PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

T001Thermometer,self-Indicating

Sigma Products & Mfg · NSN 6685-00-902-6404 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-902-6404 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-902-6404. Primary manufacturer part number: T001.
Features
  • Thermometer,self-Indicating — FSC 6685
  • Material: GLASS OVERALL
  • Actuating Medium: MERCURYMERCURY
  • Features Provided: LENS MAGNIFYING FRONTLENS MAGNIFYING FRONT
  • Scale Inscription/background Color: BLACK MARKING ON WHITE BACKGROUNDBLACK MARKING ON WHITE BACKGROUND
  • Design Type: FLUCTUATINGFLUCTUATING
  • Style Designator: IMMERSION RING TOP
  • Scale Type: ETCHED STEMETCHED STEM
Applications
  • Applications requiring Glass Overall construction
General Description

The Thermometer,self-Indicating, cataloged under National Stock Number 6685-00-902-6404, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Sigma Products & Mfg. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 5 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6685-00-902-6404
Primary Part NumberT001
Item NameThermometer,self-Indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerSigma Products & Mfg
StatusCANCELLED
MaterialGLASS OVERALL
Actuating MediumMERCURYMERCURY
Features ProvidedLENS MAGNIFYING FRONTLENS MAGNIFYING FRONT
Scale Inscription/background ColorBLACK MARKING ON WHITE BACKGROUNDBLACK MARKING ON WHITE BACKGROUND
Design TypeFLUCTUATINGFLUCTUATING
Style DesignatorIMMERSION RING TOP
Scale TypeETCHED STEMETCHED STEM
Scale Smallest Increment2.0 DEG FAHRENHEIT2.0 DEG FAHRENHEIT
Securing Device TypeCLIPCLIP
Scale Measurement Range-40.000 TO 120.000 DEG FAHRENHEIT-40.000 TO 120.000 DEG FAHRENHEIT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
1040-00-300-423821411 INTERCHANGEABLE
Bus,bar
L3harris Technologies, Inc. Div Space and Airborne Systems
4820-00-342-558521411 INTERCHANGEABLE
Seat,valve
Barksdale, Inc
5330-00-346-4610145196D INTERCHANGEABLE
Gasket
Brinkley Technology Group Llc Dba Hercules Manufacturing
5999-00-364-013121-411 INTERCHANGEABLE
Contact,electrical
Eaton Corp Opns & Technical Center
3820-00-402-82252-1411 INTERCHANGEABLE
Roller,cable
Terex Usa, Llc Dba Terex Equipment Services
5950-00-581-217721-411 INTERCHANGEABLE
Coil,radio Frequency
Neurotech Corp Control Electronics Div
5970-00-616-6337 INTERCHANGEABLE
Insulator,plate
5950-00-794-3971214-11 INTERCHANGEABLE
Coil,radio Frequency
Wilco Corp
5940-00-836-060210-321-1 INTERCHANGEABLE
Terminal,feedthru
Concord Electronics, Inc.
5915-01-046-6531905482-1 INTERCHANGEABLE
Filter,radio Frequency Interfere
Northrop Grumman Systems Corporation Dba Northrop Grumman Systems Corp
Cross-Reference Index
Part NumberManufacturer
5100R Weksler Glass Thermometer Corp (USA)
21411 Tycos Instruments Inc a Welch Allyn Co (USA)
T001 PRIMARY Sigma Products & Mfg (USA)
5100R Ashcroft Inc Dba Heise (USA)
T001 Psg Controls, Inc. (USA)
Related Parts
1040-00-300-4238INTERCHANGEABLE
BUS,BAR
21411
4820-00-342-5585INTERCHANGEABLE
SEAT,VALVE
21411
5330-00-346-4610INTERCHANGEABLE
GASKET
145196D
5999-00-364-0131INTERCHANGEABLE
CONTACT,ELECTRICAL
21-411
3820-00-402-8225INTERCHANGEABLE
ROLLER,CABLE
2-1411
5950-00-581-2177INTERCHANGEABLE
COIL,RADIO FREQUENCY
21-411
5970-00-616-6337INTERCHANGEABLE
INSULATOR,PLATE
5950-00-794-3971INTERCHANGEABLE
COIL,RADIO FREQUENCY
214-11
5940-00-836-0602INTERCHANGEABLE
TERMINAL,FEEDTHRU
10-321-1
5915-01-046-6531INTERCHANGEABLE
FILTER,RADIO FREQUENCY INTERFERE
905482-1
5998-01-072-2465INTERCHANGEABLE
CIRCUIT CARD ASSEMBLY
5210-01-094-6911INTERCHANGEABLE
GAGE,ANGLE
214-1-1

Frequently Asked Questions

What is NSN 6685-00-902-6404?

NSN 6685-00-902-6404 is a Thermometer,self-Indicating, manufactured by Sigma Products & Mfg, classified under FSC 6685 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6685-00-902-6404?

NSN 6685-00-902-6404 has 5 cross-referenced part numbers: 5100R (Weksler Glass Thermometer Corp), 21411 (Tycos Instruments Inc a Welch Allyn Co), T001 (Sigma Products & Mfg), 5100R (Ashcroft Inc Dba Heise), T001 (Psg Controls, Inc.).

What NSN replaces 6685-00-902-6404?

There are 12 known substitutes for 6685-00-902-6404: 1040-00-300-4238, 4820-00-342-5585, 5330-00-346-4610 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of T001?

Key specifications for T001: Overall Length: 5.500 INCHES NOMINAL5.500 INCHES NOMINAL IN; Material: GLASS OVERALL; Actuating Medium: MERCURYMERCURY; Features Provided: LENS MAGNIFYING FRONTLENS MAGNIFYING FRONT. 11 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6685-00-902-6404 still in active supply?

NSN 6685-00-902-6404 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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