The screw head is designed to fit a ratchet or spanner torque wrenches allowing you to tighten the screw to your exact specifications. hex head cap screws are typically used to create a bolted joint, in which a threaded shaft exactly fits a corresponding tapped hole or nut. grade 2 screws tend to be used in construction for joining wood components.
Din 931 / iso 4014 partially threaded hex cap screw. 8.8 grade bare steel / zinc plated; 8.8 grade hot dip galvanized (iso fit) 10.9 grade bare steel / yellow zinc plated; 10.9 grade bare steel with extended threads; 12.9 grade bare steel; a2/a4 stainless steel; din 933 / iso 4017 fully threaded hex cap screw. 8.8 grade bare steel / zinc plated
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