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.
(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.

See also Machine Screw Head Styles

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