PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

ST81Thermometer,self-Indicating,digi

Raytek Inc · NSN 6685-01-660-0635 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-660-0635 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-660-0635. Primary manufacturer part number: ST81.
Features
  • Thermometer,self-Indicating,digi — FSC 6685
  • Operating Temp Range: -0.9 TO 50.0 CELSIUS DEGC
  • Measurement Type: DIGITAL
  • Switch Type and Quantity: 1 PUSH BUTTON
  • Measurement Range: -32.0 TO 760.0 DEG CELSIUS
  • 1 verified cross-reference
  • Primary manufacturer: Raytek Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Thermometer,self-Indicating,digi, cataloged under National Stock Number 6685-01-660-0635, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Raytek Inc. Government technical data includes 4 verified specifications, 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-01-660-0635
Primary Part NumberST81
Item NameThermometer,self-Indicating,digi
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerRaytek Inc
StatusACTIVE
Operating Temp Range-0.9 TO 50.0 CELSIUS DEGC
Measurement TypeDIGITAL
Switch Type and Quantity1 PUSH BUTTON
Measurement Range-32.0 TO 760.0 DEG CELSIUS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5220-00-072-4458ST81 INTERCHANGEABLE
Gage,plug,plain Cylindrical
Textron Lycoming Inc Williamsport Plant
5945-00-890-243224021 INTERCHANGEABLE
Relay,electromagnetic
Ford Motor Co of Canada Ltd
Cross-Reference Index
Part NumberManufacturer
ST81 PRIMARY Raytek Inc (USA)
Related Parts
5220-00-072-4458INTERCHANGEABLE
GAGE,PLUG,PLAIN CYLINDRICAL
ST81
5945-00-890-2432INTERCHANGEABLE
RELAY,ELECTROMAGNETIC
24021

Frequently Asked Questions

What is NSN 6685-01-660-0635?

NSN 6685-01-660-0635 is a Thermometer,self-Indicating,digi, manufactured by Raytek Inc, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-01-660-0635?

NSN 6685-01-660-0635 has 1 cross-referenced part number: ST81 (Raytek Inc).

What NSN replaces 6685-01-660-0635?

There are 2 known substitutes for 6685-01-660-0635: 5220-00-072-4458, 5945-00-890-2432. Verify interchangeability with system specifications before substitution.

What are the specifications of ST81?

Key specifications for ST81: Operating Temp Range: -0.9 TO 50.0 CELSIUS DEGC; Part Name Assigned by Controlling Agency: PORTABLE INFRARED THERMOMETER; Measurement Type: DIGITAL; Special Features: 2 X AA/LR6 BATTERIES OR USB CONNECTION WHEN USED WITH A PC;99 DATA LOGGING POINTS;LASER GUIDED SIGHTING SYSTEM FOR EASY TARGETING WITH 1 PERCENT ACCURACY. 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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