PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21439Circuit Card Assembly

Rex Systems Incorporated Dba Rex Systems Inc · NSN 5998-00-421-6531 · FSC 5998 · Circuit Card Assembly
Verified by PartsTable
NSN 5998-00-421-6531 — this item is cataloged by the U.S. Government under National Stock Number 5998-00-421-6531. Primary manufacturer part number: 21439.
Features
  • Circuit Card Assembly — FSC 5998
  • 3 verified cross-references
  • Primary manufacturer: Rex Systems Incorporated Dba Rex Systems Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Circuit Card Assembly, cataloged under National Stock Number 5998-00-421-6531, is classified within Federal Supply Class 5998 (Circuit Card Assembly) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Rex Systems Incorporated Dba Rex Systems Inc. This item has 3 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5998-00-421-6531
Primary Part Number21439
Item NameCircuit Card Assembly
FSC / FSG5998 / 59 — Circuit Card Assembly
ManufacturerRex Systems Incorporated Dba Rex Systems Inc
StatusCANCELLED
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Shelf Life Code0
Criticality CodeQ
Unit of IssueEA
SMR CodeJF
Weight0.1210 lbs
Cube0.0169 cu ft
Verified Substitutes 8
No Item Name Available
6685-00-063-0477 INTERCHANGEABLE
Thermometer,self-Indicating
5930-00-104-8571547456-3 INTERCHANGEABLE
Switch,thermostatic
Honeywell International, Inc Div Aerospace-Tucson
4720-00-105-2917 INTERCHANGEABLE
Hose,nonmetallic
1680-00-485-428921439 INTERCHANGEABLE
Adapter,valve,co2
Kidde Technologies, Inc Div Kidde Aerospace and Defense
5945-01-263-2806CUA-42-70003 INTERCHANGEABLE
Relay,electromagnetic
Te Connectivity Corporation
5360-01-351-120721439 INTERCHANGEABLE
Spring,helical,compression
Parker Hannifin Corporation Div Hydraulic Systems Division
2935-01-601-182321439 INTERCHANGEABLE
Cooler,lubricating Oil,engine
J and K Electronics
Cross-Reference Index
Part NumberManufacturer
21439 Sypris Electronics, Llc Dba Sypris Electronics Llc (USA)
21439 Bae Systems Information and Electronic Systems Integration Inc. (USA)
21439 PRIMARY Rex Systems Incorporated Dba Rex Systems Inc (USA)
Related Parts
5895-00-848-8941SUCCESSOR
NO ITEM NAME AVAILABLE
6685-00-063-0477INTERCHANGEABLE
THERMOMETER,SELF-INDICATING
5930-00-104-8571INTERCHANGEABLE
SWITCH,THERMOSTATIC
547456-3
4720-00-105-2917INTERCHANGEABLE
HOSE,NONMETALLIC
1680-00-485-4289INTERCHANGEABLE
ADAPTER,VALVE,CO2
21439
5945-01-263-2806INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
CUA-42-70003
5360-01-351-1207INTERCHANGEABLE
SPRING,HELICAL,COMPRESSION
21439
2935-01-601-1823INTERCHANGEABLE
COOLER,LUBRICATING OIL,ENGINE
21439

Frequently Asked Questions

What is NSN 5998-00-421-6531?

NSN 5998-00-421-6531 is a Circuit Card Assembly, manufactured by Rex Systems Incorporated Dba Rex Systems Inc, classified under FSC 5998 (Circuit Card Assembly). Status: cancelled.

What are the part numbers for NSN 5998-00-421-6531?

NSN 5998-00-421-6531 has 3 cross-referenced part numbers: 21439 (Sypris Electronics, Llc Dba Sypris Electronics Llc), 21439 (Bae Systems Information and Electronic Systems Integration Inc.), 21439 (Rex Systems Incorporated Dba Rex Systems Inc).

What NSN replaces 5998-00-421-6531?

There are 8 known substitutes for 5998-00-421-6531: 5895-00-848-8941, 6685-00-063-0477, 5930-00-104-8571 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21439?

Key specifications for 21439: Overall Length: 1.000 INCHES NOMINAL IN; Overall Width: 1.200 INCHES NOMINAL IN; Special Features: CAPACITOR 1,DIODE 2,PRINTED WIRING BOARD 1; Overall Height: 0.300 INCHES NOMINAL IN. 8 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5998-00-421-6531 still in active supply?

NSN 5998-00-421-6531 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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