Creating a six-lobe form in fasteners and other driven parts is ideal due to the high amount of contact between the tool and the part. The six-lobe form has many names. The most popular version is a trademarked type know as Torx®. However, additional varieties found in the marketplace are known generically as six-lobe, star, and hexalobular internal driving feature.
Rotary or wobble broaches can be made to any dimensions you will provide, but are typically only effective in machining smaller diameters and depths. The six lobe form is popular in sizes under 1/4″ diameter for screws in a variety of industries including aerospace, automotive, finished constrution, medical and plumbing. Many standards are published to standardize six lobe dimensions. For example, one industry standard is for inspecting the hexalobular driving feature. (ISO10664-2005) For more information, see ISO standards.
The rotary broach is designed to be used with a rotary broaching tool holder in any type of turning machine. Custom and standard six lobe hexalobular broaches are available from Polygon Solutions. More details are available at Torx Style Broach.