MY SCREW DRIVERS

THESE are my basic screw drivers..
flat-bladed and cross-head screwdrivers otherwise known as the Phillip screw drivers. These tools vary in size and length and durability.

What is a Screw? What is a Screwdriver?

A screw is any shaft with a corkscrew-shaped groove formed on its surface. Screws are used to fasten two objects together. A screwdriver is a tool for driving (turning) screws; screwdrivers have a tip that fits into the head of a screw.

Phillips Head Screw

In the early 1930s, the Phillips head screw was invented by Henry Phillips. Automobile manufacturers now used car assembly lines. They needed screws that could take greater torque and could provide tighter fastenings. The Phillips head screw was compatible with the automated screwdrivers used in assembly line.

Types of Screw Drive

A variety of tools exist to drive screws into the material to be fixed. The hand-tool used to drive slot-headed and cross-headed screws is called a screwdriver. A power tool that does the same job is a power screwdriver. The hand-tool for driving cap screws and other types is called a spanner (UK usage) or wrench (US usage).

• Slot head is driven by a flat-bladed screwdriver.
• Cross-head, or Phillips screw has an X-shaped slot and is driven by a cross-head screwdriver, designed originally in the 1930s for use with mechanical screwing machines, intentionally made so the driver will ride out, or cam out, under strain to prevent over-tightening.
• Pozidriv is patented, similar to cross-head but with better resistance to slipping, or cam-out.
• Hexagonal or hex screw head has a hexagonal hole and is driven by a hexagonal wrench, sometimes called an Allen key, or a power tool with a hexagonal bit.
• Robertson drive head has a square hole and is driven by a special power-tool bit or screwdriver (this is a low-cost version of the hex head for domestic use).
• Torx head has a splined socket and receives a driver with a splined shaft.
• Tamper-proof torx is similar to torx but the drive socket has a projection to prevent a standard torx driver being inserted.
• Tri-Wing screws are used by Nintendo on its Gameboys. This discourages even minor home repairs to the units.