PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-391Contact,electrical

Eaton Corp Opns & Technical Center · NSN 5999-00-499-6276 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-499-6276 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-499-6276. Primary manufacturer part number: 21-391.
Features
  • Contact,electrical — FSC 5999
  • Current Rating in Amps: 71.0
  • Terminal Type and Quantity: 1 EYELET AXIALLY AT ONE END
  • Precious Material and Weight: 0.005 SILVER GRAINS, TROY
  • Surface Treatment: SILVER BODY AND CONTACT
  • Point Diameter: 0.250 INCHES NOMINAL IN
  • Style Designator: FLAT LEAF CONTACT W/ ROUND FLATTED FIXED POINT
  • Point Height: 0.063 INCHES NOMINAL IN
Applications
  • Applications requiring Copper Alloy Body and Contact construction
General Description

The Contact,electrical, cataloged under National Stock Number 5999-00-499-6276, is classified within Federal Supply Class 5999 (No Item Name Available) of the Electrical and Electronic Equipment Components group. The primary manufacturer of record is Eaton Corp Opns & Technical Center. Government technical data includes 24 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 7 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-00-499-6276
Primary Part Number21-391
Item NameContact,electrical
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerEaton Corp Opns & Technical Center
StatusACTIVE
Current Rating in Amps71.0
Terminal Type and Quantity1 EYELET AXIALLY AT ONE END
Precious Material and Weight0.005 SILVER GRAINS, TROY
Surface TreatmentSILVER BODY AND CONTACT
Point Diameter0.250 INCHES NOMINAL IN
Style DesignatorFLAT LEAF CONTACT W/ ROUND FLATTED FIXED POINT
Point Height0.063 INCHES NOMINAL IN
Precious MaterialSILVER
Mounting MethodUNTHREADED HOLE(S)
Unthreaded Mounting Hole Diameter0.125 INCHES NOMINAL IN
Mounting Facility Quantity2
Voltage Rating in Volts440.0 AC
Precious Material and LocationBODY AND CONTACT SURFACES SILVER
MaterialCOPPER ALLOY BODY AND CONTACT
Current Rating in Amps71.0
Terminal Type and Quantity1 EYELET AXIALLY AT ONE END
Precious Material and Weight0.005 SILVER GRAINS, TROY
Surface TreatmentSILVER BODY AND CONTACT
Point Diameter0.250 INCHES NOMINAL IN
Style DesignatorFLAT LEAF CONTACT W/ ROUND FLATTED FIXED POINT
Point Height0.063 INCHES NOMINAL IN
Precious MaterialSILVER
Mounting MethodUNTHREADED HOLE(S)
Unthreaded Mounting Hole Diameter0.125 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeJ
Verified Substitutes 7
4330-00-277-329721391 INTERCHANGEABLE
Filter Element,fluid
Arvinmeritor Inc
5915-00-412-4384402793-001 INTERCHANGEABLE
Filter,band Pass
Tegam, Inc.
5970-00-616-63352-139-1 INTERCHANGEABLE
Insulator,plate
Precision Aerospace Corporation Dba Precision Engine Control
5930-00-844-847021391 INTERCHANGEABLE
Switch,thermostatic
Sensata Technologies, Inc. Div Sensata Attleboro
4240-01-340-793621391 INTERCHANGEABLE
Strap,safety,industrial
Buckingham Mfg Co Inc
4820-01-424-120221391-001 INTERCHANGEABLE
Valve,linear,directional Control
Sargent Aerospace & Defense, Llc Dba Sargent Controls & Aerospace Div Sargent Controls & Aerospace
5975-01-632-0556 INTERCHANGEABLE
Socket and Cap Asse
Cross-Reference Index
Part NumberManufacturer
62433 Johnson a and Co Inc (USA)
21-391 PRIMARY Eaton Corp Opns & Technical Center (USA)
83039W1ITEM9 Eaton Corp Opns & Technical Center (USA)
83368W1ITEM19 Eaton Corp Opns & Technical Center (USA)
82827W1ITEM36 Eaton Corp Opns & Technical Center (USA)
83052W1ITEM10 Eaton Corp Opns & Technical Center (USA)
4860ALT1ITEM2E Eaton Corp Opns & Technical Center (USA)
Related Parts
4330-00-277-3297INTERCHANGEABLE
FILTER ELEMENT,FLUID
21391
5915-00-412-4384INTERCHANGEABLE
FILTER,BAND PASS
402793-001
5970-00-616-6335INTERCHANGEABLE
INSULATOR,PLATE
2-139-1
5930-00-844-8470INTERCHANGEABLE
SWITCH,THERMOSTATIC
21391
4240-01-340-7936INTERCHANGEABLE
STRAP,SAFETY,INDUSTRIAL
21391
4820-01-424-1202INTERCHANGEABLE
VALVE,LINEAR,DIRECTIONAL CONTROL
21391-001
5975-01-632-0556INTERCHANGEABLE
SOCKET AND CAP ASSE

Frequently Asked Questions

What is NSN 5999-00-499-6276?

NSN 5999-00-499-6276 is a Contact,electrical, manufactured by Eaton Corp Opns & Technical Center, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-00-499-6276?

NSN 5999-00-499-6276 has 7 cross-referenced part numbers: 62433 (Johnson a and Co Inc), 21-391 (Eaton Corp Opns & Technical Center), 83039W1ITEM9 (Eaton Corp Opns & Technical Center), 83368W1ITEM19 (Eaton Corp Opns & Technical Center), 82827W1ITEM36 (Eaton Corp Opns & Technical Center) and 2 more.

What NSN replaces 5999-00-499-6276?

There are 7 known substitutes for 5999-00-499-6276: 4330-00-277-3297, 5915-00-412-4384, 5970-00-616-6335 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21-391?

Key specifications for 21-391: Current Rating in Amps: 71.0; Overall Length: 1.594 INCHES NOMINAL IN; Terminal Type and Quantity: 1 EYELET AXIALLY AT ONE END; Precious Material and Weight: 0.005 SILVER GRAINS, TROY. 30 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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