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PartsTable / COMPONENT / NIL-F-5509
NIL-F-5509 ✓ 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 OVERALL, leg_length: 1.219 INCHES NOMINAL ALL ENDS IN, seat_angle: 37.0 DEGREES ALL ENDS, thread_class: 3A ALL ENDS A, connection_type: THREADED EXTERNAL TUBE ALL ENDS, connection_style: FLARED (TUBE) ALL ENDS. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-256-2294, 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
NIL-F-5509
NSN: 4730-00-256-2294
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
materialALUMINUM ALLOY OVERALL
leg_length1.219 INCHES NOMINAL ALL ENDS IN
seat_angle37.0 DEGREES ALL ENDS
thread_class3A ALL ENDS A
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARED (TUBE) ALL ENDS
surface_treatmentANODIZE OVERALL
nominal_thread_size0.750 INCHES ALL ENDS IN
thread_series_designatorUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
specification/standard_data88044-AN827 GOVERNMENT STANDARD AND 81343-ASAS4841 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
nominal_outside_diameter_tube_accommodated0.500 INCHES ALL ENDS IN
NSN4730-00-256-2294
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: NIL-F-5509 · 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
•
MATERIAL: ALUMINUM ALLOY OVERALL
•
SPECIFICATION/STANDARD DATA: 88044-AN827 GOVERNMENT STANDARD AND 81343-ASAS4841 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.500 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: UNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
THREAD CLASS: 3A ALL ENDS A
•
SURFACE TREATMENT: ANODIZE OVERALL
•
CONNECTION STYLE: FLARED (TUBE) ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALALUMINUM ALLOY OVERALL
SPECIFICATION/STANDARD DATA88044-AN827 GOVERNMENT STANDARD AND 81343-ASAS4841 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.500 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNIFIED NATIONAL JOINT FINE (UNJF) ALL ENDS
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
THREAD CLASS3A ALL ENDS A
SURFACE TREATMENTANODIZE OVERALL
CONNECTION STYLEFLARED (TUBE) ALL ENDS
SEAT ANGLE37.0 DEGREES ALL ENDS
LEG LENGTH1.219 INCHES NOMINAL ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 10
2145Interchangeable
interchangeable cross-reference
interchangeable
0400-0009Interchangeable
interchangeable cross-reference
interchangeable
G250Interchangeable
interchangeable cross-reference
interchangeable
RG250KInterchangeable
interchangeable cross-reference
interchangeable
SG250-02Interchangeable
interchangeable cross-reference
interchangeable
AS4841Interchangeable
Same NIIN cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is NIL-F-5509?
NIL-F-5509 is a ADAPTER,STRAIGHT,TUBE TO BOSS.
What parts can replace NIL-F-5509?
There are 10 known substitutes for NIL-F-5509: 2145, 0400-0009, G250 and 7 more. Substitute compatibility should be verified for your specific system.
Is NIL-F-5509 still available?
NIL-F-5509 is currently cancelled.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026