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Technical Data Sheet
PartsTable / MRO / P28-8
P28-8 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
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 material: COPPER, body_type: SOLID, head_type: SOLID, body_style: W/O MTG FACILITIES, AXIAL TERMINALS, body_width: 0.625 INCHES NOMINAL IN, body_height: 0.625 INCHES NOMINAL IN. This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-287-3281, 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
MRO→ MRO_GENERAL→ P28-8
NSN: 4730-00-287-3281
FSC: 4730
CAGE: 79172 — SIEMENS WATER TECHNOLOGIES CORP. DIV WALLACE & TIERNAN PRODUCTS (USA)
SPECIFICATIONS
materialCOPPER
body_typeSOLID
head_typeSOLID
body_styleW/O MTG FACILITIES, AXIAL TERMINALS
body_width0.625 INCHES NOMINAL IN
body_height0.625 INCHES NOMINAL IN
body_length1.688 INCHES NOMINAL IN
body_diameter0.625 INCHES NOMINAL IN
hole_diameter0.250 INCHES NOMINAL IN
drive_end_styleHEXAGON
terminal_length1.625 INCHES MINIMUM IN
connection_stylePLAIN
NSN4730-00-287-3281
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: P28-8 · 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
•
HEAD TYPE: SOLID
•
DRIVE END STYLE: HEXAGON
•
SPECIFICATION/STANDARD DATA: 81343-J531 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
•
THREAD DIRECTION: RIGHT-HAND EXTERNAL
•
NOMINAL PIPE SIZE FOR WHICH DESIGNED: 0.125 INCHES IN
•
MATERIAL: COPPER ALLOY OVERALL
•
NONDEFINITIVE SPEC/STD DATA: 2A FIGURE A
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)
HEAD TYPESOLID
END ITEM IDENTIFICATIONGRUMMAN A-10 AIRCRAFT; HIGH-MOBILITY ARTILLERY ROCKET SYSTEM (HIMARS)
DRIVE END STYLEHEXAGON
SPECIFICATION/STANDARD DATA81343-J531 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
THREAD DIRECTIONRIGHT-HAND EXTERNAL
NOMINAL PIPE SIZE FOR WHICH DESIGNED0.125 INCHES IN
MATERIALCOPPER ALLOY OVERALL
NONDEFINITIVE SPEC/STD DATA2A FIGURE A
NOMINAL THREAD SIZE0.125 INCHES EXTERNAL IN
CONNECTION STYLEPLAIN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 29
19878Interchangeable
interchangeable cross-reference
interchangeable
4730PL0773105Interchangeable
interchangeable cross-reference
interchangeable
2EH663Interchangeable
interchangeable cross-reference
interchangeable
2708-1-2-5AInterchangeable
interchangeable cross-reference
interchangeable
SN1105Interchangeable
interchangeable cross-reference
interchangeable
F5956Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusCANCELLED
Availability—
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is P28-8?
P28-8 is a CAPACITOR,FIXED,PAPER DIELECTRIC. It is classified as a MRO (MRO_GENERAL).
What parts can replace P28-8?
There are 29 known substitutes for P28-8: 19878, 4730PL0773105, 2EH663 and 26 more. Substitute compatibility should be verified for your specific system.
Is P28-8 still available?
P28-8 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