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77A4 — COUPLING,CLAMP,PIPE

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

77A4: COUPLING,CLAMP,PIPE.

The COUPLING,CLAMP,PIPE is a the manufacturer industrial component. Key specifications include special_features: DIRECT REPLACEMENT PART. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-640-6512, 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
77A4
NSN: 4730-00-640-6512
NIINs: 006406512, 010874336
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 79154 — VICTAULIC COMPANY OF AMERICA INC DBA VICTAULIC COMPANY OF AMERICA (USA)
SPECIFICATIONS
special_featuresDIRECT REPLACEMENT PART
NSN4730-00-640-6512
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 77A4 · 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
•
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED: 4.500 INCHES NOMINAL IN
•
PIPE SIZE ACCOMMODATED: 4.000 INCHES NOMINAL IN
•
END TYPE FOR WHICH DESIGNED: GROOVED
•
NONDEFINITIVE SPEC/STD DATA: 3 TYPE
•
SEGMENT QUANTITY: 2
•
MATERIAL: RUBBER BUTADIENE-ACRYLONITRILE CLASS NBR GASKET
TECHNICAL CHARACTERISTICS
TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED4.500 INCHES NOMINAL IN
PIPE SIZE ACCOMMODATED4.000 INCHES NOMINAL IN
END TYPE FOR WHICH DESIGNEDGROOVED
NONDEFINITIVE SPEC/STD DATA3 TYPE
SPECIAL FEATURESW/BOLTS AND NUTS ZINC ELECTROPLATED
SEGMENT QUANTITY2
MATERIALRUBBER BUTADIENE-ACRYLONITRILE CLASS NBR GASKET
MATERIALALUMINUM ALLOY HOUSING
SUBSTITUTES & CROSS-REFERENCES 3
M10387-1-B-09Reference document
Same NSN cross-reference
Reference document — Secondary reference
MILC10387TYPE3Reference document
Same NSN cross-reference
Reference document — Identification reference
B101-4NZReference document
Same NSN cross-reference
Reference document — Secondary reference
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
Acquisition advice: Normally procured from the manufacturer (OEM)No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 77A4?
77A4 is a COUPLING,CLAMP,PIPE.
What parts can replace 77A4?
There are 3 known substitutes for 77A4: M10387-1-B-09, MILC10387TYPE3, B101-4NZ. Substitute compatibility should be verified for your specific system.
What is the NSN for 77A4?
77A4 is cataloged in the U.S. Government catalog under NSN 4730-00-640-6512. This indicates validated use in U.S. government and defense supply chains.
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✓ PartsTable — the parts reference. Every fact cited to its source.
PartsTable Design LLC · partstable.com
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.