The Lamp,incandescent, cataloged under National Stock Number 6240-01-074-6550, is classified within Federal Supply Class 6240 (Electric Lamps) of the Lighting Fixtures and Lamps group. The manufacturer of record is Duro-Test Lighting. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 6240-01-074-6550 |
| Primary Part Number | 169 |
| Item Name | Lamp,incandescent |
| FSC / FSG | 6240 / 62 — Electric Lamps |
| Manufacturer | Duro-Test Lighting |
| Status | ACTIVE |
| Bulb Light Transmission Characteristic | TRANSLUCENT |
| Filament Designation | C-9 |
| Base Style | MEDIUM SCREW |
| Rated Average Life | HOURS |
| Bulb Designator | AT-21 |
| Criticality Code Justification | CSMC AND AGDV |
| Filament Heavy Duty Service Rating | EXTENDED SERVICE |
| Wattage Rating | 135.000 WATTS |
| Emitted Light Characteristic | WHITE, TRANSLUCENT |
| Light Output Rating | 1900.000 LUMENS NOMINAL SINGLE RATING |
| Bulb Style | BT (BULGED TUBULAR) |
| Light Intensity Distribution Feature | INSIDE FROSTED |
| Voltage Rating | 120.000 VOLTS MINIMUM AND 125.000 VOLTS MAXIMUM |
| Average Life Rating in Hours | 4000.0 AND 5000.0 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 169 PRIMARY | Duro-Test Lighting (USA) |
| Reference | Meaning |
|---|---|
| 169 | 5/9 Secondary reference U.S. Government activity |
| 70 | 5/9 Secondary reference U.S. Government activity |
NSN 6240-01-074-6550 is a Lamp,incandescent, manufactured by Duro-Test Lighting, classified under FSC 6240, Electric Lamps. Status: active.
NSN 6240-01-074-6550 has 1 manufacturer part number on file: 169 (Duro-Test Lighting).
Key specifications for 169: Bulb Light Transmission Characteristic: TRANSLUCENT; Filament Designation: C-9; Base Style: MEDIUM SCREW; Rated Average Life: HOURS. 14 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.