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A7978 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include shape: STRAIGHT, overall_length: 4.250 INCHES NOMINAL IN, shell_diameter: 2.500 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-278-8829, 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
A7978
NSN: 4730-00-278-8829
FSC: 4730
CAGE: 76894 — CELTRAC CORP (USA)
SPECIFICATIONS
shapeSTRAIGHT
overall_length4.250 INCHES NOMINAL IN
shell_diameter2.500 INCHES NOMINAL IN
NSN4730-00-278-8829
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A7978 · 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
•
NUT HEIGHT: 0.438 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 24
•
SMALLEST INSIDE DIAMETER: 0.320 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.562 INCHES NOMINAL IN
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.312 INCHES IN
•
NONDEFINITIVE SPEC/STD DATA: 16 FIGURE
•
SPECIFICATION/STANDARD DATA: 81343-J512 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
TECHNICAL CHARACTERISTICS (FLIS)
NUT HEIGHT0.438 INCHES NOMINAL IN
THREAD QUANTITY PER INCH24
SMALLEST INSIDE DIAMETER0.320 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.562 INCHES NOMINAL IN
END ITEM IDENTIFICATIONGRUMMAN A-10 AIRCRAFT
NOMINAL TUBE OUTSIDE DIAMETER0.312 INCHES IN
NONDEFINITIVE SPEC/STD DATA16 FIGURE
SPECIFICATION/STANDARD DATA81343-J512 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MATERIALCOPPER ALLOY OVERALL
NOMINAL THREAD SIZE0.500 INCHES IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 22
1305-29Interchangeable
interchangeable cross-reference
interchangeable
R100Interchangeable
interchangeable cross-reference
interchangeable
TYPE100Interchangeable
interchangeable cross-reference
interchangeable
39-337Interchangeable
interchangeable cross-reference
interchangeable
61C5Interchangeable
interchangeable cross-reference
interchangeable
SCB107257-13Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A7978?
A7978 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace A7978?
There are 22 known substitutes for A7978: 1305-29, R100, TYPE100 and 19 more. Substitute compatibility should be verified for your specific system.
Is A7978 still available?
A7978 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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Last verified: July 2026