PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

W18Heater,thermal Release

Ward Leonard Ct Llc · NSN 5999-00-499-7441 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-499-7441 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-499-7441. Primary manufacturer part number: W18.
Features
  • Heater,thermal Release — FSC 5999
  • Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S)
  • Mounting Hole Diameter: 0.188 INCHES NOMINAL IN
  • Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S)
  • Mounting Hole Diameter: 0.188 INCHES NOMINAL IN
  • 1 verified cross-reference
  • Primary manufacturer: Ward Leonard Ct Llc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heater,thermal Release, cataloged under National Stock Number 5999-00-499-7441, 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 Ward Leonard Ct Llc. Government technical data includes 4 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-00-499-7441
Primary Part NumberW18
Item NameHeater,thermal Release
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerWard Leonard Ct Llc
StatusACTIVE
Mounting Facility Type and Quantity2 UNTHREADED HOLE(S)
Mounting Hole Diameter0.188 INCHES NOMINAL IN
Mounting Facility Type and Quantity2 UNTHREADED HOLE(S)
Mounting Hole Diameter0.188 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeN
Unit of IssueEA
SMR CodeZN
Weight0.1000 lbs
Cube0.0239 cu ft
Verified Substitutes 4
5310-00-186-0977 INTERCHANGEABLE
Washer,key
3426-00-243-3169 INTERCHANGEABLE
Tank,hot Dip,directly Heated
2920-00-294-38963076 INTERCHANGEABLE
Spark Plug
Allied-Signal Inc Autolite Div
4310-01-299-0493W18 INTERCHANGEABLE
Breather
Emglo Products Corp
Cross-Reference Index
Part NumberManufacturer
W18 PRIMARY Ward Leonard Ct Llc (USA)
Related Parts
5310-00-186-0977INTERCHANGEABLE
WASHER,KEY
3426-00-243-3169INTERCHANGEABLE
TANK,HOT DIP,DIRECTLY HEATED
2920-00-294-3896INTERCHANGEABLE
SPARK PLUG
3076
4310-01-299-0493INTERCHANGEABLE
BREATHER
W18

Frequently Asked Questions

What is NSN 5999-00-499-7441?

NSN 5999-00-499-7441 is a Heater,thermal Release, manufactured by Ward Leonard Ct Llc, classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-00-499-7441?

NSN 5999-00-499-7441 has 1 cross-referenced part number: W18 (Ward Leonard Ct Llc).

What NSN replaces 5999-00-499-7441?

There are 4 known substitutes for 5999-00-499-7441: 5310-00-186-0977, 3426-00-243-3169, 2920-00-294-3896 and 1 more. Verify interchangeability with system specifications before substitution.

What are the specifications of W18?

Key specifications for W18: Mounting Facility Type and Quantity: 2 UNTHREADED HOLE(S); Overall Length: 1.937 INCHES NOMINAL IN; Overall Width: 0.625 INCHES NOMINAL IN; Overall Height: 0.750 INCHES NOMINAL IN. 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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