The Thermowell, cataloged under National Stock Number 6685-01-168-2916, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-168-2916 |
| Item Name | Thermowell |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Style Designator | THREADED STRAIGHT SHANK |
| Bulb Tip Outside Diameter | 0.438 INCHES NOMINAL IN |
| External Thread Size | 1/2 IN. NPT1/2 IN. NPT IN |
| Bulb Tip Length | 3.500 INCHES NOMINAL IN |
| Internal Thread Size | 5/8 IN.NPT ALL BORES IN |
| Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 30-5/8-18 | 3/9 Design control — primary reference Liftec Inc Div Liftec, Inc. |
| 2438895-2 | 7/2 Vendor item drawing reference Honeywell Intl Inc Defense Avionics Systems Former Test Systems Div |
NSN 6685-01-168-2916 is a Thermowell, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5331-01-417-1069. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-01-168-2916: Style Designator: THREADED STRAIGHT SHANK; Overall Length: 4.875 INCHES NOMINAL4.875 INCHES NOMINAL IN; Bulb Tip Outside Diameter: 0.438 INCHES NOMINAL IN; External Thread Size: 1/2 IN. NPT1/2 IN. NPT IN. 6 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
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.