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AN818-4W ✓ 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 ADAPTER,STRAIGHT,TUBE TO BOSS is a the manufacturer industrial component. Key specifications include material: ALUMINUM ALLOY 7075 OVERALL, nut_style: TUBE COUPLING, nut_height: 0.620 INCHES NOMINAL IN, thread_class: 3B, thread_series: UNIFIED NATIONAL JOINT FINE (UNJF), 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 4730-01-290-4913, 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
AN818-4W
NSN: 4730-01-290-4913
FSC: 4730
CAGE: 88044 — AERONAUTICAL STANDARDS GROUP DEPT OF NAVY AND AIR FORCE (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 7075 OVERALL
nut_styleTUBE COUPLING
nut_height0.620 INCHES NOMINAL IN
thread_class3B
thread_seriesUNIFIED NATIONAL JOINT FINE (UNJF)
thread_directionRIGHT-HAND
fabrication_methodMACHINED
length_to_shoulder0.532 INCHES NOMINAL IN
width_across_flats0.563 INCHES NOMINAL IN
nominal_thread_size0.437 INCHES IN
end_item_identificationA4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
smallest_inside_diameter0.305 INCHES NOMINAL IN
NSN4730-01-290-4913
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: AN818-4W · 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 SERIES: UNIFIED NATIONAL JOINT FINE (UNJF)
•
NOMINAL TUBE OUTSIDE DIAMETER: 0.250 INCHES IN
•
LENGTH TO SHOULDER: 0.532 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.437 INCHES IN
•
SMALLEST INSIDE DIAMETER: 0.305 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 20
•
WIDTH ACROSS FLATS: 0.563 INCHES NOMINAL IN
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNIFIED NATIONAL JOINT FINE (UNJF)
NOMINAL TUBE OUTSIDE DIAMETER0.250 INCHES IN
LENGTH TO SHOULDER0.532 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.437 INCHES IN
SMALLEST INSIDE DIAMETER0.305 INCHES NOMINAL IN
END ITEM IDENTIFICATIONA4 BRADLEY FIGHTING VEHICLE; A3 BRADLEY FIGHTING VEHICLE
THREAD QUANTITY PER INCH20
WIDTH ACROSS FLATS0.563 INCHES NOMINAL IN
SPECIFICATION/STANDARD DATA88044-AN818-4W GOVERNMENT STANDARD W
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
3110242Interchangeable
interchangeable cross-reference
interchangeable
AN818-4DInterchangeable
interchangeable cross-reference
interchangeable
C8175450Interchangeable
interchangeable cross-reference
interchangeable
AN818Interchangeable
Same NIIN cross-reference
interchangeable
AS4841Interchangeable
Same NIIN cross-reference
interchangeable
4730PL1460054Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is AN818-4W?
AN818-4W is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace AN818-4W?
There are 8 known substitutes for AN818-4W: 3110242, AN818-4D, C8175450 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for AN818-4W?
AN818-4W is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-01-290-4913. 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