The Bolt,machine, cataloged under National Stock Number 5306-01-556-3079, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Timken Gears & Services Inc. Div Philadelphia Gear. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-556-3079 |
| Primary Part Number | 006643028-121 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Timken Gears & Services Inc. Div Philadelphia Gear |
| Status | ACTIVE |
| Head Height | 0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN |
| Fastener Length | 2.260 INCHES NOMINAL IN |
| Thread Length | 2.260 INCHES NOMINAL IN |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 1.575 INCHES MINIMUM AND 1.625 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 8 |
| 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 |
|---|---|
| 006643028-121 PRIMARY | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| 6643028-121 | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| 038G4122G-1 ITEM 47 | Timken Gears & Services Inc. Div Philadelphia Gear (USA) |
| Reference | Meaning |
|---|---|
| 006643028-121 | 5/9 Secondary reference General Electric Company |
| 038G4122G-1 ITEM 47 | 5/9 Secondary reference General Electric Company |
| 6643028-121 | 5/9 Secondary reference General Electric Company |
NSN 5306-01-556-3079 is a Bolt,machine, manufactured by Timken Gears & Services Inc. Div Philadelphia Gear, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-556-3079 has 3 manufacturer part numbers on file: 006643028-121 (Timken Gears & Services Inc. Div Philadelphia Gear), 6643028-121 (Timken Gears & Services Inc. Div Philadelphia Gear), 038G4122G-1 ITEM 47 (Timken Gears & Services Inc. Div Philadelphia Gear).
Key specifications for 006643028-121: Head Height: 0.591 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN; Fastener Length: 2.260 INCHES NOMINAL IN; Thread Length: 2.260 INCHES NOMINAL IN; Nominal Thread Diameter: 1.000 INCHES IN. 10 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.