Understanding Different Types of Screwdriver Bits and Their Uses

Screwdriver bits are small but essential tools that fit into power drivers or manual screwdrivers to drive different types of screws. Knowing  tool reviews  for the job can save time, prevent damage to screws, and make your work more efficient. There are many types of screwdriver bits, each designed for specific screw head shapes and applications.

The most common bit is the flathead or slotted bit. It has a single straight edge and is used with screws that have a single slot in the head. While simple, flathead screws are prone to slipping, especially under high torque, so they are mostly found in older or low torque applications like furniture or basic electronics.

The Phillips bit is probably the most widely used bit today. It has a cross shaped tip that fits into a Phillips screw head. The design allows for better torque transfer than flathead and is self centering, making it easier to use. Phillips bits come in sizes from p1 to p4, with p2 being the most common for general household use.

Another popular type is the pzn or pozidriv bit. It looks similar to Phillips but has additional small lines at 45 degrees between the arms of the cross. This design reduces cam out, which is when the bit slips out of the screw head under pressure. Pozidriv bits are common in automotive and construction work where higher torque is needed.

Torx bits have a star shaped tip and are used with Torx screws. These are popular in electronics, bicycles, and automotive applications because they allow for high torque without damaging the screw head. Torx bits are labeled with a T followed by a number, like T10 or T25, and the size you need depends on the screw.

Hex bits, also known as Allen bits, are six sided and used with hex socket screws. These are common in furniture assembly, machinery, and bicycles. Hex bits come in both inch and metric sizes and can be used with a manual driver or a power tool.

Robertson bits, also called square drive bits, have a square tip that fits into a square recess in the screw head. They are popular in Canada and gaining ground elsewhere because they are very resistant to cam out and allow for one handed use. Robertson bits are labeled with sizes like s1 s2 or s3.

There are also specialty bits like tri wing, pentalobe, and spanner. Tri wing bits are used in some electronics and appliances and have a three winged tip. Pentalobe bits, shaped like a five pointed star, are often used in Apple products. Spanner bits have two small pins and are used in security applications like public restrooms or vending machines.

Always match the bit size exactly to the screw head. Using a bit that is too large or too small can strip the screw and make removal difficult. Keep your bits clean and store them properly to maintain their shape and effectiveness. Having a full set of bits on hand ensures you are ready for any job, whether it is assembling furniture, fixing electronics, or working on your car.