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121758 ✓ 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

RESISTOR,VARIABLE,WIRE WOUND,NON. Key specifications include end_item_identification: PUMP, FUEL TR, part_name_assigned_by_controlling_agency: HOSE ASSY, 57". This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-189-2739, 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
121758
NSN: 4730-00-189-2739
FSC: 4730
CAGE: 77758 — GENERAL MOTORS CORP BALANCE ENGINEERING ACTIVITY (USA)
SPECIFICATIONS
end_item_identificationPUMP, FUEL TR
part_name_assigned_by_controlling_agencyHOSE ASSY, 57"
NSN4730-00-189-2739
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 121758 · 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
•
THREAD SERIES: UNF
•
WIDTH ACROSS FLATS: 0.813 INCHES NOMINAL IN
•
THREAD QUANTITY PER INCH: 18
•
LENGTH TO SHOULDER: 0.500 INCHES NOMINAL IN
•
THREAD DIRECTION: RIGHT-HAND
•
MATERIAL DOCUMENT AND CLASSIFICATION: QQ-B-611 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
TECHNICAL CHARACTERISTICS (FLIS)
THREAD SERIESUNF
WIDTH ACROSS FLATS0.813 INCHES NOMINAL IN
THREAD SERIESUNF
THREAD QUANTITY PER INCH18
LENGTH TO SHOULDER0.500 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.813 INCHES NOMINAL IN
THREAD DIRECTIONRIGHT-HAND
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-B-611 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
SEAT ANGLE45.0 DEGREES NOMINAL
THREAD QUANTITY PER INCH18
VERIFIED SUBSTITUTES & CROSS-REFERENCES 20
A505-2Interchangeable
interchangeable cross-reference
interchangeable
A-5-1-094Interchangeable
interchangeable cross-reference
interchangeable
5TIZ-DInterchangeable
interchangeable cross-reference
interchangeable
5TIZ-AInterchangeable
interchangeable cross-reference
interchangeable
695694Interchangeable
interchangeable cross-reference
interchangeable
A505-12Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 121758?
121758 is a RESISTOR,VARIABLE,WIRE WOUND,NON.
What parts can replace 121758?
There are 20 known substitutes for 121758: A505-2, A-5-1-094, 5TIZ-D and 17 more. Substitute compatibility should be verified for your specific system.
Is 121758 still available?
121758 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