PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

21561Thermometer,indicating,capillary

Electro Impulse Laboratory Inc Dba Electro Impulse Inc · NSN 6685-01-178-5852 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-178-5852 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-178-5852. Primary manufacturer part number: 21561.
Features
  • Thermometer,indicating,capillary — FSC 6685
  • Active Portion Length: 7.000 INCHES NOMINAL IN
  • Flexible Tube Length: 60.000 INCHES NOMINAL IN
  • Extension Neck Length: 0.001 INCHES NOMINAL IN
  • Scale Type: DIAL
  • Material: COPPER BULB
  • Style Designator: PLAIN RIGID
  • Material: STEEL METER CASE
Applications
  • Applications requiring Copper Bulb construction
General Description

The Thermometer,indicating,capillary, cataloged under National Stock Number 6685-01-178-5852, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Electro Impulse Laboratory Inc Dba Electro Impulse Inc. Government technical data includes 20 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 3 commercial cross-references from 2 manufacturers, 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
NSN6685-01-178-5852
Primary Part Number21561
Item NameThermometer,indicating,capillary
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerElectro Impulse Laboratory Inc Dba Electro Impulse Inc
StatusACTIVE
Active Portion Length7.000 INCHES NOMINAL IN
Flexible Tube Length60.000 INCHES NOMINAL IN
Extension Neck Length0.001 INCHES NOMINAL IN
Scale TypeDIAL
MaterialCOPPER BULB
Style DesignatorPLAIN RIGID
MaterialSTEEL METER CASE
MaterialCOPPER CAPILLARY TUBE
Dial Diameter3.500 INCHES NOMINAL IN
Bulb TypePLAIN RIGID
Bulb Tip Length7.000 INCHES NOMINAL IN
Bulb Overall Length7.000 INCHES NOMINAL IN
Bulb Quantity1
Active Portion Diameter0.500 INCHES NOMINAL IN
Bulb StylePLAIN BULB
Pointer/pen Type and Quantity1 INDICATING SINGLE
Scale Measurement Range-20.000 TO 120.000 DEG FAHRENHEIT
Actuating MediumVAPOR TENSION
Bulb Connection TypeUNION
Case Diameter3.700 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
3020-00-517-2189206-453 INTERCHANGEABLE
Gear,spur
Northrop Grumman Systems Corp Dba Northrop Grumman Systems Corp
2815-00-791-1433132830 INTERCHANGEABLE
Cylinder Sleeve
Cummins Inc.
5330-00-937-05312156-1 INTERCHANGEABLE
Gasket
Clariant Corp Div Clariant Corporation
5330-01-124-8993P122-1 INTERCHANGEABLE
Gasket
Kahlenberg Industries, Inc. Dba Kahlenberg Industries Inc
5310-01-342-098821561 INTERCHANGEABLE
Washer,lock
Stanadyne Corporation Dba Stanadyne Diesel Systems Div Diesel Systems
4010-01-417-9033678333 INTERCHANGEABLE
Chain,welded
Columbus Mckinnon Corp
Cross-Reference Index
Part NumberManufacturer
1300-U-3 1/2-UC/B-M20-P120DEG F Texas Gage Co (USA)
21561 PRIMARY Electro Impulse Laboratory Inc Dba Electro Impulse Inc (USA)
B21561 Electro Impulse Laboratory Inc Dba Electro Impulse Inc (USA)
Related Parts
3020-00-517-2189INTERCHANGEABLE
GEAR,SPUR
206-453
2815-00-791-1433INTERCHANGEABLE
CYLINDER SLEEVE
132830
5330-00-937-0531INTERCHANGEABLE
GASKET
2156-1
5330-01-124-8993INTERCHANGEABLE
GASKET
P122-1
5310-01-342-0988INTERCHANGEABLE
WASHER,LOCK
21561
4010-01-417-9033INTERCHANGEABLE
CHAIN,WELDED
678333

Frequently Asked Questions

What is NSN 6685-01-178-5852?

NSN 6685-01-178-5852 is a Thermometer,indicating,capillary, manufactured by Electro Impulse Laboratory Inc Dba Electro Impulse Inc, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-01-178-5852?

NSN 6685-01-178-5852 has 3 cross-referenced part numbers: 1300-U-3 1/2-UC/B-M20-P120DEG F (Texas Gage Co), 21561 (Electro Impulse Laboratory Inc Dba Electro Impulse Inc), B21561 (Electro Impulse Laboratory Inc Dba Electro Impulse Inc).

What NSN replaces 6685-01-178-5852?

There are 6 known substitutes for 6685-01-178-5852: 3020-00-517-2189, 2815-00-791-1433, 5330-00-937-0531 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 21561?

Key specifications for 21561: Active Portion Length: 7.000 INCHES NOMINAL IN; Flexible Tube Length: 60.000 INCHES NOMINAL IN; Extension Neck Length: 0.001 INCHES NOMINAL IN; Scale Type: DIAL. 20 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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