Easily operated threaded fastener has a hexagonal head with rounded corners and with three sides profiled for improved grip

摘要

An easily operated threaded fastener, e.g. a nut or screw, has a hexagonal head (12) with the corners rounded (122) and with three non adjacent sides having two profile ridges (123). The operating tool has a corresponding shape, i.e. with a hexagonal socket with rounded corners and with corresponding double grooves on three non adjacent sides.