The Screw,shoulder, cataloged under National Stock Number 5305-00-421-6840, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-00-421-6840 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.188 INCHES NOMINAL IN |
| Fastener Length | 1.406 INCHES NOMINAL IN |
| Shoulder Length | 0.703 INCHES MINIMUM AND 0.707 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | 21 FSCM 23610 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.661 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.375 INCHES NOMINAL IN |
| Surface Treatment | NICKEL OVERALL |
| Internal Drive Style | SLOT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 4000926 | 3/9 Design control — primary reference H & E Venture, Llc |
NSN 5305-00-421-6840 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-00-421-6840: Head Height: 0.188 INCHES NOMINAL IN; Fastener Length: 1.406 INCHES NOMINAL IN; Shoulder Length: 0.703 INCHES MINIMUM AND 0.707 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: 21 FSCM 23610 MFR REF SINGLE TREATMENT RESPONSE OVERALL. 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.