The Screw,machine, cataloged under National Stock Number 5305-01-550-1320, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Drs Environmental Systems Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-550-1320 |
| Primary Part Number | 500K2668-351 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Drs Environmental Systems Inc |
| Status | ACTIVE |
| Screw Surface Treatment | ZINC |
| Fastener Length | 0.875 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL |
| Internal Drive Style | CROSS RECESS TYPE 1 |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.285 INCHES MINIMUM AND 0.332 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 500K2668-351 | Drs Environmental Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 13218E0493-351PIIC | 3/2 Design control — primary reference U.S. Government activity |
| 500K2668-351 | 3/9 Design control — primary reference U.S. Government activity |
NSN 5305-01-550-1320 is a Screw,machine, manufactured by Drs Environmental Systems Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-550-1320 has 1 manufacturer part number on file: 500K2668-351 (Drs Environmental Systems Inc).
Key specifications for 500K2668-351: Screw Surface Treatment: ZINC; Fastener Length: 0.875 INCHES NOMINAL IN; Nominal Thread Diameter: 0.164 INCHES IN; Head Style: FLAT COUNTERSUNK. 11 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.