The Thumbscrew, cataloged under National Stock Number 5305-01-047-8818, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Penn Scientific Products Company Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-047-8818 |
| Primary Part Number | 21C5237P17 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Penn Scientific Products Company Inc |
| Status | ACTIVE |
| Point Diameter | 0.180 INCHES NOMINAL IN |
| Head Height | 0.188 INCHES NOMINAL IN |
| Point Length | 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN |
| Fastener Length | 0.560 INCHES NOMINAL IN |
| Thread Length | 0.380 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN |
| Material Document and Classification | AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | KNURLED NO. 1 |
| Thread Direction | RIGHT-HAND |
| Point Style | DOG |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 1.000 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 |
| Part Number | Manufacturer |
|---|---|
| 21C5237P17 | Danvers Engineering Co Inc (USA) |
| 21C5237P17 PRIMARY | Penn Scientific Products Company Inc (USA) |
| 21C5237P17 | Boniface Tool & Die Inc (USA) |
| 21C5237P17 | Mar-Con Tool Company (USA) |
| Reference | Meaning |
|---|---|
| 21C5237P17 | 7/2 Vendor item drawing reference General Electric Company |
NSN 5305-01-047-8818 is a Thumbscrew, manufactured by Penn Scientific Products Company Inc, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-047-8818 has 4 manufacturer part numbers on file: 21C5237P17 (Danvers Engineering Co Inc), 21C5237P17 (Penn Scientific Products Company Inc), 21C5237P17 (Boniface Tool & Die Inc), 21C5237P17 (Mar-Con Tool Company).
Key specifications for 21C5237P17: Point Diameter: 0.180 INCHES NOMINAL IN; Head Height: 0.188 INCHES NOMINAL IN; Point Length: 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN; Fastener Length: 0.560 INCHES NOMINAL IN. 15 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.