The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-077-3097, 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 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-077-3097 |
| Primary Part Number | MB61-3-40 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Head Height | 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Fastener Length | 2.815 INCHES MINIMUM AND 2.862 INCHES MAXIMUM IN |
| Thread Length | 0.305 INCHES MINIMUM AND 0.372 INCHES MAXIMUM IN |
| Material Document and Classification | 23-112 TYB FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN |
| Width Between Flats | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| 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 |
|---|---|
| ST3M453-3-40 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MB61-3-40 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M453-3-40 | Heartland Precision Fasteners Inc (USA) |
| ST3M453-3-40 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M453-3-40 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-3-40 | Huck International, Inc (USA) |
| GS1016-3-40 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M453-3-40 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M453-3-40 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M453-3-40 | Howmet Global Fastening Systems Inc (USA) |
| ST3M453-3-40 | The Boeing Company Div Defense (USA) |
| ST3M453-3-40 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 11825-3-40 | Reid Products Inc. Dba Reid Products Inc (USA) |
| Reference | Meaning |
|---|---|
| BM17019-3-40 | 5/9 Secondary reference U.S. Government activity |
| ST3M453-3-40 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| RA32003-3-40 | 5/9 Secondary reference Parker (toggles) Ltd |
| US3204-3-40 | 5/2 Secondary reference U.S. Government activity |
| BM17019-3-40 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| S353-3-40 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-077-3097 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-077-3097 has 13 manufacturer part numbers on file: ST3M453-3-40 (Sps Technologies, Llc Dba PB Fasteners), MB61-3-40 (Hi-Shear Corporation), ST3M453-3-40 (Heartland Precision Fasteners Inc), ST3M453-3-40 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M453-3-40 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries) and 8 more.
Key specifications for MB61-3-40: Head Height: 0.130 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN; Fastener Length: 2.815 INCHES MINIMUM AND 2.862 INCHES MAXIMUM IN; Thread Length: 0.305 INCHES MINIMUM AND 0.372 INCHES MAXIMUM IN; Material Document and Classification: 23-112 TYB FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL. 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.