The Bolt,machine, cataloged under National Stock Number 5306-00-274-1981, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hatch & Kirk, Inc.. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-274-1981 |
| Primary Part Number | 3213100 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| Head Height | 0.749 INCHES MINIMUM AND 0.813 INCHES MAXIMUM IN |
| Fastener Length | 8.125 INCHES NOMINAL IN |
| Thread Length | 2.000 INCHES MINIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.219 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | SAE GR 8 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 1.250 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Departure From Cited Designator | AS MODIFIED BY HEAD H,THD LG AND COTTER PIN HOLE |
| Width Between Flats | 1.812 INCHES MINIMUM AND 1.875 INCHES MAXIMUM IN |
| Nondefinitive Spec/std Data | 3 TYPE AND 8 GRADE |
| Minimum Tensile Strength | 150000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 7.750 INCHES NOMINAL FIRST HOLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5306-00-274-1981 is a Bolt,machine, manufactured by Hatch & Kirk, Inc., classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-274-1981 has 2 manufacturer part numbers on file: 3213100 (Hatch & Kirk, Inc.), 3235079 (Hatch & Kirk, Inc.).
Key specifications for 3213100: Head Height: 0.749 INCHES MINIMUM AND 0.813 INCHES MAXIMUM IN; Fastener Length: 8.125 INCHES NOMINAL IN; Thread Length: 2.000 INCHES MINIMUM IN; Hardness Rating: 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL. 19 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.