FIELD: machine building.
SUBSTANCE: head consists of periphery, centre and three convex sections divided with first slit, second slit and third slit passing radially form centre. Each slit has lengthwise axis. According to the first version in the head between lengthwise axes of slits there is angle from 130 to 135 degrees between the first slit and the second slit and between the second slit and the third slit. Also angles between adjacent lengthwise axes are different. Other objects of the invention are screw drivers adapted for the said screws; also versions of complete sets of the said screw and screw driver ensuring high torque.
EFFECT: high torque and high velocity of rotation.
36 cl, 11 dwg
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