The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-623-5158, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hi-Shear Corporation. Government technical data includes 14 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-623-5158 |
| Primary Part Number | MB61-9-30 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.328 INCHES NOMINAL IN |
| Fastener Length | 1.287 INCHES NOMINAL IN |
| Thread Length | 0.725 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.5625 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.875 INCHES NOMINAL IN |
| Width Between Flats | 0.986 INCHES MINIMUM IN |
| Grip Diameter | 0.5610 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| MB61-9-30 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M453-9-30 | The Boeing Company Div Defense (USA) |
NSN 5306-01-623-5158 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-623-5158 has 2 manufacturer part numbers on file: MB61-9-30 (Hi-Shear Corporation), ST3M453-9-30 (The Boeing Company Div Defense).
Key specifications for MB61-9-30: Head Height: 0.328 INCHES NOMINAL IN; Fastener Length: 1.287 INCHES NOMINAL IN; Thread Length: 0.725 INCHES NOMINAL IN; Nominal Thread Diameter: 0.5625 INCHES IN. 14 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.