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Technical Data Sheet
PartsTable / MRO / 501258
501258 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 RESISTOR,FIXED,COMPOSITION is a the manufacturer industrial component. Key specifications include width: 1.250 INCHES NOMINAL IN, length: 13.000 INCHES NOMINAL IN, end_type: FOLDED LOCATION NOT OTHERWISE SPECIFIED, material: STEEL CORROSION RESISTING OVERALL, fold_type: LOOSE LOCATION NOT OTHERWISE SPECIFIED, bore_shape: STRAIGHT. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-014-2766, 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
MRO→ MRO_GENERAL→ 501258
NSN: 4730-00-014-2766
FSC: 4730
CAGE: 56232 — LOCKHEED MARTIN CORPORATION DIV RMS - MITCHEL FIELD (USA)
SPECIFICATIONS
width1.250 INCHES NOMINAL IN
length13.000 INCHES NOMINAL IN
end_typeFOLDED LOCATION NOT OTHERWISE SPECIFIED
materialSTEEL CORROSION RESISTING OVERALL
fold_typeLOOSE LOCATION NOT OTHERWISE SPECIFIED
bore_shapeSTRAIGHT
seat_angle12.0 DEGREES SECOND END
body_length0.688 INCHES NOMINAL IN
flange_width0.0450 INCHES NOMINAL IN
thread_class3A ALL ENDS A
body_diameter0.318 INCHES NOMINAL IN
bore_diameter0.2500 INCHES NOMINAL IN
NSN4730-00-014-2766
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 501258 · 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
•
SEAT ANGLE: 37.0 DEGREES FIRST END
•
NOMINAL OVERALL LENGTH: 1.828 INCHES IN
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
STYLE DESIGNATOR: FLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
•
MATERIAL: STEEL OVERALL
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.625 INCHES ALL ENDS IN
•
CONNECTION STYLE: FLARED (TUBE) FIRST END
•
THREAD CLASS: 3A ALL ENDS A
TECHNICAL CHARACTERISTICS (FLIS)
SEAT ANGLE37.0 DEGREES FIRST END
NOMINAL OVERALL LENGTH1.828 INCHES IN
THREAD SERIES DESIGNATORUNF ALL ENDS
STYLE DESIGNATORFLARED AND FLARELESS W/ CENTER WRENCHING FACILITY
MATERIALSTEEL OVERALL
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES ALL ENDS IN
CONNECTION STYLEFLARED (TUBE) FIRST END
THREAD CLASS3A ALL ENDS A
SEAT ANGLE12.0 DEGREES SECOND END
CONNECTION STYLEFLARELESS (TUBE) SECOND END
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
N16R50400-0511Interchangeable
interchangeable cross-reference
interchangeable
306-273Interchangeable
interchangeable cross-reference
interchangeable
RC42GF273KInterchangeable
interchangeable cross-reference
interchangeable
501258Interchangeable
interchangeable cross-reference
interchangeable
5012-0058Interchangeable
interchangeable cross-reference
interchangeable
00438400Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 501258?
501258 is a RESISTOR,FIXED,COMPOSITION. It is classified as a MRO (MRO_GENERAL).
What parts can replace 501258?
There are 8 known substitutes for 501258: N16R50400-0511, 306-273, RC42GF273K and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 501258?
501258 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-014-2766. 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