The Screw,close Tolerance, cataloged under National Stock Number 5305-01-520-3818, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-520-3818 |
| Item Name | Screw,close Tolerance |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Surface Finish | 0.8 MICROMETERS THREADS |
| Surface Finish | 0.8 MICROMETERS BEARING SURFACE OF HEAD |
| Surface Finish | 0.8 MICROMETERS GRIP |
| Head Height | 2.2 MILLIMETERS MINIMUM AND 2.4 MILLIMETERS MAXIMUM MM |
| External Thread Tolerance Class | 4H6H |
| Fastener Length | 13.2 MILLIMETERS MINIMUM AND 13.8 MILLIMETERS MAXIMUM MM |
| Surface Treatment Document and Classification | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Pitch in Millimeters | 0.7 |
| Thread Length | 7.0 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | MIL-S-5000 MIL SPEC 1ST MATERIAL RESPONSE OR MIL-S-6049 MIL SPEC 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 4.0 MILLIMETERS MM |
| Head Style | PAN NO. 2 |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 80205-NA0035 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD |
| Grip Length | 5.8 MILLIMETERS MINIMUM AND 6.2 MILLIMETERS MAXIMUM MM |
| Grip Diameter | 3.965 MILLIMETERS MINIMUM AND 3.990 MILLIMETERS MAXIMUM MM |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Internal Drive Style | OFFSET CRUCIFORM (TORQUE SET) |
| Material | STEEL COMP E4340 OR STEEL COMP 8740 OVERALL |
| Thread Series Designator | MJ |
| Head Diameter | 7.7 MILLIMETERS MINIMUM AND 8.0 MILLIMETERS MAXIMUM MM |
| 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 |
|---|---|
| NA0035-040006 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-520-3818 is a Screw,close Tolerance, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-520-3818: Surface Finish: 0.8 MICROMETERS THREADS; Surface Finish: 0.8 MICROMETERS BEARING SURFACE OF HEAD; Surface Finish: 0.8 MICROMETERS GRIP; Head Height: 2.2 MILLIMETERS MINIMUM AND 2.4 MILLIMETERS MAXIMUM MM. 22 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.