PartsTable
Technical Data Sheet
A21657-1 ✓ 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 ADAPTER,STRAIGHT,PIPE TO BOSS is a the manufacturer industrial component. Key specifications include material: COPPER ALLOY OVERALL, thread_class: 3A SECOND END A, connection_type: THREADED INTERNAL PIPE FIRST END, connection_style: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END, surface_treatment: CADMIUM OVERALL, nominal_thread_size: 0.375 INCHES FIRST END 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 4730-01-036-9487, 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
A21657-1
NSN: 4730-01-036-9487
FSC: 4730
CAGE: 08441 — SPX CORPORATION DBA DIELECTRIC COMMUNICATIONS DIV SPX COMMUNICATION TECHNOLOGIES (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
thread_class3A SECOND END A
connection_typeTHREADED INTERNAL PIPE FIRST END
connection_styleEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
surface_treatmentCADMIUM OVERALL
nominal_thread_size0.375 INCHES FIRST END IN
nominal_overall_length0.910 INCHES IN
thread_quantity_per_inch26 SECOND END
thread_series_designatorNPT FIRST END
NSN4730-01-036-9487
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A21657-1 · 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
NOMINAL THREAD SIZE: 0.937 INCHES SECOND END IN
CONNECTION TYPE: THREADED INTERNAL PIPE FIRST END
THREAD QUANTITY PER INCH: 26 SECOND END
SURFACE TREATMENT: CADMIUM OVERALL
NOMINAL OVERALL LENGTH: 0.910 INCHES IN
CONNECTION STYLE: EXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL THREAD SIZE0.937 INCHES SECOND END IN
CONNECTION TYPETHREADED INTERNAL PIPE FIRST END
THREAD QUANTITY PER INCH26 SECOND END
SURFACE TREATMENTCADMIUM OVERALL
CONNECTION TYPETHREADED EXTERNAL BOSS SECOND END
NOMINAL OVERALL LENGTH0.910 INCHES IN
CONNECTION STYLEEXTERNAL SEAT FOR GASKET SEAL (BOSS) SECOND END
NOMINAL THREAD SIZE0.375 INCHES FIRST END IN
CONNECTION STYLEPLAIN (PIPE) FIRST END
MATERIALCOPPER ALLOY OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 7
7523587P2Interchangeable
interchangeable cross-reference
interchangeable
21657Interchangeable
interchangeable cross-reference
interchangeable
221474Interchangeable
interchangeable cross-reference
interchangeable
536486Interchangeable
interchangeable cross-reference
interchangeable
4303-0020015Interchangeable
interchangeable cross-reference
interchangeable
4300Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A21657-1?
A21657-1 is a ADAPTER,STRAIGHT,PIPE TO BOSS.
What parts can replace A21657-1?
There are 7 known substitutes for A21657-1: 7523587P2, 21657, 221474 and 4 more. Substitute compatibility should be verified for your specific system.
What is the NSN for A21657-1?
A21657-1 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-036-9487. This indicates validated use in U.S. government and defense supply chains.
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