The Screw,machine, cataloged under National Stock Number 5305-01-481-5489, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Bath Iron Works Corporation. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-481-5489 |
| Primary Part Number | 8100-1256-0262 PT NO 237 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Bath Iron Works Corporation |
| Status | ACTIVE |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL COMP 316 |
| Internal Drive Style | SLOT |
| Countersink Angle | 82.0 DEGREES NOMINAL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 13 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 53159-494 | Bath Iron Works Corporation (USA) |
| 8100-1256-0262 PT NO 237 PRIMARY | Bath Iron Works Corporation (USA) |
NSN 5305-01-481-5489 is a Screw,machine, manufactured by Bath Iron Works Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-481-5489 has 2 manufacturer part numbers on file: 53159-494 (Bath Iron Works Corporation), 8100-1256-0262 PT NO 237 (Bath Iron Works Corporation).
Key specifications for 8100-1256-0262 PT NO 237: Fastener Length: 0.750 INCHES NOMINAL IN; Nominal Thread Diameter: 0.500 INCHES IN; Head Style: FLAT COUNTERSUNK; Thread Direction: RIGHT-HAND. 10 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.