The Thumbscrew, cataloged under National Stock Number 5305-01-160-1981, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-160-1981 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Status | ACTIVE |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 1.810 INCHES NOMINAL IN |
| Shoulder Length | 0.250 INCHES NOMINAL FIRST SHOULDER IN |
| Surface Treatment Document and Classification | MIL-C-13924 CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.500 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.380 INCHES NOMINAL IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.170 INCHES MINIMUM AND 0.175 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | KNURLED NO. 1 |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 1.180 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | OXIDE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.980 INCHES MINIMUM AND 1.020 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 |
|---|---|
| SM-C-852090-2 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5305-01-160-1981 is a Thumbscrew, classified under FSC 5305, Screws. Status: active.
Key specifications for 5305-01-160-1981: Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 1.810 INCHES NOMINAL IN; Shoulder Length: 0.250 INCHES NOMINAL FIRST SHOULDER IN; Surface Treatment Document and Classification: MIL-C-13924 CL 4 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL. 21 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.