The Bolt,shear, cataloged under National Stock Number 5306-00-285-9920, 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 17 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-00-285-9920 |
| Primary Part Number | ST3M571-4-9 |
| 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 | 1.015 INCHES MINIMUM AND 1.045 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 | 0.553 INCHES MINIMUM AND 0.573 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) |
| 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 |
|---|---|
| ST3M571-4-9 | Heartland Precision Fasteners Inc (USA) |
| 74328-4-9 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VAL23033-4-9 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-4-9 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M571-4-9 | Houston Precision Fasteners I Lp (USA) |
| AIC752-4-9 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M571-4-9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-4-9 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M571-4-9 | Saturn Fasteners Inc (USA) |
| PBF23T4-4P9 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-4-9 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M571-4-9 | Reid Products Inc. Dba Reid Products Inc (USA) |
| MB84-4-9 | Hi-Shear Corporation (USA) |
| S11-1059-4-9 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| MB84-4-9 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-4-9 | J M Precision Inc (USA) |
| GS1030-4-9 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| S371-4-9 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| ST3M571-4-9 | 5/2 Secondary reference U.S. Government activity |
| VS3060-4-9 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-4-9 | 5/2 Secondary reference U.S. Government activity |
| BM3326-4-9 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM3326-4-9 | 5/9 Secondary reference U.S. Government activity |
| S371-4-9 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-285-9920 is a Bolt,shear, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-285-9920 has 17 manufacturer part numbers on file: ST3M571-4-9 (Heartland Precision Fasteners Inc), 74328-4-9 (Sps Technologies, Llc Dba PB Fasteners), VAL23033-4-9 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M571-4-9 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), ST3M571-4-9 (Houston Precision Fasteners I Lp) and 12 more.
Key specifications for ST3M571-4-9: 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: 1.015 INCHES MINIMUM AND 1.045 INCHES MAXIMUM IN; Extended Washer Diameter: 0.428 INCHES MINIMUM AND 0.438 INCHES MAXIMUM IN. 17 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.