Self Tapping Srews

Haiyan Jinrun Metal Products Co., Ltd. is a supplier of self-tapping nails. Our mainly Self Tapping Srews are: bugled head drywall screws, Double flat head chipboard screws, Phillips pan head  self tapping screws, phillips  flat head self tapping screw, truss  head self tapping screw, pan framing head self tapping screw, hex Washer head  self tapping screw, hex flange head self tapping screw screw, etc., these are also our company's main products, product quality is good, the price is cheap, you can wholesale self tapping screw, or retail, because there are some products in stock.

Each Self Tapping Srew is composed of three parts: the head, the thread and the end of the thread. The composition of each Self Tapping Srew has four major elements: head shape, screw mode, thread type, and end form.

1. Head shape

The head has a variety of shapes. There are round head (half round head), oblate head, round head flange (with pad), oblate head flange (with pad), pan head, pan head flange (with pad), countersunk head, semi-countersunk head, cylindrical head, spherical cylinder head, horn head, hexagonal head, hexagonal flange head, hexagonal flange (with pad) and so on.

2. Wrench method

The screw screw method refers to the way to twist the head of the screw when installing and fastening the screw. The basic methods are external screw screw and internal screw screw. In general, the external wrench allows more torque than any form of internal wrench (internal groove). External wrench: hex, hex flange, hex flange, hex flower, etc.; Internal screw: single slot, cross slot H type, cross slot Z type, cross slot F type, square slot, compound slot, internal spline, hex flower, inner triangle, hex, inner 12 Angle, clutch slot, six blade slot, high torque cross slot, etc.

3. Thread type

There are many kinds of threads, including self-tapping thread (wide tooth thread), machine thread (common thread), drywall screw thread, fiberboard screw thread, and some other special threads. In addition, the thread can be divided into single leads (single head), double leads (double head), multiple leads (multiple heads) and high and low teeth double head threads.

4. End form

The end forms are mainly cone end and end two. However, according to the needs of use, the end of the screwing part can be processed with cutting functions of trenches, slots, notches or parts similar to the shape of drill bits. In some standards, the same cone end or flat end, there are also different forms such as round head end.

Although there are many types of Self Tapping Srews, they all have the following in common:

(1) It is generally made of carburized steel (99% of the total output). It can also be made of stainless steel or non-ferrous metals.

(2) The product must be heat treated. Carbon steel Self Tapping Srews must be carburized, stainless steel self tapping screws must be solid solution hardening treatment. In order to make the self-tapping screw to meet the requirements of the standard mechanical properties and performance.

(3) The product surface hardness is high, the core toughness is good. "Soft inside but tough outside". This is a major feature of the performance requirements of self tapping screws. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. Therefore, the "internal soft steel" is a very important requirement for Self Tapping Srews to meet the performance.

(4) The surface of the product needs surface protection treatment, generally electroplating treatment. The surface of some products must be treated by phosphate (phosphating), such as the wall panel Self Tapping Srews are mostly phosphating.

(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of the Self Tapping Srews produced by the high-speed machine is well formed and the thread quality is high.

Self tapping screw materials can be divided into carbon steel and stainless steel, of which carbon steel materials are mainly 1022 carbon steel. Usually used on doors and Windows, iron sheets. Self tapping screw itself has a strong corrosion resistance, if coupled with rubber sealing ring, so that the screw regardless of exposure to outdoor, or relatively humid environment, can make the screw does not seep, do not rust.The pan  head and hex washer head tapping screws are suitable for the occasions where the screw head is allowed to be exposed. The hex washer head tapping screws bear greater torque than the disc head tapping screws. Flat  head and hex socket tapping screws are suitable for occasions where the screws head is not allowed to be exposed

The surface of self tapping screw is mainly galvanized, phosphating, hot rust treasure, dacromet, head paint and so on. Size specifications, surface, can be customized according to customer requirements.