The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-356-1708, 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 14 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-356-1708 |
| Primary Part Number | MB61-4-23 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 1.819 INCHES MINIMUM AND 1.866 INCHES MAXIMUM IN |
| Thread Length | 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.428 INCHES MINIMUM AND 1.448 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| MB61-4-23 PRIMARY | Hi-Shear Corporation (USA) |
| VAL23029-4-23 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB61-4-23 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M453-4-23 | Heartland Precision Fasteners Inc (USA) |
| ST3M453-4-23 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M453-4-23 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-4-23 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| GS1016-4-23 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M453-4-23 | Howmet Global Fastening Systems Inc (USA) |
| ST3M453-4-23 | The Boeing Company Div Defense (USA) |
| BM17019-4-23 PRIMARY | Huck International, Inc (USA) |
| ST3M453-4-23 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 11825-4-23 | Reid Products Inc. Dba Reid Products Inc (USA) |
| 109453-4-23 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| US3204-4-23 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M453-4-23 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| BM17019-4-23 | 5/9 Secondary reference U.S. Government activity |
| 109453-4-23 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5306-00-356-1708 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-356-1708 has 14 manufacturer part numbers on file: MB61-4-23 (Hi-Shear Corporation), VAL23029-4-23 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), MB61-4-23 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M453-4-23 (Heartland Precision Fasteners Inc), ST3M453-4-23 (Fastener Innovation Technology, Inc. Dba F I T) and 9 more.
Key specifications for MB61-4-23: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 1.819 INCHES MINIMUM AND 1.866 INCHES MAXIMUM IN; Thread Length: 0.371 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.250 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.