The Thumbscrew, cataloged under National Stock Number 5305-00-478-0643, 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16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-00-478-0643 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN |
| Fastener Length | 3.040 INCHES MINIMUM AND 3.040 INCHES MINIMUM AND 3.060 INCHES MAXIMUM3.060 INCHES MAXIMUM IN |
| Shoulder Length | 2.790 INCHES MINIMUM AND 2.810 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.164 INCHES MINIMUM AND 0.165 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.240 INCHES MINIMUM AND 0.240 INCHES MINIMUM AND 0.260 INCHES MAXIMUM0.260 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDERROUND FIRST SHOULDER |
| Material Document and Classification | MIL-S-7720 MIL SPEC ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.138 INCHES0.138 INCHES IN |
| Head Style | KNURLED NO. 1KNURLED NO. 1 |
| Thread Direction | RIGHT-HANDRIGHT-HAND |
| Point Style | FLATFLAT |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 316 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.480 INCHES MINIMUM AND 0.520 INCHES MAXIMUM 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 |
|---|---|
| 703061-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-00-478-0643 is a Thumbscrew, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-00-478-0643: Head Height: 0.190 INCHES MINIMUM AND 0.210 INCHES MAXIMUM IN; Fastener Length: 3.040 INCHES MINIMUM AND 3.040 INCHES MINIMUM AND 3.060 INCHES MAXIMUM3.060 INCHES MAXIMUM IN; Shoulder Length: 2.790 INCHES MINIMUM AND 2.810 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.164 INCHES MINIMUM AND 0.165 INCHES MAXIMUM FIRST SHOULDER IN. 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.