The Bolt,shear, cataloged under National Stock Number 5306-01-538-0303, 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 18 specifications, cited from the U.S. Government catalog. The record lists 13 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-538-0303 |
| Primary Part Number | ST3M571-3-66 |
| Item Name | Bolt,shear |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 0.054 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN |
| Head Height | 0.265 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN |
| Fastener Length | 0.694 INCHES MINIMUM AND 0.724 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.340 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN |
| Thread Length | 0.372 INCHES MINIMUM AND 0.422 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.302 INCHES MINIMUM AND 0.322 INCHES MAXIMUM IN |
| Width Between Flats | 0.243 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Grip Diameter | 0.1890 INCHES MINIMUM AND 0.1895 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 220000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP XM-13 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 |
|---|---|
| 74328-3-66 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| MB84-3-66 | Hi-Shear Corporation (USA) |
| BM3326-3-66 | Huck International, Inc (USA) |
| VAL23033-3-66 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-3-66 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M571-3-66 | Saturn Fasteners Inc (USA) |
| AIC752-3-66 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB84-3-66 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| S11-1059-3-66 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M571-3-66 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M571-3-66 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VS3060-3-66 | Howmet Global Fastening Systems Inc (USA) |
| GS1030-3-66 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| 74328-3-66 | 5/9 Secondary reference Sps Technologies Inc |
NSN 5306-01-538-0303 is a Bolt,shear, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-538-0303 has 13 manufacturer part numbers on file: 74328-3-66 (Sps Technologies, Llc Dba PB Fasteners), MB84-3-66 (Hi-Shear Corporation), BM3326-3-66 (Huck International, Inc), VAL23033-3-66 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M571-3-66 (Fastener Innovation Technology, Inc. Dba F I T) and 8 more.
Key specifications for ST3M571-3-66: Extended Washer Thickness: 0.054 INCHES MINIMUM AND 0.074 INCHES MAXIMUM IN; Head Height: 0.265 INCHES MINIMUM AND 0.285 INCHES MAXIMUM IN; Fastener Length: 0.694 INCHES MINIMUM AND 0.724 INCHES MAXIMUM IN; Extended Washer Diameter: 0.340 INCHES MINIMUM AND 0.350 INCHES MAXIMUM IN. 18 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.