PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

138125Thermometer,indicating,capillary

Ametek, Inc. Div Aerospace & Defense · NSN 6685-00-408-2722 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-408-2722 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-408-2722. Primary manufacturer part number: 138125.
Features
  • Thermometer,indicating,capillary — FSC 6685
  • Bulb Type: PLAIN RIGID
  • Bulb Quantity: 1
  • Case Diameter: 2.500 INCHES NOMINAL IN
  • Active Portion Diameter: 0.440 INCHES NOMINAL IN
  • Bulb Connection Type: THREADED
  • Active Portion Length: 2.020 INCHES NOMINAL IN
  • Bulb Overall Length: 2.580 INCHES NOMINAL IN
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Thermometer,indicating,capillary, cataloged under National Stock Number 6685-00-408-2722, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Ametek, Inc. Div Aerospace & Defense. Government technical data includes 7 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-408-2722
Primary Part Number138125
Item NameThermometer,indicating,capillary
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerAmetek, Inc. Div Aerospace & Defense
StatusACTIVE
Bulb TypePLAIN RIGID
Bulb Quantity1
Case Diameter2.500 INCHES NOMINAL IN
Active Portion Diameter0.440 INCHES NOMINAL IN
Bulb Connection TypeTHREADED
Active Portion Length2.020 INCHES NOMINAL IN
Bulb Overall Length2.580 INCHES NOMINAL IN
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 1
5930-01-329-1735138125 INTERCHANGEABLE
Switch,flow
Setra Systems, Inc. Dba Gems Sensors
Cross-Reference Index
Part NumberManufacturer
30154K Rtc Parts Inc (USA)
138125 PRIMARY Ametek, Inc. Div Aerospace & Defense (USA)
Related Parts
5930-01-329-1735INTERCHANGEABLE
SWITCH,FLOW
138125

Frequently Asked Questions

What is NSN 6685-00-408-2722?

NSN 6685-00-408-2722 is a Thermometer,indicating,capillary, manufactured by Ametek, Inc. Div Aerospace & Defense, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-408-2722?

NSN 6685-00-408-2722 has 2 cross-referenced part numbers: 30154K (Rtc Parts Inc), 138125 (Ametek, Inc. Div Aerospace & Defense).

What NSN replaces 6685-00-408-2722?

There is 1 known substitute for 6685-00-408-2722: 5930-01-329-1735. Verify interchangeability with system specifications before substitution.

What are the specifications of 138125?

Key specifications for 138125: Bulb Type: PLAIN RIGID; Bulb Quantity: 1; Case Diameter: 2.500 INCHES NOMINAL IN; Active Portion Diameter: 0.440 INCHES NOMINAL IN. 7 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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