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Technical Data Sheet
PartsTable / COMPONENT / 61-657-1/2
61-657-1/2 ✓ 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 61-657-1/2 is a the manufacturer industrial component. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-073-8113, 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
61-657-1/2
NSN: 4730-01-073-8113
FSC: 4730
CAGE: 3Z031 — LEE BRASS CO (USA)
SPECIFICATIONS
Part Number61-657-1/2
NSN4730-01-073-8113
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 61-657-1/2 · 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
•
SEAT TYPE: GROUND-JOINT
•
CONNECTION TYPE: THREADED INTERNAL PIPE ALL ENDS
•
CONNECTION STYLE: PLAIN (PIPE) ALL ENDS
•
THREAD SERIES DESIGNATOR: NPT FIRST END
•
UNION JOINT LOCATION: FIRST END
•
MATERIAL: COPPER ALLOY OVERALL
•
NOMINAL OVERALL LENGTH: 1.812 INCHES IN
•
NOMINAL THREAD SIZE: 0.500 INCHES ALL ENDS IN
TECHNICAL CHARACTERISTICS (FLIS)
SEAT TYPEGROUND-JOINT
CONNECTION TYPETHREADED INTERNAL PIPE ALL ENDS
CONNECTION STYLEPLAIN (PIPE) ALL ENDS
THREAD SERIES DESIGNATORNPT FIRST END
UNION JOINT LOCATIONFIRST END
MATERIALCOPPER ALLOY OVERALL
NOMINAL OVERALL LENGTH1.812 INCHES IN
NOMINAL THREAD SIZE0.500 INCHES ALL ENDS IN
STYLE DESIGNATORTHREADED
OPERATING PRESSURE125.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
AA59617-37Interchangeable
interchangeable cross-reference
interchangeable
402Interchangeable
interchangeable cross-reference
interchangeable
196284Interchangeable
interchangeable cross-reference
interchangeable
775177-012Interchangeable
interchangeable cross-reference
interchangeable
WW-U-516-57Interchangeable
interchangeable cross-reference
interchangeable
A-A-59617Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 61-657-1/2?
61-657-1/2 is a 61-657-1/2.
What parts can replace 61-657-1/2?
There are 29 known substitutes for 61-657-1/2: AA59617-37, 402, 196284 and 26 more. Substitute compatibility should be verified for your specific system.
Is 61-657-1/2 still available?
61-657-1/2 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026