The Screw,machine, cataloged under National Stock Number 5305-01-538-7964, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Martin-Baker Aircraft Company Limited. Government technical data includes 7 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-538-7964 |
| Primary Part Number | P38263 |
| Item Name | Screw,machine |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Martin-Baker Aircraft Company Limited |
| Status | ACTIVE |
| Fastener Length | 1.438 INCHES NOMINAL IN |
| Screw Material Document and Classification | MS14191 MIL SPEC SINGLE MATERIAL RESPONSE |
| Nominal Thread Diameter | 0.507 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Screw Material | STEEL |
| Thread Class | 3A A |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| P38263 | Martin-Baker Aircraft Company Limited (GBR) |
| Reference | Meaning |
|---|---|
| NAS1221R4E23 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-538-7964 is a Screw,machine, manufactured by Martin-Baker Aircraft Company Limited, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-538-7964 has 1 manufacturer part number on file: P38263 (Martin-Baker Aircraft Company Limited).
Key specifications for P38263: Fastener Length: 1.438 INCHES NOMINAL IN; Screw Material Document and Classification: MS14191 MIL SPEC SINGLE MATERIAL RESPONSE; Nominal Thread Diameter: 0.507 INCHES IN; Thread Direction: RIGHT-HAND. 7 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.