Screwdriver Sizes: Phillips, Slotted, Torx and More
Quick answer: match the driver profile and size to the fastener recess. A Phillips tip is not the same as Pozidriv, and internal Torx (T) sizes are not external Torx (E) socket sizes. The tip should seat fully with little side play.
Common Screwdriver Drive Types
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Phillips Driver Fit Guide
Phillips size labels identify the driver tip, but they do not provide a universal screw-gauge conversion. Fastener head dimensions vary, so use the manufacturer’s specification when available and confirm fit before applying torque.
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How to Avoid Stripping a Fastener
- Use the exact drive profile called for by the fastener.
- Choose a tip that seats fully and does not rock in the recess.
- Keep the driver aligned with the fastener and apply steady axial pressure.
- Replace worn bits; stop if the tip cams out or damages the recess.
Related references: Allen wrench size chart, external Torx size chart, and socket sizes in order.
Drive and Fit References
Wiha screw-drive profiles, Wiha Torx screw size chart, and RS guide to screwdriver types provide additional profile and fit information. Fastener-maker specifications take precedence for a particular screw.
