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Technical Data Sheet
PartsTable / COMPONENT / Z542
Z542 ✓ 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 angle: 90.0 DEGREES, height: 1.062 INCHES MAXIMUM IN, material: STEEL OVERALL, shank_length: 0.312 INCHES NOMINAL IN, overall_length: 3.200 INCHES MAXIMUM IN, drive_end_shape: SQUARE SINGLE END INTERNAL. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-172-0047, 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
Z542
NSN: 4730-00-172-0047
FSC: 4730
CAGE: 10695 — TAYLOR-DUNN CORPORATION DBA METRO CROWN INTERNATIONAL (USA)
SPECIFICATIONS
angle90.0 DEGREES
height1.062 INCHES MAXIMUM IN
materialSTEEL OVERALL
shank_length0.312 INCHES NOMINAL IN
overall_length3.200 INCHES MAXIMUM IN
drive_end_shapeSQUARE SINGLE END INTERNAL
special_featuresSURFACE OR THROAT LOCATED BALL CHECK VALVE; E/ISHIP, OHIOCLASS SSN (TRIDENT)
style_designatorINTERNAL-INTERNAL
features_providedMANUAL TOOL
surface_treatmentCHROMIUM OVERALL
drive_surface_size0.750 INCHES NOMINAL SINGLE END IN
width_across_flats0.438 INCHES NOMINAL IN
NSN4730-00-172-0047
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: Z542 · 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
•
HEIGHT: 1.062 INCHES MAXIMUM IN
•
ANGLE: 90.0 DEGREES
•
SCREW THREAD SERIES DESIGNATOR: PTF-SPL SHORT
•
THREAD QUANTITY PER INCH: 27
•
WIDTH ACROSS FLATS: 0.438 INCHES NOMINAL IN
•
ASSEMBLY CLEARANCE RADIUS: 0.625 INCHES MAXIMUM IN
•
NOMINAL THREAD SIZE: 0.125 INCHES IN
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)
HEIGHT1.062 INCHES MAXIMUM IN
SPECIAL FEATURESSURFACE OR THROAT LOCATED BALL CHECK VALVE; E/ISHIP, OHIOCLASS SSN (TRIDENT)
ANGLE90.0 DEGREES
SCREW THREAD SERIES DESIGNATORPTF-SPL SHORT
THREAD QUANTITY PER INCH27
WIDTH ACROSS FLATS0.438 INCHES NOMINAL IN
ASSEMBLY CLEARANCE RADIUS0.625 INCHES MAXIMUM IN
NOMINAL THREAD SIZE0.125 INCHES IN
MATERIAL DOCUMENT AND CLASSIFICATIONQQ-N-281 CLASS B FED SPEC SINGLE MATERIAL RESPONSE OVERALL
STYLE DESIGNATORANGLE
VERIFIED SUBSTITUTES & CROSS-REFERENCES 35
324244Interchangeable
interchangeable cross-reference
interchangeable
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
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is Z542?
Z542 is a CAPACITOR,FIXED,ELECTROLYTIC.
What parts can replace Z542?
There are 35 known substitutes for Z542: 324244, 122-660345 PC 30, 200954 and 32 more. Substitute compatibility should be verified for your specific system.
Is Z542 still available?
Z542 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