PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

7939Thermostat,flow Control

Therm-O-Disc Incorporated · NSN 6685-00-948-4788 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-948-4788 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-948-4788. Primary manufacturer part number: 7939.
Features
  • Thermostat,flow Control — FSC 6685
  • Spring Operated Pressure Relief: NOT PROVIDED
  • Largest Outside Diameter: 3.000 INCHES NOMINAL IN
  • Mounting Method: THREADED
  • FSC Application Data: VEHICULAR ENGINE INSTRUMENTS
  • Usage Design: EMU-10 AND 11/U
  • Opening Temp Rating: 100.0 FAHRENHEIT NOMINAL DEGF
  • Thermostat Type: BIMETALLIC
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Thermostat,flow Control, cataloged under National Stock Number 6685-00-948-4788, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Therm-O-Disc Incorporated. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-948-4788
Primary Part Number7939
Item NameThermostat,flow Control
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerTherm-O-Disc Incorporated
StatusACTIVE
Spring Operated Pressure ReliefNOT PROVIDED
Largest Outside Diameter3.000 INCHES NOMINAL IN
Mounting MethodTHREADED
FSC Application DataVEHICULAR ENGINE INSTRUMENTS
Usage DesignEMU-10 AND 11/U
Opening Temp Rating100.0 FAHRENHEIT NOMINAL DEGF
Thermostat TypeBIMETALLIC
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
9540-00-251-1790 INTERCHANGEABLE
Angle,structural
Cross-Reference Index
Part NumberManufacturer
7939 PRIMARY Therm-O-Disc Incorporated (USA)
64B42548 Sacramento Air Logistics Center Sm-Alc/liil (USA)
Related Parts
9540-00-251-1790INTERCHANGEABLE
ANGLE,STRUCTURAL

Frequently Asked Questions

What is NSN 6685-00-948-4788?

NSN 6685-00-948-4788 is a Thermostat,flow Control, manufactured by Therm-O-Disc Incorporated, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-948-4788?

NSN 6685-00-948-4788 has 2 cross-referenced part numbers: 7939 (Therm-O-Disc Incorporated), 64B42548 (Sacramento Air Logistics Center Sm-Alc/liil).

What NSN replaces 6685-00-948-4788?

There is 1 known substitute for 6685-00-948-4788: 9540-00-251-1790. Verify interchangeability with system specifications before substitution.

What are the specifications of 7939?

Key specifications for 7939: Spring Operated Pressure Relief: NOT PROVIDED; Largest Outside Diameter: 3.000 INCHES NOMINAL IN; Mounting Method: THREADED; FSC Application Data: VEHICULAR ENGINE INSTRUMENTS. 7 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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