PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

BK566AContact,electrical

United Technologies Corp Electro Systems Inc · NSN 5999-00-642-5478 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-642-5478 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-642-5478. Primary manufacturer part number: BK566A.
Features
  • Contact,electrical — FSC 5999
  • Material: TUNGSTEN CONTACT
  • Terminal Type and Quantity: 1 TAB, SOLDER LUG AXIALLY AT ONE END
  • Distance Between Mounting Facility Centers: 1.875 INCHES NOMINAL IN
  • Point Diameter: 0.188 INCHES NOMINAL IN
  • Mounting Facility Quantity: 2
  • Mounting Method: UNTHREADED HOLE(S)
  • Point Height: 0.125 INCHES NOMINAL IN
Applications
  • Applications requiring Tungsten Contact construction
General Description

The Contact,electrical, cataloged under National Stock Number 5999-00-642-5478, 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 United Technologies Corp Electro Systems Inc. Government technical data includes 14 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 5 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN5999-00-642-5478
Primary Part NumberBK566A
Item NameContact,electrical
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerUnited Technologies Corp Electro Systems Inc
StatusCANCELLED
MaterialTUNGSTEN CONTACT
Terminal Type and Quantity1 TAB, SOLDER LUG AXIALLY AT ONE END
Distance Between Mounting Facility Centers1.875 INCHES NOMINAL IN
Point Diameter0.188 INCHES NOMINAL IN
Mounting Facility Quantity2
Mounting MethodUNTHREADED HOLE(S)
Point Height0.125 INCHES NOMINAL IN
MaterialTUNGSTEN CONTACT
Terminal Type and Quantity1 TAB, SOLDER LUG AXIALLY AT ONE END
Distance Between Mounting Facility Centers1.875 INCHES NOMINAL IN
Point Diameter0.188 INCHES NOMINAL IN
Mounting Facility Quantity2
Mounting MethodUNTHREADED HOLE(S)
Point Height0.125 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 5
Circuit Card Assembly
5930-00-272-12783-6018 INTERCHANGEABLE
Switch,push
Balkamp Inc
4820-00-913-043936018 INTERCHANGEABLE
Valve,check
Eaton Corporation Dba Eaton Inoac Div Eaton
5360-00-937-6797 INTERCHANGEABLE
Spring,leaf
4940-01-608-107636018 INTERCHANGEABLE
Auger,pipe Cleaning,sewer
Emerson Electric Co Ridgid/kollman Div
Cross-Reference Index
Part NumberManufacturer
BK566A PRIMARY United Technologies Corp Electro Systems Inc (USA)
36018 John Deer Consumer Products Inc (USA)
BK566 Ambac International Corporation Div Ambac International (USA)
BK566A Ambac International Corporation Div Ambac International (USA)
BK566 United Technologies Corp Electro Systems Inc (USA)
Related Parts
5998-01-397-8443SUCCESSOR
CIRCUIT CARD ASSEMBLY
5930-00-272-1278INTERCHANGEABLE
SWITCH,PUSH
3-6018
4820-00-913-0439INTERCHANGEABLE
VALVE,CHECK
36018
5360-00-937-6797INTERCHANGEABLE
SPRING,LEAF
4940-01-608-1076INTERCHANGEABLE
AUGER,PIPE CLEANING,SEWER
36018

Frequently Asked Questions

What is NSN 5999-00-642-5478?

NSN 5999-00-642-5478 is a Contact,electrical, manufactured by United Technologies Corp Electro Systems Inc, classified under FSC 5999 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 5999-00-642-5478?

NSN 5999-00-642-5478 has 5 cross-referenced part numbers: BK566A (United Technologies Corp Electro Systems Inc), 36018 (John Deer Consumer Products Inc), BK566 (Ambac International Corporation Div Ambac International), BK566A (Ambac International Corporation Div Ambac International), BK566 (United Technologies Corp Electro Systems Inc).

What NSN replaces 5999-00-642-5478?

There are 5 known substitutes for 5999-00-642-5478: 5998-01-397-8443, 5930-00-272-1278, 4820-00-913-0439 and 2 more. Verify interchangeability with system specifications before substitution.

What are the specifications of BK566A?

Key specifications for BK566A: Material: TUNGSTEN CONTACT; Terminal Type and Quantity: 1 TAB, SOLDER LUG AXIALLY AT ONE END; Overall Length: 2.000 INCHES NOMINAL IN; Distance Between Mounting Facility Centers: 1.875 INCHES NOMINAL IN. 20 total characteristics are documented in the Federal Logistics Information System.

Is NSN 5999-00-642-5478 still in active supply?

NSN 5999-00-642-5478 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.
PartsTable Design LLC · partstable.com