The Bolt,shear, cataloged under National Stock Number 5306-00-294-9727, 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 10 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 10 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-294-9727 |
| Primary Part Number | ST3M571-8D40 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| 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 | 3.252 INCHES MINIMUM AND 3.282 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 |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.490 INCHES MINIMUM AND 2.510 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 CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 3.006 INCHES MINIMUM AND 3.046 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 |
|---|---|
| ST3M571-8D40 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M571-8D40 PRIMARY | The Boeing Company Div Defense (USA) |
| S371-8D40 | Huck International, Inc (USA) |
| 74328-8D40 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS1030-8D40 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| S11-1059-8D40 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M571-8D40 | Heartland Precision Fasteners Inc (USA) |
| ST3M5718D40 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| VS3060-8D40 | Howmet Global Fastening Systems Inc (USA) |
| BM3326-8D40 | Huck International, Inc (USA) |
| Reference | Meaning |
|---|---|
| MB84-8D40 | 5/9 Secondary reference Hi-Shear Corporation |
| AIC752-8D40 | 5/9 Secondary reference Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| BM3326-8D40 | 5/9 Secondary reference U.S. Government activity |
| MB84-8D40 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| VAL23033-8D40 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| ST3M571 | D/9 Drawing number reference only The Boeing Company Div Defense |
| VS3060-8D40 | 5/9 Secondary reference U.S. Government activity |
| S371-8D40 | 5/9 Secondary reference U.S. Government activity |
| 74328-8D40 | 5/9 Secondary reference Sps Technologies Inc |
| ST3M571-8D40 | 5/9 Secondary reference Twist Tite Mfg, Inc Dba Twist Tite Manufacturing Inc |
NSN 5306-00-294-9727 is a Bolt,shear, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-294-9727 has 10 manufacturer part numbers on file: ST3M571-8D40 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), ST3M571-8D40 (The Boeing Company Div Defense), S371-8D40 (Huck International, Inc), 74328-8D40 (Sps Technologies, Llc Dba PB Fasteners), GS1030-8D40 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace) and 5 more.
7 possible matches (shared part number, not a government interchangeability claim): 5306-00-630-4776, 5306-01-623-0098, 5306-01-623-1706. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M571-8D40: 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: 3.252 INCHES MINIMUM AND 3.282 INCHES MAXIMUM IN; Extended Washer Diameter: 0.818 INCHES MINIMUM AND 0.828 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.