Excellent Transmission Efficiency of Tightening Torque
Since the hexalobular socket transmits the force of the tool at 15 degrees, the tightening torque is transmitted more efficiently. Diagram 1 Since a hexagonal socket transmits the force of the tool at 60 degrees, the force of the tightening torque is spread outward, which generates loss.
Reducing the Risk of Breakage of Tools and Screw Heads
With hexalobular sockets, the surface of the tool makes contact. This means the stress is not concentrated, which reduces the risk of breakage of tools and screw heads. With hexagonal sockets, the angled portion of the tool only makes contact, which increases the tightening torque. This concentrates the stress on the angle portion of the tool and may break the tool or the hexagonal socket of the screw head.
No Cam Out
With cross recessed screws, the tool such as a screwdriver may rise up unless it press down the screw when tightening. This phenomenon is called as cam out. If cam out occurs, the engagement of the cross recess and tool is reduced, which causes damage to tools and screw heads. With hexalobular sockets, cam outs do not occur, which can make tightening safe and reliable.
＊The hexalobular shape is prescribed by JIS B 1015: 2008 (ISO 10664:2005) "Hexalobular internal driving feature for bolts and screws".