PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

2050W-BTThermometer,self-Indicating

Kessler Thermometer Corp Dba Kessler Thermometers Corp · NSN 6685-00-851-4577 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-851-4577 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-851-4577. Primary manufacturer part number: 2050W-BT.
Features
  • Thermometer,self-Indicating — FSC 6685
  • Scale Accuracy Rating: 1/2 TO 1 PCT OF RANGE OF SCALE1/2 TO 1 PCT OF RANGE OF SCALE
  • Scale Type: ENGRAVED STEMENGRAVED STEM
  • Scale Smallest Increment: 1.0 DEG FAHRENHEIT1.0 DEG FAHRENHEIT
  • Scale Length: 229.0 MILLIMETERS NOMINAL229.0 MILLIMETERS NOMINAL MM
  • Immersion Length: 76.0 MILLIMETERS NOMINAL76.0 MILLIMETERS NOMINAL MM
  • Scale Inscription/background Color: BLACK MARKING ON WHITE BACKGROUNDBLACK MARKING ON WHITE BACKGROUND
  • Style Designator: IMMERSION RING TOP
Applications
  • Applications requiring Glass Stem Liquid in Glass construction
General Description

The Thermometer,self-Indicating, cataloged under National Stock Number 6685-00-851-4577, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Kessler Thermometer Corp Dba Kessler Thermometers Corp. Government technical data includes 12 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 9 commercial cross-references from 8 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
NSN6685-00-851-4577
Primary Part Number2050W-BT
Item NameThermometer,self-Indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerKessler Thermometer Corp Dba Kessler Thermometers Corp
StatusCANCELLED
Scale Accuracy Rating1/2 TO 1 PCT OF RANGE OF SCALE1/2 TO 1 PCT OF RANGE OF SCALE
Scale TypeENGRAVED STEMENGRAVED STEM
Scale Smallest Increment1.0 DEG FAHRENHEIT1.0 DEG FAHRENHEIT
Scale Length229.0 MILLIMETERS NOMINAL229.0 MILLIMETERS NOMINAL MM
Immersion Length76.0 MILLIMETERS NOMINAL76.0 MILLIMETERS NOMINAL MM
Scale Inscription/background ColorBLACK MARKING ON WHITE BACKGROUNDBLACK MARKING ON WHITE BACKGROUND
Style DesignatorIMMERSION RING TOP
Design TypeFLUCTUATINGFLUCTUATING
MaterialGLASS STEM LIQUID IN GLASS
Actuating MediumMERCURYMERCURY
Scale Measurement Range-20.000 TO 110.000 DEG CELSIUS-20.000 TO 110.000 DEG CELSIUS
Securing Device TypeRINGRING
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 12
2530-00-003-0089WC59241 INTERCHANGEABLE
Cylinder Assembly,hydraulic Brak
Federal Mogul Corp Sub Wagner Brake Moog Automotive Div
5120-00-023-839921302 INTERCHANGEABLE
Clamp,c
Wilton Corp Wilton Tool Div
5310-00-032-18143231 INTERCHANGEABLE
Washer,lock
Prestolite Electric Inc
5330-00-154-836324226 INTERCHANGEABLE
Seal,plain Encased
Dressta North America Ltd
4510-00-237-3667 INTERCHANGEABLE
Seat,faucet
4820-00-249-420313211E7842 INTERCHANGEABLE
Valve,angle
Cecom Lr Center
4030-00-274-5175 INTERCHANGEABLE
Thimble,rope
5330-00-290-032410253LPD INTERCHANGEABLE
Seal,plain Encased
Parker-Hannifin Corporation Dba Pneutronics Div Engineered Polymer Systems
5331-00-298-619754A50C116-3 INTERCHANGEABLE
O-Ring
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
3040-00-364-6834005903 INTERCHANGEABLE
Shaft,straight
Caterpillar Inc Div Caterpillar Defense
Cross-Reference Index
Part NumberManufacturer
50S0B Psg Controls, Inc. (USA)
21302 Tycos Instruments Inc a Welch Allyn Co (USA)
14-985B Fisher Scientific Company L.l.c. (USA)
14-985B Fisher Scientific Co (USA)
2050W-BT PRIMARY Kessler Thermometer Corp Dba Kessler Thermometers Corp (USA)
14-985B Fisher Scientific Worldwide (USA)
13202459 Fisher Scientific Company L.l.c. (USA)
5903 H O Trerice Co (USA)
3231 Weksler Glass Thermometer Corp (USA)
Related Parts
2530-00-003-0089INTERCHANGEABLE
CYLINDER ASSEMBLY,HYDRAULIC BRAK
WC59241
5120-00-023-8399INTERCHANGEABLE
CLAMP,C
21302
5310-00-032-1814INTERCHANGEABLE
WASHER,LOCK
3231
5330-00-154-8363INTERCHANGEABLE
SEAL,PLAIN ENCASED
24226
4510-00-237-3667INTERCHANGEABLE
SEAT,FAUCET
4820-00-249-4203INTERCHANGEABLE
VALVE,ANGLE
13211E7842
4030-00-274-5175INTERCHANGEABLE
THIMBLE,ROPE
5330-00-290-0324INTERCHANGEABLE
SEAL,PLAIN ENCASED
10253LPD
5331-00-298-6197INTERCHANGEABLE
O-RING
54A50C116-3
3040-00-364-6834INTERCHANGEABLE
SHAFT,STRAIGHT
005903
2530-00-450-9292INTERCHANGEABLE
KINGPIN SET
5330-00-496-0066INTERCHANGEABLE
GASKET
75G13517-100

Frequently Asked Questions

What is NSN 6685-00-851-4577?

NSN 6685-00-851-4577 is a Thermometer,self-Indicating, manufactured by Kessler Thermometer Corp Dba Kessler Thermometers Corp, classified under FSC 6685 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6685-00-851-4577?

NSN 6685-00-851-4577 has 9 cross-referenced part numbers: 50S0B (Psg Controls, Inc.), 21302 (Tycos Instruments Inc a Welch Allyn Co), 14-985B (Fisher Scientific Company L.l.c.), 14-985B (Fisher Scientific Co), 2050W-BT (Kessler Thermometer Corp Dba Kessler Thermometers Corp) and 4 more.

What NSN replaces 6685-00-851-4577?

There are 12 known substitutes for 6685-00-851-4577: 2530-00-003-0089, 5120-00-023-8399, 5310-00-032-1814 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 2050W-BT?

Key specifications for 2050W-BT: Scale Accuracy Rating: 1/2 TO 1 PCT OF RANGE OF SCALE1/2 TO 1 PCT OF RANGE OF SCALE; Scale Type: ENGRAVED STEMENGRAVED STEM; Scale Smallest Increment: 1.0 DEG FAHRENHEIT1.0 DEG FAHRENHEIT; Scale Length: 229.0 MILLIMETERS NOMINAL229.0 MILLIMETERS NOMINAL MM. 13 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6685-00-851-4577 still in active supply?

NSN 6685-00-851-4577 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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