Self-tapping screw sleeve (302 slotted self-tapping screw sleeve, 307/308 three-hole self-tapping screw sleeve, DIN7965 series internal and external tooth screw sleeve)
Self-tapping screw sleeve is a new type of special fastener to strengthen thread strength. The whole product has inner and outer teeth, which are embedded in soft materials such as plastic, aluminum alloy, cast iron, copper, etc.
Forming higher strength internal threaded holes. The self-tapping screw sleeve does not need to tapping the screw teeth in advance, but can be directly screwed into the base metal by manual tools or electropneumatic tools to form a thread surface, which is right
The thread with broken teeth can also maintain the original size, which is in line with the principle of economy. For new products, the thread strength can be increased to prevent the screw from loosening, i.e. The product grade can be improved.
First, the advantages of self-tapping screw sleeve:
(1) A threaded insert that is embedded into the base metal after the self-tapping screw sleeve is formed.
(2) The self-tapping screw sleeve does not need taps, and can tapping threads by itself, thus reducing working hours and costs.
(3) The self-tapping screw sleeve has its own reinforced thread, which has a large contact area with the finished product and strong tensile force. Lower strength materials can be used in product design.
(4) Protection of screw teeth: It has shock-proof effect and can prevent thread loosening.
(5) Regeneration of thread ulceration has maintenance effect on only thread after worn ulceration.
(6) Fast-pin rigid products (automatic screw bushing) after heat treatment and lead plating have good corrosion resistance.
(7) If the base metal contains bubbles, it also has good binding density.
(8) The self-tapping threaded bushing of the same specification can be applied to a variety of different materials and is in line with economic benefits.
(9) The installation is simple and rapid. As long as a loading tool is used, the cost is low and the defective rate is low.
(10) A variety of materials, types and specifications are available for selection and application.
Second, the classification of self-tapping screw sleeves:
(1) Slotted type, also known as type 302, with a cutting groove at the head of the screw sleeve to realize self-attack characteristics;
(2) Three-hole type, subdivision 307 type and 308 type, the head has three self-tapping holes to realize self-tapping characteristics, 308 is 307 reinforced type, and the two are only different in length;
(3) According to the material, it can be divided into three common kinds of brass, stainless steel, Carbon steel; The common surface treatment is galvanized (yellow zinc, blue-white zinc), galvanized nickel and so on
3. Installation Method of Self-tapping Screw Sleeve
The installation method of self-tapping screw sleeve-automatic installation tool is simply demonstrated by means of dynamic diagram.