The Bolt,machine, cataloged under National Stock Number 5306-01-251-2904, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-251-2904 |
| Primary Part Number | 552-5588541 ITEM NO. 59 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Head Height | 0.195 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN |
| Fastener Length | 5.400 INCHES MINIMUM AND 5.560 INCHES MAXIMUM IN |
| Thread Length | 0.875 INCHES NOMINAL IN |
| Hardness Rating | 80.0 ROCKWELL B MINIMUM OVERALL |
| Material Document and Classification | SAE GR 2 ASSN STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.484 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 75000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 55000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL 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 |
|---|---|
| 552-5588541 ITEM NO. 59 PRIMARY | Naval Sea Systems Command (USA) |
| 2300-3331 ITEM NO. 59 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 552-5588541 ITE | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
NSN 5306-01-251-2904 is a Bolt,machine, manufactured by Naval Sea Systems Command, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-251-2904 has 2 manufacturer part numbers on file: 552-5588541 ITEM NO. 59 (Naval Sea Systems Command), 2300-3331 ITEM NO. 59 (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 552-5588541 ITEM NO. 59: Head Height: 0.195 INCHES MINIMUM AND 0.235 INCHES MAXIMUM IN; Fastener Length: 5.400 INCHES MINIMUM AND 5.560 INCHES MAXIMUM IN; Thread Length: 0.875 INCHES NOMINAL IN; Hardness Rating: 80.0 ROCKWELL B MINIMUM OVERALL. 16 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.