The Screw,cap,hexagon Head, cataloged under National Stock Number 5305-00-357-1456, 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 16 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-357-1456 |
| Primary Part Number | MB300-1271 |
| Item Name | Screw,cap,hexagon Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Martin-Baker Aircraft Company Limited |
| Status | ACTIVE |
| Head Height | 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Fastener Length | 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | DS 301-1,FSCM 04253 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.300 INCHES MINIMUM IN |
| Hole Configuration Style | HEXAGON LONGITUDINAL HOLE |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.431 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Hole Type | DRILLED |
| Hole Diameter | 0.062 INCHES NOMINAL 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 |
|---|---|
| MB300-1271 PRIMARY | Martin-Baker Aircraft Company Limited (GBR) |
NSN 5305-00-357-1456 is a Screw,cap,hexagon Head, manufactured by Martin-Baker Aircraft Company Limited, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-357-1456 has 1 manufacturer part number on file: MB300-1271 (Martin-Baker Aircraft Company Limited).
Key specifications for MB300-1271: Head Height: 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Fastener Length: 0.395 INCHES MINIMUM AND 0.405 INCHES MAXIMUM IN; Surface Treatment Document and Classification: DS 301-1,FSCM 04253 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.300 INCHES MINIMUM IN. 16 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.