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PartsTable / COMPONENT / 503-129
503-129 ✓ 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

CONNECTOR,RECEPTACLE,ELECTRICAL. Key specifications include material: STEEL OVERALL, overall_width: 0.391 INCHES NOMINAL IN, inside_diameter: 1.578 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN, style_designator: WIRE, surface_treatment: CADMIUM OVERALL, fastening_device_type: SPRING TENSION. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-887-2749, 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
503-129
NSN: 4730-00-887-2749
FSC: 4730
CAGE: 44940 — CUMMINS POWER GENERATION INC. (USA)
SPECIFICATIONS
materialSTEEL OVERALL
overall_width0.391 INCHES NOMINAL IN
inside_diameter1.578 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
style_designatorWIRE
surface_treatmentCADMIUM OVERALL
fastening_device_typeSPRING TENSION
NSN4730-00-887-2749
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 503-129 · 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: STEEL OVERALL
•
STYLE DESIGNATOR: WIRE
•
SURFACE TREATMENT: CADMIUM OVERALL
•
INSIDE DIAMETER: 1.578 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
•
FASTENING DEVICE TYPE: SPRING TENSION
TECHNICAL CHARACTERISTICS (FLIS)
MATERIALSTEEL OVERALL
STYLE DESIGNATORWIRE
SURFACE TREATMENTCADMIUM OVERALL
INSIDE DIAMETER1.578 INCHES MINIMUM AND 1.750 INCHES MAXIMUM IN
OVERALL WIDTH0.391 INCHES NOMINAL IN
FASTENING DEVICE TYPESPRING TENSION
VERIFIED SUBSTITUTES & CROSS-REFERENCES 21
C24Interchangeable
interchangeable cross-reference
interchangeable
PNT104-70-32Interchangeable
interchangeable cross-reference
interchangeable
175-7008SSInterchangeable
interchangeable cross-reference
interchangeable
600080-233-001Interchangeable
interchangeable cross-reference
interchangeable
A30Interchangeable
interchangeable cross-reference
interchangeable
520944Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 503-129?
503-129 is a CONNECTOR,RECEPTACLE,ELECTRICAL.
What parts can replace 503-129?
There are 21 known substitutes for 503-129: C24, PNT104-70-32, 175-7008SS and 18 more. Substitute compatibility should be verified for your specific system.
Is 503-129 still available?
503-129 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