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Technical Data Sheet
PartsTable / COMPONENT / 3903-4-4-C
3903-4-4-C ✓ 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,PIPE TO TUBE is a the manufacturer industrial component. Key specifications include flow_angle: 90.0 DEGREES, seat_angle: 37.0 DEGREES ALL ENDS, connection_type: THREADED EXTERNAL TUBE SECOND END, connection_style: SWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END, special_features: 316 STAINLESS STEEL, media_for_which_designed: HYDRAULIC FLUID SECOND RESPONSE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-137-7876, 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
3903-4-4-C
NSN: 4730-00-137-7876
FSC: 4730
CAGE: 87373 — PARKER-HANNIFIN CORPORATION DBA PNEUTRONICS DIV HOSE PRODUCTS DIVISION (USA)
SPECIFICATIONS
flow_angle90.0 DEGREES
seat_angle37.0 DEGREES ALL ENDS
connection_typeTHREADED EXTERNAL TUBE SECOND END
connection_styleSWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
special_features316 STAINLESS STEEL
media_for_which_designedHYDRAULIC FLUID SECOND RESPONSE
nominal_outside_diameter_tube_accommodated0.250 INCHES ALL ENDS IN
NSN4730-00-137-7876
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 3903-4-4-C · 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
•
SPECIFICATION/STANDARD DATA: 81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
MATERIAL: STEEL OVERALL
•
NOMINAL THREAD SIZE: 0.438 INCHES ALL ENDS IN
•
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: J514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
•
FLOW ANGLE: 90.0 DEGREES
•
CONNECTION STYLE: SWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
•
THREAD CLASS: 2B FIRST END
•
MAXIMUM OPERATING TEMP: 400.0 FAHRENHEIT SINGLE RESPONSE DEGF
TECHNICAL CHARACTERISTICS (FLIS)
SPECIFICATION/STANDARD DATA81343-J514 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
MATERIALSTEEL OVERALL
NOMINAL THREAD SIZE0.438 INCHES ALL ENDS IN
SURFACE TREATMENT DOCUMENT AND CLASSIFICATIONJ514 ASSN STD SINGLE TREATMENT RESPONSE OVERALL
FLOW ANGLE90.0 DEGREES
CONNECTION STYLESWIVEL NUT, FLARE (TUBE) STYLE 3 OPTIONAL END FIRST END
THREAD CLASS2B FIRST END
MAXIMUM OPERATING TEMP400.0 FAHRENHEIT SINGLE RESPONSE DEGF
THREAD CLASS2A SECOND END A
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.250 INCHES ALL ENDS IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
4446XXInterchangeable
interchangeable cross-reference
interchangeable
B-15Interchangeable
interchangeable cross-reference
interchangeable
HV-16Interchangeable
interchangeable cross-reference
interchangeable
AN3050-16Interchangeable
interchangeable cross-reference
interchangeable
11-1-16Interchangeable
interchangeable cross-reference
interchangeable
FON1-3510.16Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 3903-4-4-C?
3903-4-4-C is a ADAPTER,STRAIGHT,PIPE TO TUBE.
What parts can replace 3903-4-4-C?
There are 21 known substitutes for 3903-4-4-C: 4446XX, B-15, HV-16 and 18 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 3903-4-4-C?
3903-4-4-C is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-137-7876. 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