PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

55-38Thermocouple,heating Element

Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments · NSN 6685-00-978-3321 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-00-978-3321 — this item is cataloged by the U.S. Government under National Stock Number 6685-00-978-3321. Primary manufacturer part number: 55-38.
Features
  • Thermocouple,heating Element — FSC 6685
  • Material: NICKEL ALLOY METER CASE
  • Terminal Type and Quantity: 8 SOCKET
  • Mounting Location: OUTSIDE METER CASE
  • Current Measuring Device Current Rating: 0.021 AMPERES
  • Overall Diameter: 1.250 INCHES NOMINAL IN
  • Case Type: CYLINDRICAL
  • 3 verified cross-references
Applications
  • Applications requiring Nickel Alloy Meter Case construction
General Description

The Thermocouple,heating Element, cataloged under National Stock Number 6685-00-978-3321, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments. Government technical data includes 6 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. 12 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6685-00-978-3321
Primary Part Number55-38
Item NameThermocouple,heating Element
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerTeledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments
StatusACTIVE
MaterialNICKEL ALLOY METER CASE
Terminal Type and Quantity8 SOCKET
Mounting LocationOUTSIDE METER CASE
Current Measuring Device Current Rating0.021 AMPERES
Overall Diameter1.250 INCHES NOMINAL IN
Case TypeCYLINDRICAL
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 12
5905-00-174-8067K45258-500 INTERCHANGEABLE
Resistor,fixed,wire Wound,induct
Ward Leonard Ct Llc
5999-00-325-8999 INTERCHANGEABLE
Delay Line
5950-00-441-78763155896 INTERCHANGEABLE
Transformer,power
Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier
5305-00-637-0603 INTERCHANGEABLE
Setscrew
5905-00-677-0568156PS120 INTERCHANGEABLE
Resistor Set,matched
Honeywell International Inc Dba Honeywell International Div New England Instrument (nei)
5935-00-839-70257616239P1 INTERCHANGEABLE
Connector,receptacle,electrical
Lockheed Martin Corporation Div Rms
3460-00-895-244055-38 INTERCHANGEABLE
Indexing Fixture
Safran Test Cells, Inc
6105-00-912-734508TGSM1242-1 INTERCHANGEABLE
Motor-Tachometer Generator
Ametek Technical & Industrial Products, Inc. Dba Tachtronic Instruments Division Div Ametek Technical and Industrial Products, Inc.
2640-00-999-78865538 INTERCHANGEABLE
Valve,pneumatic Tire
Schrader-Bridgeport International Inc Dba Schrader Automotive
6685-01-025-56715518 INTERCHANGEABLE
Thermostat,flow Control
Gates Corporation
Cross-Reference Index
Part NumberManufacturer
DV6M Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments (USA)
55-38 PRIMARY Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments (USA)
432-0302-003 The Boeing Company Div Legacy Boeing Hb1 (USA)
Related Parts
5905-00-174-8067INTERCHANGEABLE
RESISTOR,FIXED,WIRE WOUND,INDUCT
K45258-500
5999-00-325-8999INTERCHANGEABLE
DELAY LINE
5950-00-441-7876INTERCHANGEABLE
TRANSFORMER,POWER
3155896
5305-00-637-0603INTERCHANGEABLE
SETSCREW
5905-00-677-0568INTERCHANGEABLE
RESISTOR SET,MATCHED
156PS120
5935-00-839-7025INTERCHANGEABLE
CONNECTOR,RECEPTACLE,ELECTRICAL
7616239P1
3460-00-895-2440INTERCHANGEABLE
INDEXING FIXTURE
55-38
6105-00-912-7345INTERCHANGEABLE
MOTOR-TACHOMETER GENERATOR
08TGSM1242-1
2640-00-999-7886INTERCHANGEABLE
VALVE,PNEUMATIC TIRE
5538
6685-01-025-5671INTERCHANGEABLE
THERMOSTAT,FLOW CONTROL
5518
6550-01-146-4175INTERCHANGEABLE
CONTROL,GLUCOSE
5538
5895-01-169-1758INTERCHANGEABLE
SPEED CONTROL INDICATOR
553-8

Frequently Asked Questions

What is NSN 6685-00-978-3321?

NSN 6685-00-978-3321 is a Thermocouple,heating Element, manufactured by Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments, classified under FSC 6685 (No Item Name Available). Status: active.

What are the part numbers for NSN 6685-00-978-3321?

NSN 6685-00-978-3321 has 3 cross-referenced part numbers: DV6M (Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments), 55-38 (Teledyne Instruments, Inc. Dba Teledyne Hastings Instruments Div Teledyne Hastings Instruments), 432-0302-003 (The Boeing Company Div Legacy Boeing Hb1).

What NSN replaces 6685-00-978-3321?

There are 12 known substitutes for 6685-00-978-3321: 5905-00-174-8067, 5999-00-325-8999, 5950-00-441-7876 and 9 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 55-38?

Key specifications for 55-38: Material: NICKEL ALLOY METER CASE; Terminal Type and Quantity: 8 SOCKET; Mounting Location: OUTSIDE METER CASE; Current Measuring Device Current Rating: 0.021 AMPERES. 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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