List of screw drives(螺丝刀型号)/附 PHILLIP 螺丝头规格 A screw drive is the system used to turn a screw.[1] At a minimum, it is a feature on the screw that allows for it to be turned. Usually it also involves a mating tool, such as a screwdriver, that is used to turn it. The following heads are categorized based on commonality, with the less common drives being classified as "tamper-resistant". Most heads come in a range of sizes. [edit]Common types [edit]External types All of these screw drives are characterized by a female tool and a male fastener. [edit]Square A square screw drive uses square shaped fastener heads. They can be turned with a crescent-type wrench, open-end wrench, or 8- or 12-point[2] sockets. Extremely common in the 19th and early 20th centuries. Less common today because the hex has largely displaced it. It is still widely used on theatrical lighting equipment. [edit]Hex A hex screw drive uses six-sided fastener heads. The fastener is known as a hex head cap screw. They can be turned with a crescent-type wrench, combination wrench, or 6 and 12-point sockets. Better than square for locations where surrounding obstacles limit wrenching access, because smaller wrench-swing arcs can be successful. [edit]Pentagon A pentagon screw drive uses five-sided fastener heads. The fastener is known as a penta screw. They require a special five-point socket in order to be turned. Water meter covers, natural gas valves, and electrical cabinets are commonly secured with penta fasteners. It is also common in the U.S. for fire hydrants to have valves with a pentagon drive. [edit]Slotted types [edit]Slot Slot drive tool and fastener sizes[3]Blade width Fastener size 3⁄32 in (2.4 mm) 0– 1 1...
