PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21-939Guard,thermostat

Robertshaw Controls Co Tennessee Div · NSN 6685-01-339-7696 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-339-7696 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-339-7696. Primary manufacturer part number: 21-939.
Features
  • Guard,thermostat — FSC 6685
  • General Characteristics Item Description: THERMOSTAT COVER,DIAL MARKINGS,55 TO 85 DEGREES F,SATIN CHROME METAL
  • 1 verified cross-reference
  • Primary manufacturer: Robertshaw Controls Co Tennessee Div
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Guard,thermostat, cataloged under National Stock Number 6685-01-339-7696, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Robertshaw Controls Co Tennessee Div. Government technical data includes 1 verified specification, 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. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-01-339-7696
Primary Part Number21-939
Item NameGuard,thermostat
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerRobertshaw Controls Co Tennessee Div
StatusACTIVE
General Characteristics Item DescriptionTHERMOSTAT COVER,DIAL MARKINGS,55 TO 85 DEGREES F,SATIN CHROME METAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
1680-00-402-2546PM21939 INTERCHANGEABLE
Trigger,control
Mason Electric Co. Dba Mason Controls
9540-00-684-6322 INTERCHANGEABLE
Beam,structural
9540-01-071-1354 INTERCHANGEABLE
Beam,structural
9540-01-071-2149 INTERCHANGEABLE
Beam,structural
2815-01-288-3732027-06354 INTERCHANGEABLE
Engine Block,diesel
Mark Industries
6625-01-512-378721939 INTERCHANGEABLE
Sensor,current
Ohio Semitronics Inc
Cross-Reference Index
Part NumberManufacturer
21-939 Robertshaw Controls Co Tennessee Div (USA)
Related Parts
1680-00-402-2546INTERCHANGEABLE
TRIGGER,CONTROL
PM21939
9540-00-684-6322INTERCHANGEABLE
BEAM,STRUCTURAL
9540-01-071-1354INTERCHANGEABLE
BEAM,STRUCTURAL
9540-01-071-2149INTERCHANGEABLE
BEAM,STRUCTURAL
2815-01-288-3732INTERCHANGEABLE
ENGINE BLOCK,DIESEL
027-06354
6625-01-512-3787INTERCHANGEABLE
SENSOR,CURRENT
21939

Frequently Asked Questions

What is NSN 6685-01-339-7696?

NSN 6685-01-339-7696 is a Guard,thermostat, manufactured by Robertshaw Controls Co Tennessee Div, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-01-339-7696?

NSN 6685-01-339-7696 has 1 cross-referenced part number: 21-939 (Robertshaw Controls Co Tennessee Div).

What NSN replaces 6685-01-339-7696?

There are 6 known substitutes for 6685-01-339-7696: 1680-00-402-2546, 9540-00-684-6322, 9540-01-071-1354 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21-939?

Key specifications for 21-939: General Characteristics Item Description: THERMOSTAT COVER,DIAL MARKINGS,55 TO 85 DEGREES F,SATIN CHROME METAL. 1 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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