Star Drive Truss Head Machine Screws feature an over-sized and undercut domed head with a Star Drive, also referred to as 6 Lobe. Star drive machine screws are often used with nuts as well as driven into tapped holes. Machine screws are most commonly found in smaller sizes.
Star Drive Screws are designed so the driver will not slip out of the fastener as a Phillips drive might, since the driver is not inherently centered on the fastener. A benefit/disadvantage of non-typical fasteners is that it can be more difficult for users of a device to disassemble it than if more-common head types were used. The star, or 6 Lobe Drive reduces the chance of fastener stripping, allowing for a higher torque installation.
The over-sized head of the screw with undercut bottom have given it the name mushroom head screw. The larger screw head is used to distribute pressure along a greater surface area which, in turn, can help to prevent accidental loosening of the screw.
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