The Thermowell, cataloged under National Stock Number 6685-01-258-9275, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Weksler Glass Thermometer Corp. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-258-9275 |
| Primary Part Number | S3B4 |
| Item Name | Thermowell |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Weksler Glass Thermometer Corp |
| Status | ACTIVE |
| Style Designator | THREADED STRAIGHT SHANK |
| Bulb Tip Outside Diameter | 0.500 INCHES NOMINAL IN |
| External Thread Size | 3/4 IN. NPT3/4 IN. NPT IN |
| Bulb Tip Length | 2.500 INCHES NOMINAL IN |
| Internal Thread Size | 1/2 IN.NPT ALL BORES IN |
| Material | COPPER ALLOY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| S3B4 PRIMARY | Weksler Glass Thermometer Corp (USA) |
| Reference | Meaning |
|---|---|
| 90C01-1401-11 | C/1 Advisory reference — outside the item-of-supply concept Carrier Corp |
NSN 6685-01-258-9275 is a Thermowell, manufactured by Weksler Glass Thermometer Corp, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-258-9275 has 1 manufacturer part number on file: S3B4 (Weksler Glass Thermometer Corp).
Key specifications for S3B4: Style Designator: THREADED STRAIGHT SHANK; Overall Length: 4.000 INCHES NOMINAL4.000 INCHES NOMINAL IN; Bulb Tip Outside Diameter: 0.500 INCHES NOMINAL IN; External Thread Size: 3/4 IN. NPT3/4 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.