PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

K21Thermocouple,contact

Pyrometer Instrument Co Inc · NSN 6685-01-045-8510 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-045-8510 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-045-8510. Primary manufacturer part number: K21.
Features
  • Thermocouple,contact — FSC 6685
  • Unit Type: BUTTON
  • Terminal Type and Quantity: 1 CONNECTOR
  • 1 verified cross-reference
  • Primary manufacturer: Pyrometer Instrument Co Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Thermocouple,contact, cataloged under National Stock Number 6685-01-045-8510, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Pyrometer Instrument Co Inc. Government technical data includes 2 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. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-01-045-8510
Primary Part NumberK21
Item NameThermocouple,contact
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerPyrometer Instrument Co Inc
StatusACTIVE
Unit TypeBUTTON
Terminal Type and Quantity1 CONNECTOR
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
3040-00-217-5294K2-1 INTERCHANGEABLE
Hub,body
Roller Bearing Co of America, Inc Div Pic Design
3110-00-616-7554400021 INTERCHANGEABLE
Cup,ball Bearing
Zf Active Safety and Electronics Us Llc Div Trw Commercial Steering Systems
5430-00-922-2406016825-2 INTERCHANGEABLE
Tank,liquid Storage
Sea Cure Technology, Inc
4310-01-021-6649K21 INTERCHANGEABLE
Connecting Rod,piston
Emglo Products Corp
5120-01-243-9273K-21 INTERCHANGEABLE
Knife,putty
Ampco Partners, Ltd. Dba Ampco Safety Tools
3460-01-339-7309K-21 INTERCHANGEABLE
Wheel,abrasive
Sioux Tools Inc
Cross-Reference Index
Part NumberManufacturer
K21 Pyrometer Instrument Co Inc (USA)
Related Parts
3040-00-217-5294INTERCHANGEABLE
HUB,BODY
K2-1
3110-00-616-7554INTERCHANGEABLE
CUP,BALL BEARING
400021
5430-00-922-2406INTERCHANGEABLE
TANK,LIQUID STORAGE
016825-2
4310-01-021-6649INTERCHANGEABLE
CONNECTING ROD,PISTON
K21
5120-01-243-9273INTERCHANGEABLE
KNIFE,PUTTY
K-21
3460-01-339-7309INTERCHANGEABLE
WHEEL,ABRASIVE
K-21

Frequently Asked Questions

What is NSN 6685-01-045-8510?

NSN 6685-01-045-8510 is a Thermocouple,contact, manufactured by Pyrometer Instrument Co Inc, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-01-045-8510?

NSN 6685-01-045-8510 has 1 cross-referenced part number: K21 (Pyrometer Instrument Co Inc).

What NSN replaces 6685-01-045-8510?

There are 6 known substitutes for 6685-01-045-8510: 3040-00-217-5294, 3110-00-616-7554, 5430-00-922-2406 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of K21?

Key specifications for K21: Unit Type: BUTTON; Terminal Type and Quantity: 1 CONNECTOR; Overall Length: 12.000 INCHES NOMINAL IN. 3 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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