PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

M27-400Thermometer,indicating,capillary

Weksler Glass Thermometer Corp · NSN 6685-00-491-8220 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-491-8220 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-491-8220. Primary manufacturer part number: M27-400.
Features
  • Thermometer,indicating,capillary — FSC 6685
  • Bulb Style: PLAIN BULB W/BENDABLE EXTENSIONPLAIN BULB W/BENDABLE EXTENSION
  • Active Portion Length: 1.500 INCHES NOMINAL IN
  • Specification/standard Data: 81349--19646-C124D410 GOVERNMENT SPECIFICATION81349--19646-C124D410 GOVERNMENT SPECIFICATION
  • Nondefinitive Spec/std Data: C CLASSC CLASS
  • Style Designator: BULB W/O SOCKET
  • Material: STEEL CORROSION RESISTING OVERALL
  • Scale Smallest Increment: 2.0 DEG FAHRENHEIT2.0 DEG FAHRENHEIT
Applications
  • Applications requiring Steel Corrosion Resisting Overall construction
General Description

The Thermometer,indicating,capillary, cataloged under National Stock Number 6685-00-491-8220, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Weksler Glass Thermometer Corp. Government technical data includes 25 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 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: Cancelled.

Technical Specifications
ParameterValue
NSN6685-00-491-8220
Primary Part NumberM27-400
Item NameThermometer,indicating,capillary
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerWeksler Glass Thermometer Corp
StatusCANCELLED
Bulb StylePLAIN BULB W/BENDABLE EXTENSIONPLAIN BULB W/BENDABLE EXTENSION
Active Portion Length1.500 INCHES NOMINAL IN
Specification/standard Data81349--19646-C124D410 GOVERNMENT SPECIFICATION81349--19646-C124D410 GOVERNMENT SPECIFICATION
Nondefinitive Spec/std DataC CLASSC CLASS
Style DesignatorBULB W/O SOCKET
MaterialSTEEL CORROSION RESISTING OVERALL
Scale Smallest Increment2.0 DEG FAHRENHEIT2.0 DEG FAHRENHEIT
Actuating MediumGAS
Bulb Overall Length2.125 INCHES NOMINAL2.125 INCHES NOMINAL IN
Scale Measurement Range+20.000 TO 240.000 DEG FAHRENHEIT+20.000 TO 240.000 DEG FAHRENHEIT
Active Portion Diameter0.370 INCHES MINIMUM AND 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM0.375 INCHES MAXIMUM IN
Bulb Quantity11
Dial Diameter4.500 INCHES NOMINAL4.500 INCHES NOMINAL IN
Bulb Tip Length1.500 INCHES NOMINAL1.500 INCHES NOMINAL IN
Scale TypeCONCENTRIC
Flexible Tube Length120.000 INCHES NOMINAL120.000 INCHES NOMINAL IN
Pointer/pen Type and Quantity1 INDICATING SINGLE
Case TypeSHOCK PROOF
Bulb Connection TypeUNIONUNION
Indicator Connection MethodFLEXIBLE TUBE
Bulb TypePLAIN RIGIDPLAIN RIGID
Case Diameter5.875 INCHES NOMINAL5.875 INCHES NOMINAL IN
Scale Inscription/background ColorBLACK MARKINGS ON YELLOW BACKGROUNDBLACK MARKINGS ON YELLOW BACKGROUND
Extension Neck Length0.625 INCHES NOMINAL IN
Features ProvidedZERO ADJUSTMENT
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
6685-00-007-959381GNN00RW75Y INTERCHANGEABLE
Thermometer,indicating,capillary
Ashcroft Inc Dba Heise
6685-00-147-584181GN-N00U-W40Y INTERCHANGEABLE
Thermometer,indicating,capillary
Ashcroft Inc Dba Heise
6685-00-428-878981GK-Y00R-W25Y INTERCHANGEABLE
Thermometer,indicating,capillary
Weksler Glass Thermometer Corp
6685-00-469-8891 INTERCHANGEABLE
Thermometer,indicating,capillary
6685-00-475-223681GN-P00U-W45Y INTERCHANGEABLE
Thermometer,indicating,capillary
Ashcroft Inc Dba Heise
6685-00-477-2169 INTERCHANGEABLE
Thermometer,indicating,capillary
6685-00-491-816641GHV00LA80Y INTERCHANGEABLE
Thermometer,indicating,capillary
Ashcroft Inc Dba Heise
6685-00-491-821741GN-P00R-R65Y INTERCHANGEABLE
Thermometer,indicating,capillary
Ashcroft Inc Dba Heise
6685-01-262-0036 INTERCHANGEABLE
Thermometer,self-Indicating,gas
6685-01-262-0045 INTERCHANGEABLE
Thermometer,self-Indicating,bime
Cross-Reference Index
Part NumberManufacturer
M27-400 Weksler Glass Thermometer Corp (USA)
41GP-Y00L-F10Y Weksler Glass Thermometer Corp (USA)
MIL-T-19646 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
M19646-C124D410 Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M
Related Parts
6685-00-007-9593INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
81GNN00RW75Y
6685-00-147-5841INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
81GN-N00U-W40Y
6685-00-428-8789INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
81GK-Y00R-W25Y
6685-00-469-8891INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
6685-00-475-2236INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
81GN-P00U-W45Y
6685-00-477-2169INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
6685-00-491-8166INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
41GHV00LA80Y
6685-00-491-8217INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
41GN-P00R-R65Y
6685-01-262-0036INTERCHANGEABLE
THERMOMETER,SELF-INDICATING,GAS
6685-01-262-0045INTERCHANGEABLE
THERMOMETER,SELF-INDICATING,BIME
6685-01-357-9082INTERCHANGEABLE
THERMOMETER,INDICATING,CAPILLARY
41GH-V00R-A70W
6685-01-374-0348INTERCHANGEABLE
THERMOMETER,SELF-INDICATING
41GPY00R050Y

Frequently Asked Questions

What is NSN 6685-00-491-8220?

NSN 6685-00-491-8220 is a Thermometer,indicating,capillary, manufactured by Weksler Glass Thermometer Corp, classified under FSC 6685 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6685-00-491-8220?

NSN 6685-00-491-8220 has 4 cross-referenced part numbers: M27-400 (Weksler Glass Thermometer Corp), 41GP-Y00L-F10Y (Weksler Glass Thermometer Corp), MIL-T-19646 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M), M19646-C124D410 (Military Specifications Promulgated by Military Departments/agencies Under Authority of Defense Standardization Manual 4120 3-M).

What NSN replaces 6685-00-491-8220?

There are 12 known substitutes for 6685-00-491-8220: 6685-00-007-9593, 6685-00-147-5841, 6685-00-428-8789 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of M27-400?

Key specifications for M27-400: Bulb Style: PLAIN BULB W/BENDABLE EXTENSIONPLAIN BULB W/BENDABLE EXTENSION; Active Portion Length: 1.500 INCHES NOMINAL IN; Specification/standard Data: 81349--19646-C124D410 GOVERNMENT SPECIFICATION81349--19646-C124D410 GOVERNMENT SPECIFICATION; Nondefinitive Spec/std Data: C CLASSC CLASS. 26 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6685-00-491-8220 still in active supply?

NSN 6685-00-491-8220 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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