The Cartridge,20 Millimeter, cataloged under National Stock Number 1305-01-288-4978, is classified within Federal Supply Class 1305 (Ammunition, Through 30mm) of the Ammunition and Explosives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 1305-01-288-4978 |
| Primary Part Number | 6264393 |
| Item Name | Cartridge,20 Millimeter |
| FSC / FSG | 1305 / 13 — Ammunition, Through 30mm |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Dot Proper Shipping Name | CARTRIDGES FOR WEAPONS, INERT PROJECTILE |
| Dot Identification Number | UN0339 |
| Dot Registration Code | EX1987120763 |
| Projectile Model Number | MK 68 MOD 4 LOCATION NOT OTHERWISE SPECIFIED |
| Cartridge Model Number | MK 149 MOD 4 LOCATION NOT OTHERWISE SPECIFIED |
| Dod Ammunition Code | 1305-A692 |
| Hazardous Material Classification Code | 1.4 DEPARTMENT OF DEFENSE HAZARD CLASS DIVISION |
| Unable to Decode | UNABLE TO DECODE |
| Cartridge Grouping Type | LINKED |
| Link Model Number | MK 7 MOD 1 |
| Gross Weight | 70.0 SHIPPING CONTAINER POUNDS AND 2210.0 PALLET POUNDS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL G — Ammunition & Explosives |
| Hazard | No hazard code in the DLA record (HMIC N) UN ID UN0339 · 1.4 DEPARTMENT OF DEFENSE HAZARD CLASS DIVISION · ships as CARTRIDGES FOR WEAPONS, INERT PROJECTILE |
| Criticality Code | N |
| Part Number | Manufacturer |
|---|---|
| 6264393 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 1305-A692 | 6/9 Informative reference only U.S. Government activity |
NSN 1305-01-288-4978 is a Cartridge,20 Millimeter, manufactured by Naval Sea Systems Command, classified under FSC 1305, Ammunition, Through 30mm. Status: active.
NSN 1305-01-288-4978 has 1 manufacturer part number on file: 6264393 (Naval Sea Systems Command).
Key specifications for 6264393: Dot Proper Shipping Name: CARTRIDGES FOR WEAPONS, INERT PROJECTILE; Dot Identification Number: UN0339; Dot Registration Code: EX1987120763; Projectile Model Number: MK 68 MOD 4 LOCATION NOT OTHERWISE SPECIFIED. 11 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). The government record also carries hazard data: DOT hazard class, UN number, or related classification fields. Special handling, storage, and shipping requirements apply per the cited government fields.
NSN 1305-01-288-4978 has DEMIL Code G. Demilitarization may be required before disposal or transfer to non-military entities.
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.