The Thumbscrew, cataloged under National Stock Number 5305-01-080-0676, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is Gichner Systems Group, Inc. Div C5isr Division. Government technical data includes 20 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-080-0676 |
| Primary Part Number | SM-B-20866 |
| Item Name | Thumbscrew |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | Gichner Systems Group, Inc. Div C5isr Division |
| Status | ACTIVE |
| Head Height | 0.875 INCHES NOMINAL IN |
| Point Length | 0.125 INCHES NOMINAL IN |
| Fastener Length | 2.281 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 TY 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.469 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Material Document and Classification | QQ-S-763 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Point Chamfer Angle | 90.0 DEGREES NOMINAL |
| First Diameter From Head | 0.170 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | THUMB NO. 4 |
| Thread Direction | RIGHT-HAND |
| Point Style | CONE |
| Width Between Flats | 1.062 INCHES NOMINAL IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 1.812 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 304 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| SM-B-20866 PRIMARY | Gichner Systems Group, Inc. Div C5isr Division (USA) |
| Reference | Meaning |
|---|---|
| 6000967-1 | 5/9 Secondary reference Gichner Systems Group, Inc. Div C5isr Division |
| 6000967 | 5/9 Secondary reference Gichner Systems Group, Inc. Div C5isr Division |
NSN 5305-01-080-0676 is a Thumbscrew, manufactured by Gichner Systems Group, Inc. Div C5isr Division, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-080-0676 has 1 manufacturer part number on file: SM-B-20866 (Gichner Systems Group, Inc. Div C5isr Division).
Key specifications for SM-B-20866: Head Height: 0.875 INCHES NOMINAL IN; Point Length: 0.125 INCHES NOMINAL IN; Fastener Length: 2.281 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 TY 1 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 20 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.