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J-978 ✓ 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

CABLE ASSEMBLY,SPECIAL PURPOSE,E. Key specifications include material: ALUMINUM, mouth_width: 1.627 INCHES MINIMUM AND 1.747 INCHES MAXIMUM IN, mouth_length: 2.127 INCHES MINIMUM AND 2.247 INCHES MAXIMUM IN, overall_width: 2.127 INCHES MINIMUM AND 2.247 INCHES MAXIMUM IN, overall_height: 1.627 INCHES MINIMUM AND 1.747 INCHES MAXIMUM IN, overall_length: 3.377 INCHES MINIMUM AND 3.497 INCHES MAXIMUM IN. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-288-0869, 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
J-978
NSN: 4730-01-288-0869
FSC: 4730
CAGE: 53059 — SPIRAX SARCO INC DBA SPIRAX SARCO (USA)
SPECIFICATIONS
materialALUMINUM
mouth_width1.627 INCHES MINIMUM AND 1.747 INCHES MAXIMUM IN
mouth_length2.127 INCHES MINIMUM AND 2.247 INCHES MAXIMUM IN
overall_width2.127 INCHES MINIMUM AND 2.247 INCHES MAXIMUM IN
overall_height1.627 INCHES MINIMUM AND 1.747 INCHES MAXIMUM IN
overall_length3.377 INCHES MINIMUM AND 3.497 INCHES MAXIMUM IN
connection_methodWAVEGUIDE FLANGE
surface_treatmentANODIZED INSIDE
fsc_application_dataRADAR EQUIPMENT
frequency_range_rating+12.4 TO 18.0 GIGAHERTZ
accommodated_conductor_typeWAVEGUIDE
NSN4730-01-288-0869
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: J-978 · 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
TYPICAL APPLICATIONS
  • Server Internal Cabling
  • Data Center Cable Infrastructure
  • SAS/SATA Drive Connectivity
VERIFIED SUBSTITUTES & CROSS-REFERENCES 23
62-639Interchangeable
interchangeable cross-reference
interchangeable
DR657769Interchangeable
interchangeable cross-reference
interchangeable
385AInterchangeable
interchangeable cross-reference
interchangeable
J-978 UNIT 62414Interchangeable
interchangeable cross-reference
interchangeable
62414Interchangeable
interchangeable cross-reference
interchangeable
J-978Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is J-978?
J-978 is a CABLE ASSEMBLY,SPECIAL PURPOSE,E.
What parts can replace J-978?
There are 23 known substitutes for J-978: 62-639, DR657769, 385A and 20 more. Substitute compatibility should be verified for your specific system.
What is the NSN for J-978?
J-978 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-288-0869. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026