PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-491Contact,electrical

Eaton Corp Opns & Technical Center · NSN 5999-00-691-7808 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-691-7808 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-691-7808. Primary manufacturer part number: 21-491.
Features
  • Contact,electrical — FSC 5999
  • Mounting Method: SPRING TENSION
  • Material: SILVER CONTACT
  • Mounting Facility Quantity: 1
  • Precious Material and Weight: 0.005 SILVER GRAINS, TROY
  • Precious Material: SILVER
  • Mounting Method: SPRING TENSION
  • Material: SILVER CONTACT
Applications
  • Applications requiring Silver Contact construction
General Description

The Contact,electrical, cataloged under National Stock Number 5999-00-691-7808, 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 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 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.

Technical Specifications
ParameterValue
NSN5999-00-691-7808
Primary Part Number21-491
Item NameContact,electrical
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerEaton Corp Opns & Technical Center
StatusACTIVE
Mounting MethodSPRING TENSION
MaterialSILVER CONTACT
Mounting Facility Quantity1
Precious Material and Weight0.005 SILVER GRAINS, TROY
Precious MaterialSILVER
Mounting MethodSPRING TENSION
MaterialSILVER CONTACT
Mounting Facility Quantity1
Precious Material and Weight0.005 SILVER GRAINS, TROY
Precious MaterialSILVER
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 7
5950-00-093-83212149-1 INTERCHANGEABLE
Coil,radio Frequency
American Trans-Coil Corp
5110-00-189-337821491 INTERCHANGEABLE
Reamer,hand
Morse Cutting Tools
6685-00-353-570121491 INTERCHANGEABLE
Indicator,temperature,electrical
Koehring Cranes, Inc Dba Terex Cranes Div Waverly Operations
4920-00-610-66492-1491 INTERCHANGEABLE
Meter Assy,flow
Jaidinger Manufacturing Co Inc Dba Jaidinger Manufacturing Co Inc
5950-00-754-64269137141 INTERCHANGEABLE
Transformer,power Autotransforme
Us Army Aviation and Missile Command
5840-01-157-708921491 INTERCHANGEABLE
Spline,steel Antenn
Ward Leonard Ct Llc
4130-01-261-986521491 INTERCHANGEABLE
Slide Gate,ice
Imi Cornelius Inc.
Cross-Reference Index
Part NumberManufacturer
21-491 PRIMARY Eaton Corp Opns & Technical Center (USA)
58D0010-10 William Spencer (USA)
Related Parts
5950-00-093-8321INTERCHANGEABLE
COIL,RADIO FREQUENCY
2149-1
5110-00-189-3378INTERCHANGEABLE
REAMER,HAND
21491
6685-00-353-5701INTERCHANGEABLE
INDICATOR,TEMPERATURE,ELECTRICAL
21491
4920-00-610-6649INTERCHANGEABLE
METER ASSY,FLOW
2-1491
5950-00-754-6426INTERCHANGEABLE
TRANSFORMER,POWER AUTOTRANSFORME
9137141
5840-01-157-7089INTERCHANGEABLE
SPLINE,STEEL ANTENN
21491
4130-01-261-9865INTERCHANGEABLE
SLIDE GATE,ICE
21491

Frequently Asked Questions

What is NSN 5999-00-691-7808?

NSN 5999-00-691-7808 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 5999-00-691-7808?

NSN 5999-00-691-7808 has 2 cross-referenced part numbers: 21-491 (Eaton Corp Opns & Technical Center), 58D0010-10 (William Spencer).

What NSN replaces 5999-00-691-7808?

There are 7 known substitutes for 5999-00-691-7808: 5950-00-093-8321, 5110-00-189-3378, 6685-00-353-5701 and 4 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21-491?

Key specifications for 21-491: Mounting Method: SPRING TENSION; Material: SILVER CONTACT; Mounting Facility Quantity: 1; Precious Material and Weight: 0.005 SILVER GRAINS, TROY. 10 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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