The Bolt,shear, cataloged under National Stock Number 5306-01-256-5186, 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 22 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through both NSN and commercial part number lookups. 9 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-256-5186 |
| Primary Part Number | ST3M571-4H11 |
| 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 | 1.140 INCHES MINIMUM AND 1.170 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| 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 |
| Hole Configuration Style | DOUBLE HEXAGON LONGITUDINAL HOLE |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.677 INCHES MINIMUM AND 0.697 INCHES MAXIMUM IN |
| Width Between Flats | 0.303 INCHES MINIMUM AND 0.323 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 COMP XM-13 OVERALL |
| Hole Quantity | 4 |
| Thread Series Designator | UNF |
| Hole Type | DRILLED |
| Hole Diameter | 0.032 INCHES MINIMUM AND 0.042 INCHES MAXIMUM 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 |
|---|---|
| 74328-4H11 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VAL23033-4H11 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M571-4H11 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| AIC752-4H11 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB84-4H11 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M571-4H11 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| S11-1059-4H11 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M571-4H11 PRIMARY | The Boeing Company Div Defense (USA) |
| MB84-4H11 | Hi-Shear Corporation (USA) |
| ST3M571-4H11 | Devine Mfg Co (USA) |
| Reference | Meaning |
|---|---|
| ST3M571-4H11 | 5/9 Secondary reference Sps Technologies Inc |
| VS3060-4H11 | 5/9 Secondary reference U.S. Government activity |
| VS3060-4H11 | C/1 Advisory reference — outside the item-of-supply concept Howmet Global Fastening Systems Inc |
| S371-4H11 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| BM3326-4H11 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| S371-4H11 | 5/9 Secondary reference U.S. Government activity |
| ST3M571-4H11 | 5/9 Secondary reference Pruitt Energy Sources Inc |
| 74328-4H11 | 5/2 Secondary reference U.S. Government activity |
| BM3326-4H11 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-256-5186 is a Bolt,shear, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-256-5186 has 10 manufacturer part numbers on file: 74328-4H11 (Sps Technologies, Llc Dba PB Fasteners), VAL23033-4H11 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M571-4H11 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), AIC752-4H11 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB84-4H11 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc) and 5 more.
Key specifications for ST3M571-4H11: 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: 1.140 INCHES MINIMUM AND 1.170 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 22 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.