PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

A6.99Heater,thermal Release

Schneider Electric Usa, Inc. · NSN 5999-00-138-0999 · FSC 5999 · No Item Name Available
Verified by PartsTable
NSN 5999-00-138-0999 — this item is cataloged by the U.S. Government under National Stock Number 5999-00-138-0999. Primary manufacturer part number: A6.99.
Features
  • Heater,thermal Release — FSC 5999
  • 2 verified cross-references
  • Primary manufacturer: Schneider Electric Usa, Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heater,thermal Release, cataloged under National Stock Number 5999-00-138-0999, 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 Schneider Electric Usa, Inc.. This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN5999-00-138-0999
Primary Part NumberA6.99
Item NameHeater,thermal Release
FSC / FSG5999 / 59 — No Item Name Available
ManufacturerSchneider Electric Usa, Inc.
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeN
Unit of IssueEA
SMR CodeJN
Weight0.0300 lbs
Cube0.0002 cu ft
Verified Substitutes 6
6810-00-106-1005 INTERCHANGEABLE
Ammonium Hydroxide
5955-00-236-6038 INTERCHANGEABLE
Crystal Unit,quartz
2815-00-362-17469167Y INTERCHANGEABLE
Valve,poppet,engine
Cummins Inc.
5930-00-946-4471168603-1 INTERCHANGEABLE
Switch,thermostatic
Raytheon Company
4320-01-113-5558A699 INTERCHANGEABLE
Impeller,pump,centrifugal
Circor Naval Solutions Llc Dba Warren Pumps
1240-01-721-6867A699 INTERCHANGEABLE
Mount,sight
Lightforce Usa, Incorporated Div Mil-Gov-Le
Cross-Reference Index
Part NumberManufacturer
A6-99 Schneider Electric Usa, Inc. (USA)
A6.99 PRIMARY Schneider Electric Usa, Inc. (USA)
Related Parts
6810-00-106-1005INTERCHANGEABLE
AMMONIUM HYDROXIDE
5955-00-236-6038INTERCHANGEABLE
CRYSTAL UNIT,QUARTZ
2815-00-362-1746INTERCHANGEABLE
VALVE,POPPET,ENGINE
9167Y
5930-00-946-4471INTERCHANGEABLE
SWITCH,THERMOSTATIC
168603-1
4320-01-113-5558INTERCHANGEABLE
IMPELLER,PUMP,CENTRIFUGAL
A699
1240-01-721-6867INTERCHANGEABLE
MOUNT,SIGHT
A699

Frequently Asked Questions

What is NSN 5999-00-138-0999?

NSN 5999-00-138-0999 is a Heater,thermal Release, manufactured by Schneider Electric Usa, Inc., classified under FSC 5999 (No Item Name Available). Status: active.

What are the part numbers for NSN 5999-00-138-0999?

NSN 5999-00-138-0999 has 2 cross-referenced part numbers: A6-99 (Schneider Electric Usa, Inc.), A6.99 (Schneider Electric Usa, Inc.).

What NSN replaces 5999-00-138-0999?

There are 6 known substitutes for 5999-00-138-0999: 6810-00-106-1005, 5955-00-236-6038, 2815-00-362-1746 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of A6.99?

Key specifications for A6.99: Overall Height: 0.844 INCHES NOMINAL IN; Overall Width: 0.375 INCHES NOMINAL IN; Overall Length: 1.375 INCHES NOMINAL IN; Overall Height: 0.844 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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