Drive Types for Machine Screws

Schematic	Drive Type	Uses
	Phillips	Most recommended drive type. Provides good control in driving. Always use a driver bit of the proper size which is in good condition.
	Slotted	Accepts standard blade screwdriver. Requires less downward pressure to drive parts than those with cross-recessed openings. Use proper fitting blade to minimize slippage.
	Combination (Slotted & Phillips)	Accepts phillips and standard blade screwdrivers. Often used when fastener is expected to be driven and backed out several times.
	Hex / Slotted-Hex	Accepts hex wrench. Slotted drive is added to make it easier to remove the fastener.
	Torx®	Positive-engaging, fast-locating method of transmitting torque and optimizing worker efficiency. Good fastening appearance.
	Square	Increases productivity with excellent torque transmission and resists cam-out. Distinctive appearance which discourages tinkering.
	Pozidrive® - Alternative (Type 1A)	This design offers greater control in driving than Phillips drive. Quite common in appliance and automotive manufacturing.