Detailed explanation of common screwdriver models

What are the commonly used models of screwdrivers? Generally speaking, the common screwdrivers are flat and cross. But there are more than two types of screwdrivers. But one thing is certain, screwdrivers do not have round heads, because round heads are not twisted at all. One word is to ensure that there is a twist, and the cross can make the force distribution more even.

Screwdrivers are divided into manual screwdrivers and electric screwdrivers according to the power source. According to the batch or cutter head, it is divided into FLATHEAD and PHILLIPS. There are many kinds of specifications and models. In the industry, they are basically based on batches. It comes in two sizes. One is the metric system, which is what we often call MM as the unit. There are also imperial systems, which are in inches, such as 1/4, 3/16, this number multiplied by 25 is the metric size.

1. The model of the flat-blade screwdriver is expressed as the width of the shank. For example, 375MM means that the width of the cutter head is 3MM and the rod length is 75MM (not full length).

2. The model of the Phillips screwdriver is expressed as the size of the bit and the shank. For example, 2#75MM, it means that the cutter head is No. 2, and the metal rod length is 75MM (not full length). Some manufacturers use PH2 to represent 2#, which is actually the same. You can roughly estimate the size of the cutter head by the thickness of the cutter shaft, but the industry distinguishes it by the size of the cutter head. The thickness of the metal rod corresponding to the model number 0#, 1#, 2#, 3# is roughly 3.0MM, 5.0MM, 6.0MM, 8.0MM.

The bit of a high-quality screwdriver is made of spring steel with relatively high hardness.

A good screwdriver should be hard but not brittle. When the screw head opening becomes bald and slippery, you can hit the screwdriver with a hammer to make the screw groove deeper, so that the screw can be easily unscrewed. The screwdriver should be undamaged; the screwdriver is often used to pry things, and it requires a certain degree of toughness. Not bend. In general, it is hoped that the hardness of the screwdriver head is greater than HRC60, and it is not easy to rust. Aluminum plate point.