FSC: 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments
FSG: 66 — Instruments and Laboratory Equipment
General Description
The Thermowell, cataloged under National Stock Number 6685-01-370-5258, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
6685-01-370-5258
Item Name
Thermowell
FSC / FSG
6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
Possible hazard — SDS may be required (DLA HMIC P)
Criticality Code
X
⇄Related Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
6685-01-417-9133POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
6685-01-437-6287POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
6685-01-437-6290POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
6685-01-437-6292POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
6685-01-438-1108POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
6685-01-598-6399POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
6685-01-647-2733POSSIBLE MATCH
THERMOWELL
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
5R-9111 ITEM 60
5/1Secondary reference
Caterpillar Inc Div Caterpillar Defense
MIL-T-24270
4/1Identification reference
U.S. Government activity
MIL-T-24270 1-E 2 CRES
2/2Government specification standardization
U.S. Government activity
M-24270-1B-E-2-CRES 316
5/1Secondary reference
Rdf Corporation
Related Parts
6685-01-417-9133POSSIBLE MATCH
THERMOWELL
6685-01-437-6287POSSIBLE MATCH
THERMOWELL
6685-01-437-6290POSSIBLE MATCH
THERMOWELL
6685-01-437-6292POSSIBLE MATCH
THERMOWELL
6685-01-438-1108POSSIBLE MATCH
THERMOWELL
6685-01-598-6399POSSIBLE MATCH
THERMOWELL
6685-01-647-2733POSSIBLE MATCH
THERMOWELL
Frequently Asked Questions
What is NSN 6685-01-370-5258?
NSN 6685-01-370-5258 is a Thermowell, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
What NSN replaces 6685-01-370-5258?
7 possible matches (shared part number, not a government interchangeability claim): 6685-01-417-9133, 6685-01-437-6287, 6685-01-437-6290. Verify interchangeability with system specifications before substitution.
What are the specifications of 6685-01-370-5258?
Key specifications for 6685-01-370-5258: Special Features: INSERTION LENGTH 2 IN. IN. 0 specifications are documented in the U.S. Government catalog.
Is NSN 6685-01-370-5258 hazardous material?
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.