The Bolt,shear, cataloged under National Stock Number 5306-01-406-2978, 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 19 specifications, cited from the U.S. Government catalog. The record lists 17 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-406-2978 |
| Primary Part Number | MB84-6-20 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN |
| Head Height | 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN |
| Fastener Length | 2.039 INCHES MINIMUM AND 2.069 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 0.639 INCHES MINIMUM AND 0.649 INCHES MAXIMUM IN |
| Thread Length | 0.814 INCHES NOMINAL IN |
| Material Document and Classification | PH13-8MO MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Width Between Flats | 0.439 INCHES NOMINAL IN |
| Grip Diameter | 0.374 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| S11-1059-6-20 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| S371-6-20 | Huck International, Inc (USA) |
| MB84-6-20 PRIMARY | Hi-Shear Corporation (USA) |
| 11831-6-20 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M571-6-20 PRIMARY | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-6-20 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M571-6-20 | The Boeing Company Div Defense (USA) |
| AIC752-6-20 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| BM3326-6-20 | Huck International, Inc (USA) |
| SLB253-6-20 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| S3060-6-20 | Howmet Global Fastening Systems Inc (USA) |
| ST3M571-6-20 | Houston Precision Fasteners I Lp (USA) |
| GS1030-6-20 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| HP7571-6-20 | Heartland Precision Fasteners Inc (USA) |
| ST3M571-6-20 | Saturn Fasteners Inc (USA) |
| VAL23033-6-20 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 74328-6-20 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| S371-6-20 | 5/9 Secondary reference U.S. Government activity |
| VS3060-6-20 | 5/9 Secondary reference U.S. Government activity |
| 74328-6-20 | 5/2 Secondary reference U.S. Government activity |
| MB84-6-20 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| RA22018-6-20 | 5/9 Secondary reference U.S. Government activity |
| 74328-6-20 | 5/9 Secondary reference Sps Technologies Inc |
| BM3326-6-20 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-406-2978 is a Bolt,shear, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-406-2978 has 17 manufacturer part numbers on file: S11-1059-6-20 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), S371-6-20 (Huck International, Inc), MB84-6-20 (Hi-Shear Corporation), 11831-6-20 (Reid Products Inc. Dba Reid Products Inc), ST3M571-6-20 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners) and 12 more.
Key specifications for MB84-6-20: Extended Washer Thickness: 0.081 INCHES MINIMUM AND 0.101 INCHES MAXIMUM IN; Head Height: 0.378 INCHES MINIMUM AND 0.398 INCHES MAXIMUM IN; Fastener Length: 2.039 INCHES MINIMUM AND 2.069 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 19 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.