PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21421Thermometer,self-Indicating

Tycos Instruments Inc a Welch Allyn Co · NSN 6685-00-527-7436 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-527-7436 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-527-7436. Primary manufacturer part number: 21421.
Features
  • Thermometer,self-Indicating — FSC 6685
  • Material: NICKEL METER CASE
  • Style Designator: IMMERSION RING TOP
  • Scale Measurement Range: +0.000 TO 220.000 DEG FAHRENHEIT+0.000 TO 220.000 DEG FAHRENHEIT
  • Scale Type: ETCHED STEMETCHED STEM
  • Features Provided: LENS MAGNIFYING FRONTLENS MAGNIFYING FRONT
  • Securing Device Type: CLIPCLIP
  • Scale Smallest Increment: 2.0 DEG FAHRENHEIT2.0 DEG FAHRENHEIT
Applications
  • Applications requiring Nickel Meter Case construction
General Description

The Thermometer,self-Indicating, cataloged under National Stock Number 6685-00-527-7436, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Tycos Instruments Inc a Welch Allyn Co. Government technical data includes 10 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. 8 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-527-7436
Primary Part Number21421
Item NameThermometer,self-Indicating
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerTycos Instruments Inc a Welch Allyn Co
StatusACTIVE
MaterialNICKEL METER CASE
Style DesignatorIMMERSION RING TOP
Scale Measurement Range+0.000 TO 220.000 DEG FAHRENHEIT+0.000 TO 220.000 DEG FAHRENHEIT
Scale TypeETCHED STEMETCHED STEM
Features ProvidedLENS MAGNIFYING FRONTLENS MAGNIFYING FRONT
Securing Device TypeCLIPCLIP
Scale Smallest Increment2.0 DEG FAHRENHEIT2.0 DEG FAHRENHEIT
Design TypeFLUCTUATINGFLUCTUATING
Nondefinitive Spec/std Data1 TYPE
Actuating MediumLIQUIDLIQUID
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 8
5310-00-033-310121-421 INTERCHANGEABLE
Washer,spring Tension
Horizon Aerospace Llc Dba Magnetics Division
3110-00-100-4221 INTERCHANGEABLE
Bearing,roller,tapered
5935-00-118-78632142-1 INTERCHANGEABLE
Jack,tip
Fluke Electronics Corp
5331-00-467-3347154026 INTERCHANGEABLE
O-Ring
Eaton Aerospace, Llc Dba Jackson South
3120-00-554-268421421 INTERCHANGEABLE
Bearing,sleeve
Master Machine Products Corp
5950-00-815-84402142-1 INTERCHANGEABLE
Coil,radio Frequency
American Trans-Coil Corp
1560-00-869-411821421 INTERCHANGEABLE
Filter Element
Pall Aeropower Corp Sub of Pall Corp Mectron Industries Div
5950-01-381-949121421 INTERCHANGEABLE
Transformer,power
Robert M. Hadley Company, Inc.
Cross-Reference Index
Part NumberManufacturer
21421 Tycos Instruments Inc a Welch Allyn Co (USA)
Related Parts
5310-00-033-3101INTERCHANGEABLE
WASHER,SPRING TENSION
21-421
3110-00-100-4221INTERCHANGEABLE
BEARING,ROLLER,TAPERED
5935-00-118-7863INTERCHANGEABLE
JACK,TIP
2142-1
5331-00-467-3347INTERCHANGEABLE
O-RING
154026
3120-00-554-2684INTERCHANGEABLE
BEARING,SLEEVE
21421
5950-00-815-8440INTERCHANGEABLE
COIL,RADIO FREQUENCY
2142-1
1560-00-869-4118INTERCHANGEABLE
FILTER ELEMENT
21421
5950-01-381-9491INTERCHANGEABLE
TRANSFORMER,POWER
21421

Frequently Asked Questions

What is NSN 6685-00-527-7436?

NSN 6685-00-527-7436 is a Thermometer,self-Indicating, manufactured by Tycos Instruments Inc a Welch Allyn Co, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-527-7436?

NSN 6685-00-527-7436 has 1 cross-referenced part number: 21421 (Tycos Instruments Inc a Welch Allyn Co).

What NSN replaces 6685-00-527-7436?

There are 8 known substitutes for 6685-00-527-7436: 5310-00-033-3101, 3110-00-100-4221, 5935-00-118-7863 and 5 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21421?

Key specifications for 21421: Overall Length: 5.500 INCHES NOMINAL5.500 INCHES NOMINAL IN; Material: NICKEL METER CASE; Style Designator: IMMERSION RING TOP; Scale Measurement Range: +0.000 TO 220.000 DEG FAHRENHEIT+0.000 TO 220.000 DEG FAHRENHEIT. 11 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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