PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

W56Heater,thermal Release

Ward Leonard Ct Llc · NSN 5999-00-787-6729 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-787-6729 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-787-6729. Primary manufacturer part number: W56.
Features
  • Heater,thermal Release — FSC 5999
  • Mounting Facility Type and Quantity: 1 UNTHREADED HOLE(S)
  • Mounting Facility Type and Quantity: 1 UNTHREADED HOLE(S)
  • 2 verified cross-references
  • 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 5999-00-787-6729, 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 2 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, 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
NSN5999-00-787-6729
Primary Part NumberW56
Item NameHeater,thermal Release
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerWard Leonard Ct Llc
StatusACTIVE
Mounting Facility Type and Quantity1 UNTHREADED HOLE(S)
Mounting Facility Type and Quantity1 UNTHREADED HOLE(S)
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeN
Unit of IssueEA
SMR CodeY
Verified Substitutes 12
5330-00-117-9284 INTERCHANGEABLE
Seal,plain Encased
4520-00-308-0584 INTERCHANGEABLE
Heating Element,electrical,nonim
6645-00-445-814321-2-42021 INTERCHANGEABLE
Fusee
Hamilton Watch Co Inc
4710-00-710-9223157D1-1357 INTERCHANGEABLE
Tube Assembly,metal
Kurz & Root Generator Company, Llc
5940-00-827-428442021 INTERCHANGEABLE
Terminal,quick Disconnect
Te Connectivity Corporation
4330-00-900-889842021 INTERCHANGEABLE
Filter,fluid
Allianz Sweeper Company
5930-00-950-5543951 INTERCHANGEABLE
Switch,push
Switchcraft Inc.
6210-01-007-365251-0901-0111-201 INTERCHANGEABLE
Light,indicator
Dialight Corporation
5315-01-030-599242021 INTERCHANGEABLE
Pin,jib Extension
Stothert & Pitt
4820-01-049-75664202-1 INTERCHANGEABLE
Valve Assembly
Zuricher Beuteltuchfabrik Ag
Cross-Reference Index
Part NumberManufacturer
W56 PRIMARY Ward Leonard Ct Llc (USA)
42021 Ward Leonard Ct Llc (USA)
Related Parts
5330-00-117-9284INTERCHANGEABLE
SEAL,PLAIN ENCASED
4520-00-308-0584INTERCHANGEABLE
HEATING ELEMENT,ELECTRICAL,NONIM
6645-00-445-8143INTERCHANGEABLE
FUSEE
21-2-42021
4710-00-710-9223INTERCHANGEABLE
TUBE ASSEMBLY,METAL
157D1-1357
5940-00-827-4284INTERCHANGEABLE
TERMINAL,QUICK DISCONNECT
42021
4330-00-900-8898INTERCHANGEABLE
FILTER,FLUID
42021
5930-00-950-5543INTERCHANGEABLE
SWITCH,PUSH
951
6210-01-007-3652INTERCHANGEABLE
LIGHT,INDICATOR
51-0901-0111-201
5315-01-030-5992INTERCHANGEABLE
PIN,JIB EXTENSION
42021
4820-01-049-7566INTERCHANGEABLE
VALVE ASSEMBLY
4202-1
5999-01-281-8366INTERCHANGEABLE
HEATER,THERMAL RELEASE
W56
6515-01-417-7555INTERCHANGEABLE
BONE PLATE
420.21

Frequently Asked Questions

What is NSN 5999-00-787-6729?

NSN 5999-00-787-6729 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 5999-00-787-6729?

NSN 5999-00-787-6729 has 2 cross-referenced part numbers: W56 (Ward Leonard Ct Llc), 42021 (Ward Leonard Ct Llc).

What NSN replaces 5999-00-787-6729?

There are 12 known substitutes for 5999-00-787-6729: 5330-00-117-9284, 4520-00-308-0584, 6645-00-445-8143 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of W56?

Key specifications for W56: Overall Length: 0.937 INCHES NOMINAL IN; Overall Height: 0.375 INCHES NOMINAL IN; Mounting Facility Type and Quantity: 1 UNTHREADED HOLE(S); Overall Length: 0.937 INCHES NOMINAL IN. 6 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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