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AN6289S4 ✓ 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

The LOCKNUT,TUBE FITTING is a the manufacturer industrial component. Key specifications include material: STEEL COMP 347 OVERALL, nut_style: TUBE FITTING LOCKNUT, nut_height: 0.281 INCHES NOMINAL IN, thread_class: 2B, thread_series: UNF, thread_direction: RIGHT-HAND. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-3140, 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
AN6289S4
NSN: 4730-00-203-3140
FSC: 4730
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialSTEEL COMP 347 OVERALL
nut_styleTUBE FITTING LOCKNUT
nut_height0.281 INCHES NOMINAL IN
thread_class2B
thread_seriesUNF
thread_directionRIGHT-HAND
surface_treatmentPASSIVATE OVERALL
width_across_flats0.688 INCHES NOMINAL IN
nominal_thread_size0.438 INCHES IN
packing_recess_depth0.042 INCHES NOMINAL IN
packing_recess_diameter0.608 INCHES NOMINAL IN
thread_quantity_per_inch20
NSN4730-00-203-3140
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN6289S4 · 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
•
THREAD DIRECTION: RIGHT-HAND
•
SPECIFICATION/STANDARD DATA: 88044-AN6289 GOVERNMENT STANDARD
•
MATERIAL: STEEL COMP 347 OVERALL
•
PACKING RECESS DEPTH: 0.042 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 20
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
THREAD CLASS: 2B
•
NOMINAL THREAD SIZE: 0.438 INCHES IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD DIRECTIONRIGHT-HAND
SPECIFICATION/STANDARD DATA88044-AN6289 GOVERNMENT STANDARD
MATERIALSTEEL COMP 347 OVERALL
PACKING RECESS DEPTH0.042 INCHES NOMINAL IN
THREAD QUANTITY PER INCH20
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
THREAD CLASS2B
NOMINAL THREAD SIZE0.438 INCHES IN
PACKING RECESS DIAMETER0.608 INCHES NOMINAL IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONQQ-P-35,TYPE 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
VERIFIED SUBSTITUTES & CROSS-REFERENCES 3
AS5179Interchangeable
Same NIIN cross-reference
interchangeable
SAE-AS4841Interchangeable
Same NIIN cross-reference
interchangeable
AS5179R04Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN6289S4?
AN6289S4 is a LOCKNUT,TUBE FITTING.
What parts can replace AN6289S4?
There are 3 known substitutes for AN6289S4: AS5179, SAE-AS4841, AS5179R04. Substitute compatibility should be verified for your specific system.
What is the NSN for AN6289S4?
AN6289S4 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-203-3140. 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