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Technical Data Sheet
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A4541 ✓ 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

The CAPACITOR,FIXED,ELECTROLYTIC is a the manufacturer cache protection component designed to preserve data integrity during power loss events in enterprise server and storage controller environments. Key specifications include material: COPPER ALLOY OVERALL, leg_length: 1.406 INCHES NOMINAL FIRST END IN, seat_angle: 45.0 DEGREES ALL ENDS, thread_class: 2A ALL ENDS A, adjustability: NONADJUSTABLE, overall_width: 2.500 INCHES MAXIMUM IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-249-2026, 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
A4541
NSN: 4730-00-249-2026
FSC: 4730
CAGE: 41947 — MUELLER BRASS CO. (USA)
SPECIFICATIONS
materialCOPPER ALLOY OVERALL
leg_length1.406 INCHES NOMINAL FIRST END IN
seat_angle45.0 DEGREES ALL ENDS
thread_class2A ALL ENDS A
adjustabilityNONADJUSTABLE
overall_width2.500 INCHES MAXIMUM IN
terminal_typeCONNECTOR, RECEPTACLE
overall_height4.000 INCHES MAXIMUM IN
overall_length5.000 INCHES MAXIMUM IN
connection_typeTHREADED EXTERNAL TUBE ALL ENDS
connection_styleFLARED (TUBE) ALL ENDS
dc_voltage_rating24.0 VOLTS NOMINAL
NSN4730-00-249-2026
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: A4541 · 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 CLASS: 2A ALL ENDS A
•
CONNECTION TYPE: THREADED EXTERNAL TUBE ALL ENDS
•
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED: 0.625 INCHES ALL ENDS IN
•
THREAD SERIES DESIGNATOR: UNF ALL ENDS
•
MATERIAL: COPPER ALLOY OVERALL
•
MATERIAL DOCUMENT AND CLASSIFICATION: SAE 72 0R 88 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
•
FURNISHED ITEMS AND QUANTITY: 3 TUBE COUPLING NUT W/SLEEVE
•
SEAT ANGLE: 45.0 DEGREES ALL ENDS
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)
THREAD CLASS2A ALL ENDS A
CONNECTION TYPETHREADED EXTERNAL TUBE ALL ENDS
NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED0.625 INCHES ALL ENDS IN
THREAD SERIES DESIGNATORUNF ALL ENDS
MATERIALCOPPER ALLOY OVERALL
MATERIAL DOCUMENT AND CLASSIFICATIONSAE 72 0R 88 ASSN STD SINGLE MATERIAL RESPONSE OVERALL
FURNISHED ITEMS AND QUANTITY3 TUBE COUPLING NUT W/SLEEVE
SEAT ANGLE45.0 DEGREES ALL ENDS
NONDEFINITIVE SPEC/STD DATA17 FIGURE
MEDIA FOR WHICH DESIGNEDREFRIGERATION COMPOUND SINGLE RESPONSE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 26
8019136P41Interchangeable
interchangeable cross-reference
interchangeable
C9857PInterchangeable
interchangeable cross-reference
interchangeable
197-8-210SInterchangeable
interchangeable cross-reference
interchangeable
140-9-1562Interchangeable
interchangeable cross-reference
interchangeable
192870Interchangeable
interchangeable cross-reference
interchangeable
140-009-15Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is A4541?
A4541 is a CAPACITOR,FIXED,ELECTROLYTIC.
What parts can replace A4541?
There are 26 known substitutes for A4541: 8019136P41, C9857P, 197-8-210S and 23 more. Substitute compatibility should be verified for your specific system.
Is A4541 still available?
A4541 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