PartsTable
Technical Data Sheet
PartsTable / COMPONENT / 120921-1
120921-1 ✓ Verified by PartsTable
3M · 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

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This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-523-5606, 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
120921-1
NSN: 4730-01-523-5606
FSC: 4730
CAGE: 82340 — L3HARRIS TECHNOLOGIES, INC. DIV SPACE AND AIRBORNE SYSTEMS (USA)
SPECIFICATIONS
overall_length22.250 INCHES NOMINAL IN
end_item_identificationMK105 MOD 4, SEABORNE EQUIPMENT PLATFORM
NSN4730-01-523-5606
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 120921-1 · 3M ⚠ 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
TECHNICAL CHARACTERISTICS (FLIS)
OVERALL LENGTH22.250 INCHES NOMINAL IN
END ITEM IDENTIFICATIONMK105 MOD 4, SEABORNE EQUIPMENT PLATFORM
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
AMS-QQ-A-200/3Interchangeable
interchangeable cross-reference
interchangeable
LS3223Interchangeable
interchangeable cross-reference
interchangeable
BAC1503-1473Interchangeable
interchangeable cross-reference
interchangeable
AMS-QQ-A-200/2Interchangeable
interchangeable cross-reference
interchangeable
60-198Interchangeable
interchangeable cross-reference
interchangeable
710040-64Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 120921-1?
120921-1 is a EXPANSION JOINT,PIPE manufactured by 3M.
What parts can replace 120921-1?
There are 12 known substitutes for 120921-1: AMS-QQ-A-200/3, LS3223, BAC1503-1473 and 9 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 120921-1?
120921-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-523-5606. 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