The Bolt,shear, cataloged under National Stock Number 5306-00-352-0457, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Heartland Precision Fasteners Inc. Government technical data includes 17 specifications, cited from the U.S. Government catalog. The record lists 15 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-352-0457 |
| Primary Part Number | ST3M571-4-4 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Heartland Precision Fasteners Inc |
| 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 | 0.703 INCHES MINIMUM AND 0.733 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 | 0.240 INCHES MINIMUM AND 0.260 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 |
|---|---|
| ST3M571-4-4 PRIMARY | Heartland Precision Fasteners Inc (USA) |
| 74328-4-4 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| BM3326-4-4 | Huck International, Inc (USA) |
| S11-1059-4-4 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| MB84-4-4 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| AIC752-4-4 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M571-4-4 PRIMARY | Hi-Shear Corporation (USA) |
| MB84-4-4 | Satair A/s (DNK) |
| ST3M571-4-4 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| S371-4-4 | Huck International, Inc (USA) |
| MB84-4-4 | Hi-Shear Corporation (USA) |
| ST3M571-4-4 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VAL23033-4-4 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| VS3060-4-4 | Howmet Global Fastening Systems Inc (USA) |
| VS3060-4-4 | Fairchild Fasteners Europe - Vsd Gmbh (DEU) |
| Reference | Meaning |
|---|---|
| VS3060-4-4 | 5/9 Secondary reference U.S. Government activity |
| BM3326-4-4 | 5/9 Secondary reference U.S. Government activity |
| 74328-4-4 | 3/2 Design control — primary reference U.S. Government activity |
| S371-4-4 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-4-4 | 5/9 Secondary reference Defense Support Services, Inc. |
| ST3M571-4-4 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-00-352-0457 is a Bolt,shear, manufactured by Heartland Precision Fasteners Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-352-0457 has 15 manufacturer part numbers on file: ST3M571-4-4 (Heartland Precision Fasteners Inc), 74328-4-4 (Sps Technologies, Llc Dba PB Fasteners), BM3326-4-4 (Huck International, Inc), S11-1059-4-4 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), MB84-4-4 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 10 more.
Key specifications for ST3M571-4-4: 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: 0.703 INCHES MINIMUM AND 0.733 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.