The Switch,thermostatic, cataloged under National Stock Number 5930-00-708-8638, is classified within Federal Supply Class 5930 (Switches) of the Electrical and Electronic Equipment Components group. The manufacturer of record is H-B Instrument Co. Government technical data includes 7 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5930-00-708-8638 |
| Primary Part Number | 335C891H01 |
| Item Name | Switch,thermostatic |
| FSC / FSG | 5930 / 59 — Switches |
| Manufacturer | H-B Instrument Co |
| Status | ACTIVE |
| Terminal Type | WIRE LEAD |
| Overall Diameter | 0.250 INCHES NOMINAL IN |
| Temp Sensing Element Type | MERCURY |
| Nonpile-Up Contact Arrangement | 1 POLE, SINGLE THROW, BOTH POSITIONS MAINTAINED |
| Media for Which Designed | GAS OR LIQUID |
| Contact Stimulus Rating | 60.00 ACTUATION POINT MINIMUM DEGREES CELSIUS AND 70.00 ACTUATION POINT MAXIMUM DEGREES CELSIUS |
| Contact Adjustability | ACTUATION POINT NOT ADJUSTABLE |
| 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 |
|---|---|
| 335C891H01 | H-B Instrument Co (USA) |
| Reference | Meaning |
|---|---|
| 150A962H01 | 5/9 Secondary reference U.S. Government activity |
| 335C891H01 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5930-00-708-8638 is a Switch,thermostatic, manufactured by H-B Instrument Co, classified under FSC 5930, Switches. Status: active.
NSN 5930-00-708-8638 has 1 manufacturer part number on file: 335C891H01 (H-B Instrument Co).
Key specifications for 335C891H01: Terminal Type: WIRE LEAD; Overall Diameter: 0.250 INCHES NOMINAL IN; Temp Sensing Element Type: MERCURY; Overall Length: 6.000 INCHES NOMINAL IN. 7 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.