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Technical Data Sheet
PartsTable / COMPONENT / 290-20D
290-20D ✓ 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 2014 OVERALL, nut_style: TUBE COUPLING, nut_height: 1.219 INCHES NOMINAL IN, thread_class: 3B, thread_series: UN, special_features: GRUMMAN A-10 AIRCRAFT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-287-0271, 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
290-20D
NSN: 4730-00-287-0271
FSC: 4730
CAGE: 00624 — EATON AEROQUIP LLC DBA JACKSON NORTH 1 DIV FLUID AND ELECTRICAL DISTRIBUTION (USA)
SPECIFICATIONS
materialALUMINUM ALLOY 2014 OVERALL
nut_styleTUBE COUPLING
nut_height1.219 INCHES NOMINAL IN
thread_class3B
thread_seriesUN
special_featuresGRUMMAN A-10 AIRCRAFT
thread_directionRIGHT-HAND
surface_treatmentANODIZE OVERALL
fabrication_methodMACHINED
length_to_shoulder1.017 INCHES NOMINAL IN
width_across_flats1.984 INCHES MINIMUM AND 2.016 INCHES MAXIMUM IN
nominal_thread_size1.625 INCHES IN
NSN4730-00-287-0271
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 290-20D · 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: 1.984 INCHES MINIMUM AND 2.016 INCHES MAXIMUM IN
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-A-225/4,TP T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
•
NOMINAL TUBE OUTSIDE DIAMETER: 1.250 INCHES IN
•
NUT HEIGHT: 1.219 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 1.625 INCHES IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: MIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
•
NUT STYLE: TUBE COUPLING
TECHNICAL CHARACTERISTICS (FLIS)
WIDTH ACROSS FLATS1.984 INCHES MINIMUM AND 2.016 INCHES MAXIMUM IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-A-225/4,TP T6 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NOMINAL TUBE OUTSIDE DIAMETER1.250 INCHES IN
NUT HEIGHT1.219 INCHES NOMINAL IN
SPECIAL FEATURESGRUMMAN A-10 AIRCRAFT
NOMINAL THREAD SIZE1.625 INCHES IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONMIL-A-8625 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL
NUT STYLETUBE COUPLING
THREAD SERIESUN
THREAD DIRECTIONRIGHT-HAND
VERIFIED SUBSTITUTES & CROSS-REFERENCES 14
AS4841Interchangeable
interchangeable cross-reference
interchangeable
AN818-8DInterchangeable
interchangeable cross-reference
interchangeable
AN818-80Interchangeable
interchangeable cross-reference
interchangeable
30211Interchangeable
interchangeable cross-reference
interchangeable
477 702Interchangeable
interchangeable cross-reference
interchangeable
3100766Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 290-20D?
290-20D is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace 290-20D?
There are 14 known substitutes for 290-20D: AS4841, AN818-8D, AN818-80 and 11 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 290-20D?
290-20D is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-287-0271. 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