The Screw,shoulder, cataloged under National Stock Number 5305-01-351-3518, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Allmetal Screw Products Corp. Government technical data includes 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-351-3518 |
| Primary Part Number | 3237551 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Allmetal Screw Products Corp |
| Status | ACTIVE |
| Width Across Flats | 0.234 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Head Height | 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN |
| Fastener Length | 2.375 INCHES NOMINAL IN |
| Shoulder Length | 1.875 INCHES NOMINAL ALL SHOULDERS IN |
| Surface Treatment Document and Classification | DOD-P-16232 TYM CL4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.624 INCHES MINIMUM AND 0.625 INCHES MAXIMUM ALL SHOULDERS IN |
| Thread Length | 0.500 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 43.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Color | BLACK OVERALL |
| Surface Treatment | PHOSPHATE MANGANESE OVERALL |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.750 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 |
|---|---|
| 3237551 PRIMARY | Allmetal Screw Products Corp (USA) |
| Reference | Meaning |
|---|---|
| 3237551 | 3/9 Design control — primary reference Navair and Navsea Managed Original Design Activity Dwg Not Material/parts Supplier |
NSN 5305-01-351-3518 is a Screw,shoulder, manufactured by Allmetal Screw Products Corp, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-351-3518 has 1 manufacturer part number on file: 3237551 (Allmetal Screw Products Corp).
Key specifications for 3237551: Width Across Flats: 0.234 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN; Head Height: 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM IN; Fastener Length: 2.375 INCHES NOMINAL IN; Shoulder Length: 1.875 INCHES NOMINAL ALL SHOULDERS IN. 21 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.