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PartsTable / COMPONENT / MIL-F-3541B
MIL-F-3541B ✓ 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,FIXED,WIRE WOUND,INDUCT. Key specifications include height: 0.500 INCHES NOMINAL IN, material: STEEL CORROSION RESISTING OVERALL, shank_length: 0.188 INCHES NOMINAL IN, special_features: SURFACE OR THROAT LOCATED BALL CHECK VALVE, style_designator: STRAIGHT, width_across_flats: 0.312 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-050-4203, 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
MIL-F-3541B
NSN: 4730-00-050-4203
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
height0.500 INCHES NOMINAL IN
materialSTEEL CORROSION RESISTING OVERALL
shank_length0.188 INCHES NOMINAL IN
special_featuresSURFACE OR THROAT LOCATED BALL CHECK VALVE
style_designatorSTRAIGHT
width_across_flats0.312 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
thread_quantity_per_inch28
screw_thread_series_designatorNPTF
material_document_and_classificationQQ-S-763 FED SPEC SINGLE MATERIAL RESPONSE OVERALL
NSN4730-00-050-4203
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MIL-F-3541B · 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 33
22020Interchangeable
interchangeable cross-reference
interchangeable
69-773Interchangeable
interchangeable cross-reference
interchangeable
300-12Interchangeable
interchangeable cross-reference
interchangeable
4301Interchangeable
interchangeable cross-reference
interchangeable
122-5277671 ITEM 33Interchangeable
interchangeable cross-reference
interchangeable
9412350Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is MIL-F-3541B?
MIL-F-3541B is a RESISTOR,FIXED,WIRE WOUND,INDUCT.
What parts can replace MIL-F-3541B?
There are 33 known substitutes for MIL-F-3541B: 22020, 69-773, 300-12 and 30 more. Substitute compatibility should be verified for your specific system.
Is MIL-F-3541B still available?
MIL-F-3541B 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