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W40123 ✓ 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,PRE. Key specifications include material: CERAMIC ENCLOSURE, body_style: CYLINDRICAL BUSHING MOUNTED, body_length: 1.469 INCHES NOMINAL IN, shaft_style: ROUND, SLOTTED, shaft_length: 1.000 INCHES NOMINAL IN, actuator_type: SINGLE SHAFT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-815-1173, 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
W40123
NSN: 4730-00-815-1173
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialCERAMIC ENCLOSURE
body_styleCYLINDRICAL BUSHING MOUNTED
body_length1.469 INCHES NOMINAL IN
shaft_styleROUND, SLOTTED
shaft_length1.000 INCHES NOMINAL IN
actuator_typeSINGLE SHAFT
body_diameter0.500 INCHES NOMINAL IN
overall_width0.880 INCHES MINIMUM IN
overall_height0.650 INCHES MAXIMUM IN
overall_length0.880 INCHES MINIMUM IN
shaft_diameter0.250 INCHES NOMINAL IN
mounting_methodTHREADED STUD(S)
NSN4730-00-815-1173
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: W40123 · 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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 28
W4017Interchangeable
interchangeable cross-reference
interchangeable
MS35929-6Interchangeable
interchangeable cross-reference
interchangeable
AA59451-6Interchangeable
interchangeable cross-reference
interchangeable
41121-2Interchangeable
interchangeable cross-reference
interchangeable
5000-5KInterchangeable
interchangeable cross-reference
interchangeable
MS35929-2Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is W40123?
W40123 is a RESISTOR,VARIABLE,WIRE WOUND,PRE.
What parts can replace W40123?
There are 28 known substitutes for W40123: W4017, MS35929-6, AA59451-6 and 25 more. Substitute compatibility should be verified for your specific system.
Is W40123 still available?
W40123 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