The Screw,shoulder, cataloged under National Stock Number 5305-00-008-8985, 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 | 5305-00-008-8985 |
| Primary Part Number | MB300-808 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Martin-Baker Aircraft Company Limited |
| Status | ACTIVE |
| Fastener Length | 0.937 INCHES NOMINAL IN |
| Shoulder Length | 0.094 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.308 INCHES MINIMUM AND 0.310 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.752 INCHES MINIMUM AND 0.757 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CADMIUM OVERALL |
| Internal Drive Style | SLOT |
| Countersink Angle | 100.0 DEGREES NOMINAL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.500 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 |
|---|---|
| MB300-808 PRIMARY | Martin-Baker Aircraft Company Limited (GBR) |
NSN 5305-00-008-8985 is a Screw,shoulder, manufactured by Martin-Baker Aircraft Company Limited, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-008-8985 has 1 manufacturer part number on file: MB300-808 (Martin-Baker Aircraft Company Limited).
Key specifications for MB300-808: Fastener Length: 0.937 INCHES NOMINAL IN; Shoulder Length: 0.094 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Diameter: 0.308 INCHES MINIMUM AND 0.310 INCHES MAXIMUM FIRST SHOULDER IN; Thread Length: 0.752 INCHES MINIMUM AND 0.757 INCHES MAXIMUM 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.