The Thermometer,self-Indicating,bime, cataloged under National Stock Number 6685-01-574-7529, 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 Ashcroft Inc Dba Heise. Government technical data includes 22 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-574-7529 |
| Primary Part Number | H3A4-Q |
| Item Name | Thermometer,self-Indicating,bime |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Body Diameter | 0.623 INCHES MAXIMUM IN |
| Mounting Facility Type and Quantity | 1 BACK ANGLE |
| Socket Overall Length | 5.344 INCHES NOMINAL IN |
| Stem Length | 4.000 INCHES NOMINAL IN |
| Design Type | MAXIMUM |
| Separable Socket Style | EXTENSION STEM |
| Dial Diameter | 3.000 INCHES NOMINAL IN |
| Style Designator | STRAIGHT FORM, HORIZONTAL DIAL |
| Mounting Facility Screw Thread Series Designator | UN |
| Features Provided | PROTECTIVE GLASS/PLASTIC |
| Mounting Thread Quantity | 28 PER INCH |
| Immersion Length | 2.000 INCHES NOMINAL IN |
| Body Length | 0.594 INCHES NOMINAL IN |
| Scale Type | DIAL |
| Mounting Facility Nominal Screw Thread Diameter | 0.750 INCHES IN |
| Bulb Tip Outside Diameter | 0.375 INCHES NOMINAL IN |
| Scale Measurement Range | +50.000 TO 400.000 DEG FAHRENHEIT |
| External Thread Size | 3/4 IN. UN IN |
| Internal Thread Size | 7/8 IN. UN IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Scale Adjustment Variation | ADJUSTABLE OVER ENTIRE RANGE |
| Tip Length | 4.000 INCHES NOMINAL IN |
| 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 |
|---|---|
| H3A4-Q PRIMARY | Ashcroft Inc Dba Heise (USA) |
NSN 6685-01-574-7529 is a Thermometer,self-Indicating,bime, manufactured by Ashcroft Inc Dba Heise, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-574-7529 has 1 manufacturer part number on file: H3A4-Q (Ashcroft Inc Dba Heise).
Key specifications for H3A4-Q: Body Diameter: 0.623 INCHES MAXIMUM IN; Mounting Facility Type and Quantity: 1 BACK ANGLE; Socket Overall Length: 5.344 INCHES NOMINAL IN; Stem Length: 4.000 INCHES NOMINAL IN. 22 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.