The Bolt,shear, cataloged under National Stock Number 5306-01-112-9179, 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 20 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through both NSN and commercial part number lookups. 13 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-112-9179 |
| Primary Part Number | MB84-8D57 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hi-Shear Corporation |
| Status | ACTIVE |
| Extended Washer Thickness | 0.113 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN |
| Head Height | 0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN |
| Fastener Length | 4.315 INCHES MINIMUM AND 4.345 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN |
| Thread Length | 0.742 INCHES MINIMUM AND 0.792 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | 23-112,TYPE A,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 3.553 INCHES MINIMUM AND 3.573 INCHES MAXIMUM IN |
| Width Between Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Grip Diameter | 0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 4.069 INCHES MINIMUM AND 4.109 INCHES MAXIMUM FIRST HOLE IN |
| 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 |
|---|---|
| ST3M571-8D57 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MB84-8D57 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M571-8D57 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-8D57 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M571-8D57 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 11831-8D57 | Reid Products Inc. Dba Reid Products Inc (USA) |
| AIC752-8D57 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M571-8D57 | Saturn Fasteners Inc (USA) |
| GS1030-8D57 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S11-1059-8D57 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| VS3060-8D57 | Howmet Global Fastening Systems Inc (USA) |
| ST3M571-8D57 | J M Precision Inc (USA) |
| VAL23033-8D57 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-8D57 | Houston Precision Fasteners I Lp (USA) |
| ST3M571-8D57 | Heartland Precision Fasteners Inc (USA) |
| ST3M571-8D57 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M571-8D57 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| S371-8D57 | 5/9 Secondary reference U.S. Government activity |
| S371-8D57 | 5/9 Secondary reference Huck International, Inc |
| ST3M571-8D57 | 5/9 Secondary reference U.S. Government activity |
| 8M3326-8D57 | 5/9 Secondary reference Huck International, Inc |
| VS3060-8D57 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-8D57 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| BM3326-8D57 | 5/9 Secondary reference U.S. Government activity |
| 74328-8D57 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| 8M3326-8D57 | 5/9 Secondary reference U.S. Government activity |
| 74328-8D57 | 5/2 Secondary reference U.S. Government activity |
| BM3326-8D57 | 5/9 Secondary reference Huck International, Inc |
| MB84-8D57 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| PBF23T-8D57 | 5/9 Secondary reference Sps Technologies Llc Dba PB Fasteners Div PB Fasteners |
NSN 5306-01-112-9179 is a Bolt,shear, manufactured by Hi-Shear Corporation, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-112-9179 has 17 manufacturer part numbers on file: ST3M571-8D57 (Sps Technologies, Llc Dba PB Fasteners), MB84-8D57 (Hi-Shear Corporation), ST3M571-8D57 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M571-8D57 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), ST3M571-8D57 (Fastener Innovation Technology, Inc. Dba F I T) and 12 more.
Key specifications for MB84-8D57: Extended Washer Thickness: 0.113 INCHES MINIMUM AND 0.133 INCHES MAXIMUM IN; Head Height: 0.494 INCHES MINIMUM AND 0.514 INCHES MAXIMUM IN; Fastener Length: 4.315 INCHES MINIMUM AND 4.345 INCHES MAXIMUM IN; Extended Washer Diameter: 0.818 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN. 20 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.