M3 M4 Stainless steel Hex Flange Self Tapping Screws SS304 SS316 A2 A4-80 Drilling screws

M3 M4 Stainless steel Hex Flange Self Tapping Screws SS304 SS316 A2 A4-80 Drilling screws

Product Description:

There are two types of self-tapping screws: round head and flat head.1 They require a pilot hole to be drilled into the material that is slightly smaller than the diameter of the screw before a screwdriver is used to screw the screw into the material. Self-tapping screws with a pointed head do not require a pilot hole. Self-tapping threaded screws are suitable for fixing materials such as wood, plastic, metal and brick. Self-tapping screws can also be classified as self-tapping locking screws, wall panel self-tapping screws, self-drilling self-tapping screws, general self-tapping screws, etc., depending on their use.

Features
Although there are many types of self-tapping screws, they all have the following common points:
(1) They are generally manufactured from carburised steel (99% of total production). They can also be manufactured from stainless steel or non-ferrous metals.
(2) The product must be heat-treated. Carbon steel self-tapping screws must be carburised, and stainless steel self-tapping screws must be solution-hardened. In order to make the self-tapping screws to achieve the mechanical properties and use of the performance required by the standard.
(3) high surface hardness, good core toughness. That is, ‘soft and rigid’. This is a major feature of the performance requirements of self-tapping screws. If the surface hardness is low, it is not screwed into the matrix; if the core toughness is poor, a screw on the break, can not be used. So ‘soft outside steel’ is to meet the performance of self-tapping screws, very important requirements.
(4) The surface of the product requires surface protection treatment, generally plating treatment. Some of the product surface shall be treated with phosphate (phosphating), such as wallboard tapping screws are mostly phosphated.
(5) Cold heading process is adopted. Recommended high-speed cold heading machine and high-speed thread rolling machine or high-speed planetary thread rolling machine production. High speed is emphasised here to ensure product quality. Only high-speed machine production of self-tapping screw head forming good, high thread quality.

Applications

U-bolt heat tightening is suitable for what occasions

Thermal tightening is the internal control of the medium temperature requirements of the pipeline bolts, in addition to the construction of the fastening, the need to reach a constant temperature or different temperatures in a process of work and then the fastening. And in normal use, the temperature rises, the bolt is subjected to thermal expansion, the gap increases, the need to complete the sealing from zero by hot tightening operation....

In general, the requirements of the internal temperature > 200 ℃ in the equipment, pipelines, etc., need to bolt fastening heat tightening.

Hebei Wanxin Fastener Manufacturing Co., Ltd, the main production of products are: U bolts, steel bolts, ground bolts, flange, double-headed bolts, highways, railways, underground supporting fasteners, a variety of pre-embedded parts, high-strength bolts, high-strength hexagon, scaffolding, through the wire water-stop screws, high-strength nuts, through the wall wire reinforcing stirrups,, step by step, the top bracket, butyl threads, water-stopping steel plate and so on.

There are two main ways to judge the hardness of steel, which are Brinell hardness in HB and Rockwell hardness. Firstly, from the Brinell hardness, will be a hardness higher than the measured steel ball to the steel above, and apply a force F, then the ball will be in the measured steel will leave a dent, measured, the area of M, then Rockwell Brinell hardness will be F/M. Next Rockwell hardness is also convenient to explain the only difference between the latter and the former Rockwell hardness measurements is the force to force to divide by the depth of the small ball plunged into the.

Steel can be improved by mixing it with alloys, for example by adding carbon, known as carbon steel, which increases its hardness and rigidity but decreases its toughness and plasticity. By adding chromium, the hardness and rigidity of steel can be increased with less effect on its toughness. By adding titanium, the hardness and toughness of steel is increased.

The properties of steel can vary after different types of processing, with a focus on quenching and tempering, two of the earliest forms of steel processing that I learnt about as a child, both of which I learnt about through the game Ride and Slash. Firstly, quenching is the process of heating steel to over 723 degrees and then soaking it in water for a rapid cool down to increase the hardness and decrease the malleability of the steel. Tempering means heating the steel to over 723 degrees and then cooling it slowly to increase its strength and toughness at the same time.

About Us






Package