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PartsTable / COMPONENT / 21856-2 PIECE 9T017
21856-2 PIECE 9T017 ✓ 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 color: BLACK, width: 0.184 INCHES NOMINAL IN, length: 0.438 INCHES NOMINAL IN, radius: 0.375 INCHES NOMINAL IN, end_type: CLAMP SQUEEZE FIRST END, material: PLASTIC TANK FIRST TANK LEFT SIDE. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-036-2552, 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
21856-2 PIECE 9T017
NSN: 4730-00-036-2552
FSC: 4730
CAGE: 57574 — VELAN VALVE CORP. (USA)
SPECIFICATIONS
colorBLACK
width0.184 INCHES NOMINAL IN
length0.438 INCHES NOMINAL IN
radius0.375 INCHES NOMINAL IN
end_typeCLAMP SQUEEZE FIRST END
materialPLASTIC TANK FIRST TANK LEFT SIDE
core_typeCORRUGATED FIN
thickness0.184 INCHES NOMINAL IN
body_styleROUND, TERMINAL/TERMINALS IN OPPOSITE SURFACE
core_width27.625 INCHES NOMINAL IN
fan_shroudINCLUDED
shaft_typeRECTANGULAR/SQUARE, THREADED HOLE SINGLE ACTUATOR
NSN4730-00-036-2552
COMPONENT DIAGRAM
HOSE FITTING — THREAD TYPE IS CRITICAL END A: — STRAIGHT END B: — SPECIFICATIONS Thread: — Material: — Pressure: — PN: 21856-2 PIECE 9T017 · 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
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
VERIFIED SUBSTITUTES & CROSS-REFERENCES 19
2183Interchangeable
interchangeable cross-reference
interchangeable
83406BInterchangeable
interchangeable cross-reference
interchangeable
XC482Interchangeable
interchangeable cross-reference
interchangeable
10051646Interchangeable
interchangeable cross-reference
interchangeable
SP7012-3-4Interchangeable
interchangeable cross-reference
interchangeable
373291-1Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21856-2 PIECE 9T017?
21856-2 PIECE 9T017 is a CAPACITOR,FIXED,ELECTROLYTIC.
What parts can replace 21856-2 PIECE 9T017?
There are 19 known substitutes for 21856-2 PIECE 9T017: 2183, 83406B, XC482 and 16 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21856-2 PIECE 9T017?
21856-2 PIECE 9T017 is cataloged in the Federal Logistics Information System (FLIS) under NSN 4730-00-036-2552. This indicates validated use in U.S. government and defense supply chains.
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✓ Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
PartsTable Design LLC · partstable.com
Last verified: July 2026