The Screw,shoulder, cataloged under National Stock Number 5305-01-372-2320, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-372-2320 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Width Across Flats | 0.312 INCHES NOMINAL IN |
| Head Height | 0.312 INCHES NOMINAL IN |
| Fastener Length | 1.625 INCHES NOMINAL IN |
| Shoulder Length | 0.875 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.437 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.750 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | SAE J412 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | ZINC OVERALL |
| Minimum Tensile Strength | 140000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL COMP 4140 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
| Reference | Meaning |
|---|---|
| 12897 | 3/9 Design control — primary reference Gaither Tool Co. |
NSN 5305-01-372-2320 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5330-01-734-3124. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-01-372-2320: Width Across Flats: 0.312 INCHES NOMINAL IN; Head Height: 0.312 INCHES NOMINAL IN; Fastener Length: 1.625 INCHES NOMINAL IN; Shoulder Length: 0.875 INCHES NOMINAL FIRST SHOULDER IN. 20 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.