The Bolt,machine, cataloged under National Stock Number 5306-01-668-6992, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-668-6992 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES BEARING SURFACE OF HEAD |
| Extended Washer Thickness | 0.146 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN |
| Head Height | 0.430 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN |
| Fastener Length | 1.234 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | FF-S-86 FED SPEC SINGLE TREATMENT RESPONSE OR MIL-F-18240 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.642 INCHES MINIMUM AND 0.656 INCHES MAXIMUM IN |
| Thread Length | 1.250 INCHES NOMINAL IN |
| Hardness Rating | 80.0 ROCKWELL B MINIMUM OVERALL |
| Material Document and Classification | NO.66 OR INTERCHANGEABLE WITH 16:18 ALLOY STEEL FED STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.4375 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 96906-MS21099(ASG) GOVERNMENT SPECIFICATION |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 80000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 302 OR STEEL COMP 303 OR STEEL COMP 304 OR STEEL COMP 305 OR STEEL COMP 316 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| MS21099-67 | 5/1 Secondary reference U.S. Government activity |
| MS21099-67 | 2/2 Government specification standardization U.S. Government activity |
NSN 5306-01-668-6992 is a Bolt,machine, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-668-6992: Surface Finish: 125.0 MICROINCHES BEARING SURFACE OF HEAD; Extended Washer Thickness: 0.146 INCHES MINIMUM AND 0.166 INCHES MAXIMUM IN; Head Height: 0.430 INCHES MINIMUM AND 0.437 INCHES MAXIMUM IN; Fastener Length: 1.234 INCHES MINIMUM AND 1.281 INCHES MAXIMUM IN. 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.