PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

PM21399Extender Card,electronic Test

Mason Electric Co. Dba Mason Controls · NSN 5998-00-003-6115 · FSC 5998 · Circuit Card Assembly
Verified by PartsTable
NSN 5998-00-003-6115 — this item is cataloged by the U.S. Government under National Stock Number 5998-00-003-6115. Primary manufacturer part number: PM21399.
Features
  • Extender Card,electronic Test — FSC 5998
  • 6 verified cross-references
  • Primary manufacturer: Mason Electric Co. Dba Mason Controls
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Extender Card,electronic Test, cataloged under National Stock Number 5998-00-003-6115, is classified within Federal Supply Class 5998 (Circuit Card Assembly) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Mason Electric Co. Dba Mason Controls. This item has 6 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: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5998-00-003-6115
Primary Part NumberPM21399
Item NameExtender Card,electronic Test
FSC / FSG5998 / 59 — Circuit Card Assembly
ManufacturerMason Electric Co. Dba Mason Controls
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeQ
Unit of IssueEA
SMR CodeJN
Weight0.0370 lbs
Cube0.0317 cu ft
Verified Substitutes 8
5110-00-083-004221-399 INTERCHANGEABLE
Rasp,hand
Stanley Tools Div of Stanley Works
4730-00-142-2010SAE-J1508 TYPE B SIZE 79 INTERCHANGEABLE
Clamp,hose
Sae International Dba Sae International
5306-00-151-1723 INTERCHANGEABLE
Bolt,machine
2990-00-846-29421551 INTERCHANGEABLE
Muffler,exhaust
Arvin Industries Inc
3030-01-053-13407905629-00 INTERCHANGEABLE
Belt,flat
L3 Technologies, Inc. Dba Communication Systems-West Div Communication Systems-West
5950-01-202-304521399 INTERCHANGEABLE
Transformer,power
Robert M. Hadley Company, Inc.
6140-01-240-9700021399-000 INTERCHANGEABLE
Thermostat,battery Assembly
Saft America Inc. Dba Tadiran Batteries Div Aviation Division
4820-01-583-778821399 INTERCHANGEABLE
Milspec Plug
Elliott Machine Works Inc
Cross-Reference Index
Part NumberManufacturer
PM21399 PRIMARY Mason Electric Co. Dba Mason Controls (USA)
21399 Unison Industries Llc (USA)
21399 Mason Electric Co. Dba Mason Controls (USA)
21399 Amphenol Corp Div Amphenol Aerospace Operations (USA)
PM-21399 Unison Industries Llc (USA)
PM-21399 Amphenol Corp Div Amphenol Aerospace Operations (USA)
Related Parts
5110-00-083-0042INTERCHANGEABLE
RASP,HAND
21-399
4730-00-142-2010INTERCHANGEABLE
CLAMP,HOSE
SAE-J1508 TYPE B SIZE 79
5306-00-151-1723INTERCHANGEABLE
BOLT,MACHINE
2990-00-846-2942INTERCHANGEABLE
MUFFLER,EXHAUST
1551
3030-01-053-1340INTERCHANGEABLE
BELT,FLAT
7905629-00
5950-01-202-3045INTERCHANGEABLE
TRANSFORMER,POWER
21399
6140-01-240-9700INTERCHANGEABLE
THERMOSTAT,BATTERY ASSEMBLY
021399-000
4820-01-583-7788INTERCHANGEABLE
MILSPEC PLUG
21399

Frequently Asked Questions

What is NSN 5998-00-003-6115?

NSN 5998-00-003-6115 is a Extender Card,electronic Test, manufactured by Mason Electric Co. Dba Mason Controls, classified under FSC 5998 (Circuit Card Assembly). Status: active.

What are the part numbers for NSN 5998-00-003-6115?

NSN 5998-00-003-6115 has 6 cross-referenced part numbers: PM21399 (Mason Electric Co. Dba Mason Controls), 21399 (Unison Industries Llc), 21399 (Mason Electric Co. Dba Mason Controls), 21399 (Amphenol Corp Div Amphenol Aerospace Operations), PM-21399 (Unison Industries Llc) and 1 more.

What NSN replaces 5998-00-003-6115?

There are 8 known substitutes for 5998-00-003-6115: 5110-00-083-0042, 4730-00-142-2010, 5306-00-151-1723 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of PM21399?

Key specifications for PM21399: Special Features: ALUMINUM ALLOY,BLACK ANODIZE,1.000 IN. LG,0.810 IN. W,0.858 IN. H,CHANNEL SHAPED,ROUNDED CORNERS LEGS OF CHANNEL,0.472 IN. DIA HOLE CENTRALLY LOCATED IN WEB OF CHANNEL,HOLE W/0.062 IN. W KEY 0.031 IN. H ONE SIDE,ON CENTER LINE PARALLEL TO LENGTH IN; Special Features: ALUMINUM ALLOY,BLACK ANODIZE,1.000 IN. LG,0.810 IN. W,0.858 IN. H,CHANNEL SHAPED,ROUNDED CORNERS LEGS OF CHANNEL,0.472 IN. DIA HOLE CENTRALLY LOCATED IN WEB OF CHANNEL,HOLE W/0.062 IN. W KEY 0.031 IN. H ONE SIDE,ON CENTER LINE PARALLEL TO LENGTH IN. 2 total characteristics are documented in the Federal Logistics Information System.

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