The Thumbscrew, cataloged under National Stock Number 5305-01-397-5920, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 14 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5305-01-397-5920 |
| Primary Part Number | C99S12248-11 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Head Height | 1.790 INCHES NOMINAL IN |
| Fastener Length | 5.620 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-C-320 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 4.320 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A36 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.875 INCHES IN |
| Head Style | FLAT FILLISTER |
| Thread Direction | RIGHT-HAND |
| Surface Treatment | CHROMIUM OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 14 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 1.500 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 |
|---|---|
| C99S12248-11 PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| C99S12248-11 | 3/9 Design control — primary reference Northrop Grumman Systems Corporation |
NSN 5305-01-397-5920 is a Thumbscrew, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-397-5920 has 1 manufacturer part number on file: C99S12248-11 (Northrop Grumman Systems Corporation).
Key specifications for C99S12248-11: Head Height: 1.790 INCHES NOMINAL IN; Fastener Length: 5.620 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-C-320 CL2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 4.320 INCHES NOMINAL IN. 14 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.