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8537687 — LOCKNUT,TUBE FITTING

✓ Government record, cited
— · HOSE FITTING
PRODUCT OVERVIEW

8537687: LOCKNUT,TUBE FITTING.

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 2024 OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.250 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), thread_direction: RIGHT-HAND. This part is cataloged in the U.S.

Government catalog under NSN 4730-00-277-5083, 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
8537687
NSN: 4730-00-277-5083
FSC: 4730 — Hose, Pipe, Tube, Lubrication, and Railing Fittings
CAGE: 18876 — US ARMY AVIATION AND MISSILE COMMAND (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2024 OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.250 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
thread_directionRIGHT-HAND
surface_treatmentANODIZE OVERALL
fabrication_methodMACHINED
width_across_flats0.809 INCHES MINIMUM AND 0.816 INCHES MAXIMUM IN
nominal_thread_size0.562 INCHES IN
packing_recess_depth0.037 INCHES MINIMUM AND 0.047 INCHES MAXIMUM IN
packing_recess_diameter0.728 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN
NSN4730-00-277-5083
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 8537687 · 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
•
WIDTH ACROSS FLATS: 0.809 INCHES MINIMUM AND 0.816 INCHES MAXIMUM IN
•
PACKING RECESS DIAMETER: 0.728 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
THREAD SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
THREAD DIRECTION: RIGHT-HAND
•
NOMINAL THREAD SIZE: 0.562 INCHES IN
•
SPECIFICATION/STANDARD DATA: 88044-AN6289 GOVERNMENT STANDARD
TECHNICAL CHARACTERISTICS
WIDTH ACROSS FLATS0.809 INCHES MINIMUM AND 0.816 INCHES MAXIMUM IN
PACKING RECESS DIAMETER0.728 INCHES MINIMUM AND 0.738 INCHES MAXIMUM IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
THREAD DIRECTIONRIGHT-HAND
NOMINAL THREAD SIZE0.562 INCHES IN
SPECIFICATION/STANDARD DATA88044-AN6289 GOVERNMENT STANDARD
NUT HEIGHT0.250 INCHES MINIMUM AND 0.282 INCHES MAXIMUM IN
SURFACE TREATMENTANODIZE OVERALL
SUBSTITUTES & CROSS-REFERENCES 5
AS5179Reference document
Same NSN cross-reference
Reference document — Secondary reference
AS5179D06Reference document
Same NSN cross-reference
Reference document — Secondary reference
BACN10DU6DReference document
Same NSN cross-reference
Reference document — Secondary reference
AS4841Reference document
Same NSN cross-reference
Reference document — Secondary reference
4730PL0816795Reference document
Same NSN cross-reference
Reference document — Informative reference only
LIFECYCLE
NSN statusCancelled· U.S. Government catalog
No demilitarization required
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FREQUENTLY ASKED QUESTIONS
What is 8537687?
8537687 is a LOCKNUT,TUBE FITTING.
What parts can replace 8537687?
There are 5 known substitutes for 8537687: AS5179, AS5179D06, BACN10DU6D and 2 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 8537687?
8537687 is cataloged in the U.S. Government catalog under NSN 4730-00-277-5083. 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.