The Light-Switch, cataloged under National Stock Number 5999-00-503-9906, is classified within Federal Supply Class 5999 (Miscellaneous Electrical and Electronic Components) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 17 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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. Unit of issue: EA.
| Parameter | Value |
|---|---|
| NSN | 5999-00-503-9906 |
| Primary Part Number | 499591 |
| Item Name | Light-Switch |
| FSC / FSG | 5999 / 59 — Miscellaneous Electrical and Electronic Components |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Mounting Facility Quantity | 2 |
| Current Type and Rating in Amps | 10.00 AC NOMINAL |
| Lens Color | RED |
| Mounting Method | BRACKET(S) |
| Shape | RECTANGULAR BOX |
| Shape | RECTANGULAR COVER |
| Features Provided | LENS |
| Lamp Base Type Accommodated | DOUBLE CONTACT BAYONET CANDELABRA |
| Operating Voltage in Volts | 125.0 NOMINAL |
| Switch Type | ROTARY |
| Switch Contact Arrangement | 2 POLE, SINGLE THROW, BOTH POSITIONS MAINTAINED |
| Surface Treatment | PAINT BOX |
| Surface Treatment | PAINT COVER |
| Material | STEEL BOX |
| Material | STEEL COVER |
| Furnished Items | BOX AND COVER |
| Hazardous Locations/environmental Protection | WATERTIGHT-NEMA TYPE 4 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Shelf Life Code | 0 |
| Criticality Code | X |
| Unit of Issue | EA |
| Acquisition advice code | J |
| Part Number | Manufacturer |
|---|---|
| 499591 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 499591 | 5/9 Secondary reference U.S. Government activity |
NSN 5999-00-503-9906 is a Light-Switch, manufactured by Naval Sea Systems Command, classified under FSC 5999, Miscellaneous Electrical and Electronic Components. Status: active.
NSN 5999-00-503-9906 has 1 manufacturer part number on file: 499591 (Naval Sea Systems Command).
Key specifications for 499591: Overall Height: 3.000 INCHES NOMINAL IN; Mounting Facility Quantity: 2; Current Type and Rating in Amps: 10.00 AC NOMINAL; Lens Color: RED. 17 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.