The Screw,shoulder, cataloged under National Stock Number 5305-01-218-3801, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-218-3801 |
| Item Name | Screw,shoulder |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.250 INCHES MINIMUM IN |
| Fastener Length | 2.750 INCHES NOMINAL IN |
| Shoulder Length | 0.300 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Length | 1.700 INCHES NOMINAL SECOND SHOULDER IN |
| Shoulder Length | 2.250 INCHES NOMINAL THIRD SHOULDER IN |
| Shoulder Length | 2.500 INCHES NOMINAL FOURTH SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.220 INCHES NOMINAL FIRST SHOULDER IN |
| Shoulder Diameter | 0.130 INCHES NOMINAL FOURTH SHOULDER IN |
| Shoulder Diameter | 0.165 INCHES MINIMUM AND 0.175 INCHES MAXIMUM SECOND SHOULDER IN |
| Shoulder Diameter | 0.262 INCHES MINIMUM AND 0.268 INCHES MAXIMUM THIRD SHOULDER IN |
| Thread Length | 0.420 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Material Document and Classification | AMS5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.164 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.225 INCHES MINIMUM AND 0.240 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Internal Drive Style | W/O INTERNAL DRIVE |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 630 OVERALL |
| 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 |
|---|---|
| 3081244-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-218-3801 is a Screw,shoulder, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-218-3801: Head Height: 0.250 INCHES MINIMUM IN; Fastener Length: 2.750 INCHES NOMINAL IN; Shoulder Length: 0.300 INCHES NOMINAL FIRST SHOULDER IN; Shoulder Length: 1.700 INCHES NOMINAL SECOND SHOULDER IN. 24 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.