PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

FC21EFClip,electrical

Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M · NSN 5999-00-752-6501 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-752-6501 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-752-6501. Primary manufacturer part number: FC21EF.
Features
  • Clip,electrical — FSC 5999
  • Precious Material and Location: BODY SILVER
  • Material: STEEL BODY
  • Voltage Rating in Volts: 10000.0 AC
  • Hole Accommodation Diameter: 0.812 INCHES NOMINAL IN
  • Precious Material: SILVER
  • Current Rating in Amps: 60.0
  • Unthreaded Mounting Hole Diameter: 0.265 INCHES NOMINAL IN
Applications
  • Applications requiring Steel Body construction
General Description

The Clip,electrical, cataloged under National Stock Number 5999-00-752-6501, 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 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M. Government technical data includes 26 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 8 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-00-752-6501
Primary Part NumberFC21EF
Item NameClip,electrical
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerMilitary Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
StatusACTIVE
Precious Material and LocationBODY SILVER
MaterialSTEEL BODY
Voltage Rating in Volts10000.0 AC
Hole Accommodation Diameter0.812 INCHES NOMINAL IN
Precious MaterialSILVER
Current Rating in Amps60.0
Unthreaded Mounting Hole Diameter0.265 INCHES NOMINAL IN
Mounting MethodUNTHREADED HOLE(S)
Test Data Document81349-MILF21346 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
Mounting Facility Quantity1
Surface TreatmentSILVER BODY
Precious Material and Weight0.005 SILVER GRAINS, TROY
Style DesignatorFERRULE CLIP W/STOP
MaterialSTEEL BODY
Precious Material and LocationBODY SILVER
Voltage Rating in Volts10000.0 AC
Hole Accommodation Diameter0.812 INCHES NOMINAL IN
Precious MaterialSILVER
Current Rating in Amps60.0
Unthreaded Mounting Hole Diameter0.265 INCHES NOMINAL IN
Mounting MethodUNTHREADED HOLE(S)
Test Data Document81349-MILF21346 SPECIFICATION (INCLUDES ENGINEERING TYPE BULLETINS, BROCHURES,ETC., THAT REFLECT SPECIFICATION TYPE DATA IN SPECIFICATION FORMAT; EXCLUDES COMMERCIAL CATALOGS, INDUSTRY DIRECTORIES, AND SIMILAR TRADE PUBLICATIONS, REFLECTING GENERAL TYPE DATA ON CERTAIN ENVIRONMENTAL AND PERFORMANCE REQUIREMENTS AND TEST CONDITIONS THAT ARE SHOWN AS "TYPICAL", "AVERAGE", "NOMINAL", ETC.).
Mounting Facility Quantity1
Surface TreatmentSILVER BODY
Precious Material and Weight0.005 SILVER GRAINS, TROY
Style DesignatorFERRULE CLIP W/STOP
Lifecycle & Compliance
Acquisition StatusACTIVE
Successor5999-00-068-7309
HAZMATNo
Shelf Life Code0
Unit of IssueEA
SMR CodeZ
Weight0.0200 lbs
Cube0.0005 cu ft
Verified Substitutes 12
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Clip,electrical
Cross-Reference Index
Part NumberManufacturer
FC21EF Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
FC21EF Superior Fuse & Manufacturing Co Inc (USA)
100034 Littelfuse, Inc. (USA)
M21346/1-08 Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M
A-A-55507/1 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
AA55507/01-08 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
MILF21346-1 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
A-A-55507/01 Federal Commercial Item Description Promulgated by General Services Administration Washington DC (USA)
Related Parts
SUCCESSOR 5999-00-068-7309 Clip,electrical
5999-00-069-7622SUCCESSOR
CLIP,ELECTRICAL
5999-00-081-6721SUCCESSOR
CLIP,ELECTRICAL
5999-00-465-1283SUCCESSOR
CLIP,ELECTRICAL
5999-00-752-3620SUCCESSOR
CLIP,ELECTRICAL
5999-00-880-9585SUCCESSOR
CLIP,ELECTRICAL
5999-00-892-8349SUCCESSOR
CLIP,ELECTRICAL
5999-00-954-5113SUCCESSOR
CLIP,ELECTRICAL
5999-01-070-4512SUCCESSOR
CLIP,ELECTRICAL
5999-01-281-9837SUCCESSOR
CLIP,ELECTRICAL
5999-01-308-7935SUCCESSOR
CLIP,ELECTRICAL
5999-01-394-1212SUCCESSOR
CLIP,ELECTRICAL

Frequently Asked Questions

What is NSN 5999-00-752-6501?

NSN 5999-00-752-6501 is a Clip,electrical, manufactured by Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-00-752-6501?

NSN 5999-00-752-6501 has 8 cross-referenced part numbers: FC21EF (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), FC21EF (Superior Fuse & Manufacturing Co Inc), 100034 (Littelfuse, Inc.), M21346/1-08 (Military Standards Promulgated by Military Departments Under Authority of Defense Standardization Manual 4120 3-M), A-A-55507/1 (Federal Commercial Item Description Promulgated by General Services Administration Washington DC) and 3 more.

What NSN replaces 5999-00-752-6501?

There are 12 known substitutes for 5999-00-752-6501: 5999-00-068-7309, 5999-00-069-7622, 5999-00-081-6721 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of FC21EF?

Key specifications for FC21EF: Precious Material and Location: BODY SILVER; Material: STEEL BODY; Voltage Rating in Volts: 10000.0 AC; Hole Accommodation Diameter: 0.812 INCHES NOMINAL IN. 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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