The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-623-5417, 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 13 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 | 5306-01-623-5417 |
| Primary Part Number | MB61-10-23 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.350 INCHES NOMINAL IN |
| Fastener Length | 2.2145 INCHES NOMINAL IN |
| Thread Length | 0.777 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.6250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.4375 INCHES NOMINAL IN |
| Width Between Flats | 1.058 INCHES NOMINAL IN |
| Grip Diameter | 0.6235 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM IN |
| 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 |
|---|---|
| ST3M453-10-23 | The Boeing Company Div Defense (USA) |
| MB61-10-23 PRIMARY | Hi-Shear Corporation (USA) |
NSN 5306-01-623-5417 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-623-5417 has 2 manufacturer part numbers on file: ST3M453-10-23 (The Boeing Company Div Defense), MB61-10-23 (Hi-Shear Corporation).
Key specifications for MB61-10-23: Head Height: 0.350 INCHES NOMINAL IN; Fastener Length: 2.2145 INCHES NOMINAL IN; Thread Length: 0.777 INCHES NOMINAL IN; Nominal Thread Diameter: 0.6250 INCHES IN. 13 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.