PartsTable
Technical Data Sheet
PartsTable / MRO / 21-583
21-583 ✓ Verified by PartsTable
— · MRO · MRO_GENERAL
WHAT YOU NEED TO KNOW
Stranded for flexible routing, solid for conduit THHN/THWN dual-rated — check both tables
Ampacity depends on installation method
PRODUCT OVERVIEW

CAPACITOR,VARIABLE,AIR DIELECTRI. Key specifications include material: STEEL LOCATION NOT OTHERWISE SPECIFIED, body_shape: OVAL, design_type: DRY, coolant_type: AIR, overall_width: 11.500 INCHES NOMINAL IN, inlet_location: OFFSET LOCATED ON SAME END OF BODY WITH OUTLET. This product is currently in active production with full OEM support.

This part is cataloged in the Federal Logistics Information System (FLIS) under NSN 6145-00-112-1449, 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→ 21-583
NSN: 6145-00-112-1449
FSC: 6145
CAGE: 07497 — ESSEX GROUP INC TELECOMMUNICATION PRODUCTS DIV (USA)
SPECIFICATIONS
materialSTEEL LOCATION NOT OTHERWISE SPECIFIED
body_shapeOVAL
design_typeDRY
coolant_typeAIR
overall_width11.500 INCHES NOMINAL IN
inlet_locationOFFSET LOCATED ON SAME END OF BODY WITH OUTLET
muffler_designMULTIPASS
overall_height8.250 INCHES NOMINAL IN
overall_length21.750 INCHES NOMINAL IN
baffle_quantity1
outlet_locationOFFSET LOCATED ON SAME END OF BODY WITH INLET
special_featuresSTEEL,ROCKWELL 48 C,2.375 IN. LG,0.875 IN. W,0.278 IN. H,0.328 IN. DIA HOLE IN CENTER IN
NSN6145-00-112-1449
COMPONENT DIAGRAM
WIRE / CABLE — AMPACITY DEPENDS ON INSTALLATION CROSS-SECTION JACKET WIRE SPECIFICATIONS Conductor Size: — Conductor Count: — Voltage Rating: — Insulation: — Temp Rating: — PN: 21-583 · OEM ⚠ VERIFY BEFORE ORDERING Ampacity depends on installation method — conduit ≠ free air ≠ underground. Same wire, different ratings. AWG sizing is inverse — smaller number = thicker wire (4 AWG > 12 AWG) ✓ BROKER TIP Stranded = flexible routing and vibration resistance. Solid = fixed conduit runs only. THHN/THWN = dual rated — check both dry and wet ampacity tables PARTSTABLE TECHNICAL DRAWING — NOT TO SCALE
KEY FEATURES
•
ROUND CONDUCTOR SIZE: 13 AWG SINGLE CONDUCTOR
•
MATERIAL: COPPER CORE CONDUCTOR SINGLE CONDUCTOR
•
NOMINAL CAPACITANCE IN PICOFARADS: 29.5 PER FOOT
•
CONDUCTOR ARRANGEMENT AND QUANTITY: 1 TRIAXIAL
•
STRAND AWG SIZE PER CONDUCTOR: 21 SINGLE CONDUCTOR
•
VOLTAGE RATING: 4000.0 MAXIMUM ROOT MEAN SQUARE (RMS) OPERATING VOLTAGE SINGLE CONDUCTOR
•
STRAND QUANTITY PER CONDUCTOR: 7 SINGLE CONDUCTOR
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)
ROUND CONDUCTOR SIZE13 AWG SINGLE CONDUCTOR
MATERIALCOPPER CORE CONDUCTOR SINGLE CONDUCTOR
NOMINAL CAPACITANCE IN PICOFARADS29.5 PER FOOT
CONDUCTOR ARRANGEMENT AND QUANTITY1 TRIAXIAL
STRAND AWG SIZE PER CONDUCTOR21 SINGLE CONDUCTOR
VOLTAGE RATING4000.0 MAXIMUM ROOT MEAN SQUARE (RMS) OPERATING VOLTAGE SINGLE CONDUCTOR
STRAND QUANTITY PER CONDUCTOR7 SINGLE CONDUCTOR
MATERIALPLASTIC POLYVINYL CHLORIDE (PVC) THIRD POSITION JACKET CABLE
MATERIALCOPPER SECOND POSITION SHIELD BRAID METALLIC CABLE
CROSS SECTION OUTSIDE DIAMETER0.490 INCHES NOMINAL IN
VERIFIED SUBSTITUTES & CROSS-REFERENCES 8
21583Interchangeable
interchangeable cross-reference
interchangeable
AA-1257Interchangeable
interchangeable cross-reference
interchangeable
P79-8Interchangeable
interchangeable cross-reference
interchangeable
PB2440-16Interchangeable
interchangeable cross-reference
interchangeable
20232Interchangeable
interchangeable cross-reference
interchangeable
2385995Interchangeable
interchangeable cross-reference
interchangeable
LIFECYCLE
StatusACTIVE
AvailabilityOEM and secondary market
RoHS CompliantEAR99Not HAZMAT
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FREQUENTLY ASKED QUESTIONS
What is 21-583?
21-583 is a CAPACITOR,VARIABLE,AIR DIELECTRI. It is classified as a MRO (MRO_GENERAL).
What parts can replace 21-583?
There are 8 known substitutes for 21-583: 21583, AA-1257, P79-8 and 5 more. Substitute compatibility should be verified for your specific system.
What is the NSN for 21-583?
21-583 is cataloged in the Federal Logistics Information System (FLIS) under NSN 6145-00-112-1449. 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