Dictionary Definition:
A tool used for turning screws.
- Never use a screwdriver as a leverage tool.
- Never use a screwdriver as a punch tool, being struck with a hammer. Using a screwdriver as a chisel or punch may cause the tip to break and fly, hitting the user or other person.
- Use the correct size tip for the size of screw head and if the screwdriver tip has rounded edges, redress with a file. This will help prevent the tool from slipping. If the tip is too wide it will scar the workpiece around the screwhead.
- Don't use a screwdriver near a live wire or for electrical testing unless fully insulated or made for that purpose. Even when using an insulated screwdriver for electrical work, always disconnect the current before working.
- Never expose a screwdriver to excessive heat.
- Always drill a pilot hole when driving screws. The wood will split if you drive a screw too close to the end of the workpiece without drilling a pilot hole.
- A little wax/candle grease/soap on the thread of a screw will help the screw turn easily.
Choosing a Screwdriver
- Handle - A moulded plastic/shaped handle such as High Grip or cabinet pattern are ideal for woodscrews and high torque usage.
- Blade Length - Use the longest blade convenient for the work being carried out. More power can be applied to a long screwdriver because a longer screwdriver has a larger handle.
- Tip Type
- Use a flared tip for normal and heavy duty work.
- Use a parallel tip for lighter work, where the screwdriver is hidden below the surface of the workpiece, eg. counterbore, and contact screws in plugs, switches etc.
- Only use Phillips/Crosspoint screwdriver on Phillips screws, or Pozidriv/Supadriv screwdrivers on pozidriv/supadriv screws.
| Screw Size | 3-4 | 5-10 | 12-14 | 16+ |
| Tip No. | 1 | 2 | 3 | 4 |
No. 0 tip is also available for small electrical component screws.


