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Technical Data Sheet
PartsTable / COMPONENT / 157-6D
157-6D ✓ 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 COUPLING ASSEMBLY,SELF-SEALING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY BODY, seat_angle: 37.0 DEGREES, thread_class: 3A SECOND QUICK DISCONNECT END A, overall_length: 3.906 INCHES NOMINAL IN, connection_type: THREADED EXTERNAL TUBE FIRST QUICK DISCONNECT END, connection_style: FLARED FIRST QUICK DISCONNECT END. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-7499, 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
157-6D
NSN: 4730-00-203-7499
FSC: 4730
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY BODY
seat_angle37.0 DEGREES
thread_class3A SECOND QUICK DISCONNECT END A
overall_length3.906 INCHES NOMINAL IN
connection_typeTHREADED EXTERNAL TUBE FIRST QUICK DISCONNECT END
connection_styleFLARED FIRST QUICK DISCONNECT END
first_leg_length1.094 INCHES NOMINAL IN
style_designatorCOUPLING ASSEMBLY
features_providedSELF-SEALING
second_leg_length0.556 INCHES NOMINAL IN
surface_treatmentANODIZE BODY
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NSN4730-00-203-7499
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 157-6D · 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
•
STYLE DESIGNATOR: COUPLING ASSEMBLY
•
SECOND END RELATIONSHIP WITH FIRST END: NOT IDENTICAL
•
MATERIAL: ALUMINUM ALLOY BODY
•
NOMINAL THREAD SIZE: 0.562 INCHES FIRST QUICK DISCONNECT END IN
•
SURFACE TREATMENT: ANODIZE BODY
TECHNICAL CHARACTERISTICS (FLIS)
STYLE DESIGNATORCOUPLING ASSEMBLY
SECOND END RELATIONSHIP WITH FIRST ENDNOT IDENTICAL
MATERIALALUMINUM ALLOY BODY
NOMINAL THREAD SIZE0.562 INCHES FIRST QUICK DISCONNECT END IN
SURFACE TREATMENTANODIZE BODY
STYLE DESIGNATORCOUPLING ASSEMBLY
NOMINAL THREAD SIZE0.562 INCHES SECOND QUICK DISCONNECT END IN
NOMINAL THREAD SIZE0.562 INCHES SECOND QUICK DISCONNECT END IN
OVERALL LENGTH3.906 INCHES NOMINAL IN
THREAD CLASS3A SECOND QUICK DISCONNECT END A
VERIFIED SUBSTITUTES & CROSS-REFERENCES 16
AN6220-8Interchangeable
interchangeable cross-reference
interchangeable
MIL-C-5502Interchangeable
interchangeable cross-reference
interchangeable
140S2-8DInterchangeable
interchangeable cross-reference
interchangeable
AN6221-8Interchangeable
interchangeable cross-reference
interchangeable
140-S1-8DInterchangeable
interchangeable cross-reference
interchangeable
1576Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 157-6D?
157-6D is a COUPLING ASSEMBLY,SELF-SEALING.
What parts can replace 157-6D?
There are 16 known substitutes for 157-6D: AN6220-8, MIL-C-5502, 140S2-8D and 13 more. Substitute compatibility should be verified for your specific system.
Is 157-6D still available?
157-6D 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