The Bolt,shear, cataloged under National Stock Number 5306-00-562-2809, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 12 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-562-2809 |
| Primary Part Number | ST3M571-4D18 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN |
| Head Height | 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN |
| Fastener Length | 1.578 INCHES MINIMUM AND 1.608 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 |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 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 |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.386 INCHES MINIMUM AND 1.426 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 |
|---|---|
| ST3M571-4D18 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| BM3326-4D18 | Huck International, Inc (USA) |
| MB84-4D18 | Hi-Shear Corporation (USA) |
| MB84-4D18 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| AIC752-4D18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| GS1030-4D18 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| VS3060-4D18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M571-4D18 PRIMARY | The Boeing Company Div Defense (USA) |
| S11-1059-4D18 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| 74328-4D18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VAL23033-4D18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-4D1897 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| BM3326-4D18 | 5/9 Secondary reference U.S. Government activity |
| VS3060-4D18 | 5/9 Secondary reference U.S. Government activity |
| 74328-4D18 | 5/2 Secondary reference U.S. Government activity |
| S371-4D18 | 5/9 Secondary reference U.S. Government activity |
| HSS3060-4D18 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-00-562-2809 is a Bolt,shear, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-562-2809 has 12 manufacturer part numbers on file: ST3M571-4D18 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), BM3326-4D18 (Huck International, Inc), MB84-4D18 (Hi-Shear Corporation), MB84-4D18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), AIC752-4D18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 7 more.
Key specifications for ST3M571-4D18: Extended Washer Thickness: 0.059 INCHES MINIMUM AND 0.079 INCHES MAXIMUM IN; Head Height: 0.290 INCHES MINIMUM AND 0.310 INCHES MAXIMUM IN; Fastener Length: 1.578 INCHES MINIMUM AND 1.608 INCHES MAXIMUM IN; Extended Washer Diameter: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN. 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.