Classification Of Small Metric Screws

Small metric screws are also called small screws, micro screws, tiny screws. It is mostly used in fine and small products such as glasses, mobile phones, watches, and earphone accessories. There are generally two types, one is a self-tapping precision screw, and the other is a machine-precision screw. The application of small metric screws is also very extensive. Generally, the small screws below M2 are called precision screws.

So what is the difference between self-tapping small metric screws and set precision screws?
Self-tapping precision screws generally refer to screw fasteners whose tips are self-tapping, thread with triangular thread, self-tapping tips, self-tapping flat end, etc. Most of the heads of small metric screws are flat, and there are some oval head precision screws, countersunk precision screws, raised countersunk precision screws, etc. These can be customized according to customer requirements. The precision small screws are mostly flat because the flat head screws can save a certain amount of space and reserve more teeth for the threads.

The biggest difference between the small metric screws of the machine wire and the self-tapping precision screw is the thread. Generally, the small metric screws of the machine wire is mechanically toothed. From the appearance, there is a big difference between the two, the tooth pitch of the precision screw of the wire is very uniform, and its screw shape. Screw head size, head shape, tolerance range, etc. The head of the precision screw of the machine wire includes the pan head machine screw, the countersunk head screw, the truss head screw, etc., which are mainly customized and produced according to the requirements of the customer.

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