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PartsTable / COMPONENT / 2621-791-01 PIECE 121
2621-791-01 PIECE 121 ✓ Verified by PartsTable
— · HOSE FITTING
WHAT YOU NEED TO KNOW
PTFE tape on tapered threads (NPT/BSPT) JIC/AN flare connections seal metal-to-metal — no tape
NPT != BSPT — look identical, NOT interchangeable
PRODUCT OVERVIEW

The TAILPIECE,UNION is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY 715, seat_type: GASKET, overall_length: 1.875 INCHES NOMINAL IN, end_connection_type: WELDED, union_outside_diameter: 0.500 INCHES NOMINAL IN, nominal_pipe_size_designation: 0.500 INCHES IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-148-0021, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.

Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
2621-791-01 PIECE 121
NSN: 4730-01-148-0021
FSC: 4730
CAGE: 96169 — ELECTRIC BOAT CORPORATION DIV GENERAL DYNAMICS ELECTRIC BOAT (USA)
SPECIFICATIONS
materialCOPPER ALLOY 715
seat_typeGASKET
overall_length1.875 INCHES NOMINAL IN
end_connection_typeWELDED
union_outside_diameter0.500 INCHES NOMINAL IN
nominal_pipe_size_designation0.500 INCHES IN
NSN4730-01-148-0021
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 2621-791-01 PIECE 121 · OEM ⚠ VERIFY BEFORE ORDERING NPT ≠ BSPT — tapered threads look identical but are NOT interchangeable. Wrong thread = leak. JIC (37°) ≠ AN (37°) ≠ SAE 45° — flare angles must match exactly. Measure thread pitch with gauge — visual identification is unreliable ✓ BROKER TIP Always use thread sealant (PTFE tape or pipe compound) on tapered threads (NPT/BSPT). JIC/AN flare fittings seal metal-to-metal — never use tape on flare connections PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
END CONNECTION TYPE: WELDED
•
SEAT TYPE: GASKET
•
UNION OUTSIDE DIAMETER: 0.500 INCHES NOMINAL IN
•
MATERIAL: COPPER ALLOY 715
•
NOMINAL PIPE SIZE DESIGNATION: 0.500 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH1.875 INCHES NOMINAL IN
END CONNECTION TYPEWELDED
SEAT TYPEGASKET
UNION OUTSIDE DIAMETER0.500 INCHES NOMINAL IN
MATERIALCOPPER ALLOY 715
NOMINAL PIPE SIZE DESIGNATION0.500 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 9
502-4685887ITEMF52Interchangeable
interchangeable cross-reference
interchangeable
M1183/10-10N1Interchangeable
interchangeable cross-reference
interchangeable
15-00-7660Interchangeable
interchangeable cross-reference
interchangeable
502-4685887 ITEM F23Interchangeable
Same NIIN cross-reference
interchangeable
2621-791-01Interchangeable
Same NIIN cross-reference
interchangeable
87645-5421Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 2621-791-01 PIECE 121?
2621-791-01 PIECE 121 is a TAILPIECE,UNION.
What parts can replace 2621-791-01 PIECE 121?
There are 9 known substitutes for 2621-791-01 PIECE 121: 502-4685887ITEMF52, M1183/10-10N1, 15-00-7660 and 6 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 2621-791-01 PIECE 121?
2621-791-01 PIECE 121 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-148-0021. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026