The Thumbscrew, cataloged under National Stock Number 5305-01-581-4215, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Szy Holdings, Llc Dba Szy Holdings Llc. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-581-4215 |
| Primary Part Number | 91830A634 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Szy Holdings, Llc Dba Szy Holdings Llc |
| Status | ACTIVE |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 1.375 INCHES NOMINAL IN |
| Shoulder Length | 0.500 INCHES NOMINAL ALL SHOULDERS IN |
| Shoulder Diameter | 0.625 INCHES NOMINAL ALL SHOULDERS IN |
| Thread Length | 0.625 INCHES NOMINAL IN |
| Shoulder Shape | ROUND ALL SHOULDERS |
| Hardness Rating | 80.0 ROCKWELL B NOMINAL OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | KNURLED NO. 1 |
| Thread Direction | RIGHT-HAND |
| Minimum Tensile Strength | 75000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 303 OR STEEL COMP 304 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.250 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5305-01-581-4215 is a Thumbscrew, manufactured by Szy Holdings, Llc Dba Szy Holdings Llc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-581-4215 has 2 manufacturer part numbers on file: 91830A634 (Szy Holdings, Llc Dba Szy Holdings Llc), 91830A634 (Mcmaster-Carr Supply Co).
Key specifications for 91830A634: Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 1.375 INCHES NOMINAL IN; Shoulder Length: 0.500 INCHES NOMINAL ALL SHOULDERS IN; Shoulder Diameter: 0.625 INCHES NOMINAL ALL SHOULDERS 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.