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W1903 ✓ 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 COUPLING,TUBE is a the manufacturer industrial component. Key specifications include material: COPPER OVERALL, connection_type: UNTHREADED INTERNAL TUBE ALL ENDS, connection_style: PLAIN (TUBE) ALL ENDS, style_designator: BEVELED BOTH ENDS, nominal_overall_length: 1.250 INCHES IN, nominal_outside_diameter_tube_accommodated: 0.625 INCHES ALL ENDS IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-722-1910, 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
W1903
NSN: 4730-00-722-1910
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialCOPPER OVERALL
connection_typeUNTHREADED INTERNAL TUBE ALL ENDS
connection_stylePLAIN (TUBE) ALL ENDS
style_designatorBEVELED BOTH ENDS
nominal_overall_length1.250 INCHES IN
nominal_outside_diameter_tube_accommodated0.625 INCHES ALL ENDS IN
NSN4730-00-722-1910
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: W1903 · 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
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.625 INCHES ALL ENDS IN
•
MATERIAL: COPPER OVERALL
•
STYLE DESIGNATOR: BEVELED BOTH ENDS
•
NOMINAL OVERALL LENGTH: 1.250 INCHES IN
•
CONNECTION TYPE: UNTHREADED INTERNAL TUBE ALL ENDS
•
CONNECTION STYLE: PLAIN (TUBE) ALL ENDS
TECHNICAL CHARACTERISTICS (FLIS)
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES ALL ENDS IN
MATERIALCOPPER OVERALL
STYLE DESIGNATORBEVELED BOTH ENDS
NOMINAL OVERALL LENGTH1.250 INCHES IN
CONNECTION TYPEUNTHREADED INTERNAL TUBE ALL ENDS
CONNECTION STYLEPLAIN (TUBE) ALL ENDS
VERIFIED SUBSTITUTES & CROSS-REFERENCES 12
AN4Interchangeable
interchangeable cross-reference
interchangeable
ANJC482Interchangeable
interchangeable cross-reference
interchangeable
3101004Interchangeable
interchangeable cross-reference
interchangeable
665-55-118Interchangeable
interchangeable cross-reference
interchangeable
10M400A1Interchangeable
interchangeable cross-reference
interchangeable
20871Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is W1903?
W1903 is a COUPLING,TUBE.
What parts can replace W1903?
There are 12 known substitutes for W1903: AN4, ANJC482, 3101004 and 9 more. Substitute compatibility should be verified for your specific system.
Is W1903 still available?
W1903 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