|
| 1" | 25.4 | 33.3 | 12.5 |
| 1 1/2" | 38.1 | 46 | 12.5 |
| 2" | 50.8 | 58.7 | 12.5 |
| 2 1/2" | 63.5 | 71.4 | 12.5 |
| 3" | 76.2 | 84.1 | 12.5 |
| 4" | 101.6 | 109.5 | 12.5 |
Need a different size, connection or document?
Discuss your requirementsFrequently asked questions
How do I identify the profile?
Compare the existing seal cross-section with the mating seat. The illustrated profile is EPDM stepped; flat and stepped sections must not be assumed interchangeable.
Is the nominal union size the same as dimension A?
No. Use the nominal size to select the relevant row, then check A and B against the drawing and the mating parts.
What should I provide with an enquiry?
Provide the RJT union size, seal profile and quantity, plus the medium and operating temperature. A photo or measurements of the existing seal and mating parts help resolve uncertainty.
