Specifications
| Material | High-tensile alloy steel |
| Grade | Grade 8.8 |
| Drive / head | Hex socket (Allen) |
| Diameters | 3/8" to 1" (M10–M24) |
| Lengths | 1" to 6" |
| Thread | Coarse |
| Finish | Black oxide / zinc |
Description
Grade 8.8 Hex Cap Screw — Grade 8.8 hex socket (allen) for machinery, tooling, dies and high-strength assembly. Stocked across common sizes and lengths.
The Grade 8.8 hex cap screw is a metric high-tensile bolt, the most widely used high-strength metric fastener in machinery and general engineering. Grade 8.8 offers a well-proven balance of strength and ductility for machine assembly, equipment mounting and structural fastening on metric-specified projects. It is the metric counterpart to the imperial high-strength bolts, and the default choice wherever drawings call out metric high-tensile fasteners.
Grade 8.8 cap screws are supplied in a range of metric diameters and lengths, with matching grade nuts. Matching the bolt grade to the design load prevents the failures that come from under-specifying a fastener. Confirm the metric sizes available in the specifications below.
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