PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

27700-3Thermocouple,immersion

Rdf Corporation · NSN 6685-01-152-4156 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-152-4156 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-152-4156. Primary manufacturer part number: 27700-3.
Features
  • Thermocouple,immersion — FSC 6685
  • Accommodated Wire Awg Size: 18
  • Operating Temp Range: -40.0 TO 1500.0 FAHRENHEIT DEGF
  • Terminal Type and Quantity: 2 LUG
  • Unit Type: PROTECTIVE TUBE
  • Material: MAGNESIUM ALLOY INDIVIDUAL WIRE INSULATION
  • Mounting Thread Quantity: 28 PER INCH
  • Mounting Facility Nominal Screw Thread Diameter: 0.750 INCHES IN
Applications
  • Applications requiring Magnesium Alloy Individual Wire Insulation construction
General Description

The Thermocouple,immersion, cataloged under National Stock Number 6685-01-152-4156, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Rdf Corporation. Government technical data includes 8 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-01-152-4156
Primary Part Number27700-3
Item NameThermocouple,immersion
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerRdf Corporation
StatusACTIVE
Accommodated Wire Awg Size18
Operating Temp Range-40.0 TO 1500.0 FAHRENHEIT DEGF
Terminal Type and Quantity2 LUG
Unit TypePROTECTIVE TUBE
MaterialMAGNESIUM ALLOY INDIVIDUAL WIRE INSULATION
Mounting Thread Quantity28 PER INCH
Mounting Facility Nominal Screw Thread Diameter0.750 INCHES IN
Immersion Length2.690 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
6685-00-574-8877 INTERCHANGEABLE
Thermocouple Assembly
5920-01-020-7324277003 INTERCHANGEABLE
Fuse,special
Littelfuse, Inc.
5998-01-039-2476 INTERCHANGEABLE
Printed Wiring Board
6685-01-064-5525 INTERCHANGEABLE
Thermocouple Assembly
6685-01-077-5259 INTERCHANGEABLE
Sensor,ambient Temperature
6685-01-119-5560 INTERCHANGEABLE
Transmitter,temperature,electric
6685-01-148-9914 INTERCHANGEABLE
Pyrometer,recording
6685-01-212-8046 INTERCHANGEABLE
Thermocouple Assembly
6685-01-336-5072 INTERCHANGEABLE
Thermocouple,heating Element
6685-01-354-4433 INTERCHANGEABLE
Thermocouple,immersion
Cross-Reference Index
Part NumberManufacturer
27700-3 Rdf Corporation (USA)
MIL-T-24388 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
TCEK-9-2TW Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
KTC-TW-II Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
640025-3 Rdf Corporation (USA)
Related Parts
6685-00-574-8877INTERCHANGEABLE
THERMOCOUPLE ASSEMBLY
5920-01-020-7324INTERCHANGEABLE
FUSE,SPECIAL
277003
5998-01-039-2476INTERCHANGEABLE
PRINTED WIRING BOARD
6685-01-064-5525INTERCHANGEABLE
THERMOCOUPLE ASSEMBLY
6685-01-077-5259INTERCHANGEABLE
SENSOR,AMBIENT TEMPERATURE
6685-01-119-5560INTERCHANGEABLE
TRANSMITTER,TEMPERATURE,ELECTRIC
6685-01-148-9914INTERCHANGEABLE
PYROMETER,RECORDING
6685-01-212-8046INTERCHANGEABLE
THERMOCOUPLE ASSEMBLY
6685-01-336-5072INTERCHANGEABLE
THERMOCOUPLE,HEATING ELEMENT
6685-01-354-4433INTERCHANGEABLE
THERMOCOUPLE,IMMERSION
6685-01-368-7059INTERCHANGEABLE
THERMOCOUPLE,IMMERSION
6685-01-393-9024INTERCHANGEABLE
THERMOCOUPLE,IMMERSION

Frequently Asked Questions

What is NSN 6685-01-152-4156?

NSN 6685-01-152-4156 is a Thermocouple,immersion, manufactured by Rdf Corporation, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-01-152-4156?

NSN 6685-01-152-4156 has 5 cross-referenced part numbers: 27700-3 (Rdf Corporation), MIL-T-24388 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), TCEK-9-2TW (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), KTC-TW-II (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), 640025-3 (Rdf Corporation).

What NSN replaces 6685-01-152-4156?

There are 12 known substitutes for 6685-01-152-4156: 6685-00-574-8877, 5920-01-020-7324, 5998-01-039-2476 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 27700-3?

Key specifications for 27700-3: Accommodated Wire Awg Size: 18; Operating Temp Range: -40.0 TO 1500.0 FAHRENHEIT DEGF; Terminal Type and Quantity: 2 LUG; Unit Type: PROTECTIVE TUBE. 10 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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