The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-047-1000, 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 16 specifications, cited from the U.S. Government catalog. The record lists 20 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-047-1000 |
| Primary Part Number | MB84-4-14 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.057 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Fastener Length | 1.328 INCHES MINIMUM AND 1.358 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN |
| Thread Length | 0.443 INCHES MINIMUM AND 0.493 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.865 INCHES MINIMUM AND 0.885 INCHES MAXIMUM IN |
| Width Between Flats | 0.304 INCHES MINIMUM AND 0.313 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| 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 |
|---|---|
| MB84-4-14 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M571-4-14 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| VS3060-4-14 PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| MB84-4-14 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| PBF23T-4P-14 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-4-14 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| S11-1059-4-14 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M571-4-14 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S371-4-14 PRIMARY | Huck International, Inc (USA) |
| ST3M571-4-14 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| VAL23033-4-14 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| GS1030-4-14 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M571-4-14 | Houston Precision Fasteners I Lp (USA) |
| ST3M571-4-14 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M571-4-14 | Saturn Fasteners Inc (USA) |
| ST3M571-4-14 | Heartland Precision Fasteners Inc (USA) |
| AIC752-4-14 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BM3326-4-14 PRIMARY | Huck International, Inc (USA) |
| ST3M571-4-14 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-4-14 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| S371-4-14 | 5/9 Secondary reference U.S. Government activity |
| 74328-4-14 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 74328-4-14 | 3/2 Design control — primary reference U.S. Government activity |
| VS3060-4-14 | 5/9 Secondary reference U.S. Government activity |
| BM3326-4-14 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-047-1000 is a Bolt,close Tolerance, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-047-1000 has 20 manufacturer part numbers on file: MB84-4-14 (Hi-Shear Corporation), ST3M571-4-14 (Fastener Innovation Technology, Inc. Dba F I T), VS3060-4-14 (Howmet Global Fastening Systems Inc), MB84-4-14 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), PBF23T-4P-14 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 15 more.
Key specifications for MB84-4-14: Extended Washer Thickness: 0.057 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Fastener Length: 1.328 INCHES MINIMUM AND 1.358 INCHES MAXIMUM IN; Extended Washer Diameter: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN. 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.