The Screw,shoulder, cataloged under National Stock Number 5305-00-437-2178, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 17 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-437-2178 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.063 INCHES NOMINAL IN |
| Fastener Length | 0.550 INCHES NOMINAL IN |
| Shoulder Length | 0.164 INCHES MINIMUM AND 0.174 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.3112 INCHES MINIMUM AND 0.3117 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.246 INCHES MINIMUM AND 0.256 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | MIL-S-6050 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 8630 OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.438 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 |
|---|---|
| 147314 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-00-437-2178 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 1325-01-061-3117, 3431-01-507-0872. Verify interchangeability with system specifications before substitution.
Key specifications for 5305-00-437-2178: Head Height: 0.063 INCHES NOMINAL IN; Fastener Length: 0.550 INCHES NOMINAL IN; Shoulder Length: 0.164 INCHES MINIMUM AND 0.174 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.3112 INCHES MINIMUM AND 0.3117 INCHES MAXIMUM FIRST SHOULDER IN. 17 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.