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157-12D — COUPLING ASSEMBLY,QUICK DISCONNE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

157-12D: COUPLING ASSEMBLY,QUICK DISCONNE.

COUPLING ASSEMBLY,QUICK DISCONNE. Key specifications include material: ALUMINUM OR ALUMINUM ALLOY OVERALL, leg_length: 0.880 INCHES NOMINAL IN, seat_angle: 45.0 DEGREES, thread_class: 3A FIRST FLUID END CONNECTION A, overall_length: 5.141 INCHES MINIMUM AND 5.760 INCHES MAXIMUM IN, connection_type: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-931-1983, 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
157-12D
NSN: 4730-00-931-1983
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialALUMINUM OR ALUMINUM ALLOY OVERALL
leg_length0.880 INCHES NOMINAL IN
seat_angle45.0 DEGREES
thread_class3A FIRST FLUID END CONNECTION A
overall_length5.141 INCHES MINIMUM AND 5.760 INCHES MAXIMUM IN
connection_typeTHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
connection_styleFLARED FIRST FLUID END CONNECTION
special_featuresBULKHEAD THREADS ON 1ST FLUID END CONNECTION
style_designatorCOUPLING ASSEMBLY
features_providedSELF-SEALING
surface_treatmentANODIZE OVERALL
operating_pressure3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
NSN4730-00-931-1983
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 157-12D · 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
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
CONNECTION STYLE: FLARED FIRST FLUID END CONNECTION
•
CONNECTION TYPE: THREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
•
STYLE DESIGNATOR: COUPLING ASSEMBLY
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.750 INCHES FIRST FLUID END CONNECTION IN
•
OPERATING PRESSURE: 3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
•
LEG LENGTH: 0.880 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
CONNECTION STYLEFLARED FIRST FLUID END CONNECTION
CONNECTION TYPETHREADED EXTERNAL TUBE FIRST FLUID END CONNECTION
STYLE DESIGNATORCOUPLING ASSEMBLY
OVERALL LENGTH5.141 INCHES MINIMUM AND 5.760 INCHES MAXIMUM IN
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.750 INCHES FIRST FLUID END CONNECTION IN
OPERATING PRESSURE3000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
LEG LENGTH0.880 INCHES NOMINAL IN
FEATURES PROVIDEDSELF-SEALING
NOMINAL THREAD SIZE1.062 INCHES FIRST FLUID END CONNECTION IN
OTHER ITEMS IN FSC 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4730-00-000-1895 4730-00-000-4289 4730-00-000-4445 4730-00-000-8373 4730-00-000-8897 4730-00-001-0007 4730-00-001-0008
SUBSTITUTES & CROSS-REFERENCES 1
15Z-12DReference document
Same NSN cross-reference
Reference document — Advisory reference — outside the item-of-supply concept
LIFECYCLE
NSN statusActive· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 157-12D?
157-12D is a COUPLING ASSEMBLY,QUICK DISCONNE.
What parts can replace 157-12D?
There is 1 known substitute for 157-12D: 15Z-12D. Substitute compatibility should be verified for your specific system.
What is the NSN for 157-12D?
157-12D is cataloged in the U.S. Government catalog under NSN 4730-00-931-1983. This indicates validated use in U.S. government and defense supply chains.
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U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
PartsTable commercial catalog: edition Unified commercial catalog snapshot through 2026-09-28, edition date not on file, retrieved 2026-09-28.