The Screw,shoulder, cataloged under National Stock Number 5305-00-332-3909, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 13 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 | 5305-00-332-3909 |
| Primary Part Number | MB300-1225 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Width Across Flats | 0.320 INCHES NOMINAL IN |
| Head Height | 0.125 INCHES NOMINAL IN |
| Fastener Length | 1.100 INCHES NOMINAL IN |
| Shoulder Length | 0.507 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.440 INCHES MINIMUM AND 0.443 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT CHAMFER |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Thread Series Designator | UNF |
| Head Diameter | 0.553 INCHES MINIMUM AND 0.556 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 |
|---|---|
| MB300-1225 PRIMARY | Naval Inventory Control Point Mechanicsburg (USA) |
NSN 5305-00-332-3909 is a Screw,shoulder, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 5305, Screws. Status: active.
NSN 5305-00-332-3909 has 1 manufacturer part number on file: MB300-1225 (Naval Inventory Control Point Mechanicsburg).
Key specifications for MB300-1225: Width Across Flats: 0.320 INCHES NOMINAL IN; Head Height: 0.125 INCHES NOMINAL IN; Fastener Length: 1.100 INCHES NOMINAL IN; Shoulder Length: 0.507 INCHES MINIMUM AND 0.510 INCHES MAXIMUM FIRST SHOULDER IN. 13 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.