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PartsTable / COMPONENT / MIL-F-3541
MIL-F-3541 ✓ 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

CAPACITOR,FIXED,PAPER DIELECTRIC. Key specifications include angle: 30.0 DEGREES, height: 0.531 INCHES NOMINAL IN, material: STEEL OVERALL, shank_length: 0.125 INCHES NOMINAL IN, thread_class: 2A A, special_features: GRUMMAN AEROSPACE CORP A-10 AIRCRAFT. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-172-0001, 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-3541
NSN: 4730-00-172-0001
FSC: 4730
CAGE: 81349 — MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M
SPECIFICATIONS
angle30.0 DEGREES
height0.531 INCHES NOMINAL IN
materialSTEEL OVERALL
shank_length0.125 INCHES NOMINAL IN
thread_class2A A
special_featuresGRUMMAN AEROSPACE CORP A-10 AIRCRAFT
style_designatorSTRAIGHT
surface_treatmentCADMIUM OVERALL
width_across_flats0.312 INCHES NOMINAL IN
nominal_thread_size0.250 INCHES IN
pressure_relief_methodPORT END
thread_quantity_per_inch28
NSN4730-00-172-0001
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: MIL-F-3541 · 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
•
SHANK LENGTH: 0.625 INCHES NOMINAL IN
•
WIDTH ACROSS FLATS: 0.312 INCHES NOMINAL IN
•
HEIGHT: 0.937 INCHES NOMINAL IN
•
NOMINAL THREAD SIZE: 0.250 INCHES IN
•
THREAD QUANTITY PER INCH: 28
•
SCREW THREAD SERIES DESIGNATOR: SAE-LT
•
MATERIAL: STEEL OVERALL
TYPICAL APPLICATIONS
  • RAID cache protection during power loss events
  • Write-back cache enablement for storage controllers
  • Enterprise server data integrity assurance
  • Hot-swap battery/capacitor replacement in production
TECHNICAL CHARACTERISTICS (FLIS)
SHANK LENGTH0.625 INCHES NOMINAL IN
WIDTH ACROSS FLATS0.312 INCHES NOMINAL IN
HEIGHT0.937 INCHES NOMINAL IN
NOMINAL THREAD SIZE0.250 INCHES IN
SPECIAL FEATURESSUPPORTS HARNISCHFEGER CORP.;MODEL M320T2,CRANE TRUCK MOUNTED,NSN 3810-00-151-4431 AND SURFACE LOCATED BALL CHECK VALVE
THREAD QUANTITY PER INCH28
SCREW THREAD SERIES DESIGNATORSAE-LT
MATERIALSTEEL OVERALL
SURFACE TREATMENTZINC OVERALL
STYLE DESIGNATORSTRAIGHT
VERIFIED SUBSTITUTES & CROSS-REFERENCES 37
122-660345 PC 30Interchangeable
interchangeable cross-reference
interchangeable
200954Interchangeable
interchangeable cross-reference
interchangeable
122-5277738 ITEM 33Interchangeable
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-3541?
MIL-F-3541 is a CAPACITOR,FIXED,PAPER DIELECTRIC.
What parts can replace MIL-F-3541?
There are 37 known substitutes for MIL-F-3541: 122-660345 PC 30, 200954, 122-5277738 ITEM 33 and 34 more. Substitute compatibility should be verified for your specific system.
Is MIL-F-3541 still available?
MIL-F-3541 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