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Self tapping screw
Auther: Pubdate:2018-09-18
 
Self tapping screw
Self-drilling screw also called tapping braces, tapping bushing.
Tapping inside and outside has a screw thread, is a kind of strengthen the strength of screw thread fasteners.Self-drilling screw embedded in aluminum alloy, plastic, iron, copper and other soft materials, high strength internal thread hole can be formed, at the same time can also to repair to bad internal thread.
Stainless steel tapping braces
At left is a stainless steel self-drilling screw
Specification: M8 * 14 * M5 (internal thread M5, external thread M8, length 8 mm)
Material: stainless steel SUS304
Surface treatment: wash light and color
Stainless steel self-tapping screw with extra strong corrosion resistant specifications, used in damp environment protection threaded hole will not embroider to death.
Self-drilling screw set of drawings and specifications
302 self-drilling screw drawing:

Of the specifications of the type 302 self-drilling screw parameter, in MM
Type 302 (slot) The length L External thread D Refer to the hole diameter The smallest hole depth
The metric system The imperial Plastic class Aluminum alloy Cast iron
M2-0.4   6 M4.5-0.5 4.0 to 4.1 4.1 to 4.2 4.2 to 4.3 8
M2.5-0.45 # 2-56 6 M4.5-0.5 4.0 to 4.1 4.1 to 4.2 4.2 to 4.3 8
M3-0.5 # 4-40 6 M5-0.5 4.5 to 4.6 4.6 to 4.7 4.7 to 4.8 8
M4-0.7 # 8-32 8 M6.5-0.75 5.8 to 5.9 6.0 to 6.1 6.1 to 6.2 10
M5-0.8 # 10-24 10 M8-1.0 7.1 to 7.2 7.3 to 7.5 7.5 to 7.6 13
M6a-1.0   12 M9-1.0 8.1 to 8.2 8.3 to 8.5 8.5 to 8.6 15
M6-1.0 A quarter - 20 14 M10-1.5 9.0 to 9.2 9.2 to 9.3 9.3 to 9.4 17
M8-1.25 5/16-18 15 M12-1.5 10.6 to 10.8 11-11.2 11.2 to 11.4 18
M10-1.5 3/8-16 18 M14-1.5 12.6 to 12.8 13.0 to 13.3 13.2 to 13.4 22
M12-1.75 7/6-14 22 M16-1.5 14.6 to 14.8 15.0 to 15.3 15.2 to 15.4 26
M14-2.0 13 1/2 - 24 M18-1.5 16.6 to 16.8 17.0 to 17.3 17.2 to 17.5 28
M16-2.0 5/8-11 22 M20-1.5 18.6 to 18.8 19.0 to 19.3 19.2 to 19.5 27
M18-2.5   24 M22-1.5 20.6 to 20.8 21.0 to 21.3 21.2 to 21.5 29
M20-2.5   27 M26-1.5 24.6 to 24.8 25.0 to 25.3 25.2 to 25.2 32
To note here is M6 has two types of specifications, their length, external thread and the hole diameter, hole depth is not the same, for tapping braces of M6 specification please in advance.
303 thin wall type slot of the specifications of the tapping screw parameter, in MM
Type 303 (thin wall groove type) The length of the External thread Refer to the hole diameter The smallest hole depth
M3-0.5 6 M4.5-0.5 4.2 to 4.3 8
M4-0.7 8 M6-0.7 5.6 to 5.7 8
M5-0.8 8 M7-0.8 6.6 to 6.7 10
M6-1.0 10 M8-1.0 7.5 to 7.6 13
M8-1.25 14 M10-1.25 9.2 to 9.4 15
307308 three groove of the specifications of the tapping screw parameter, in MM

The advantages of self tapping screw
1. Tapping has the ability to self tapping screw, a screw parent metal without a tapping beforehand, do not need to tap, self tapping screw, reduced working hours, and can reduce the cost
2. Protect teeth: shockproof effect, can prevent the loose thread.
Lives 3. The thread tooth regeneration: to have tooth abrasion, and crushing of the threads have repair effect, use the tapping screw thread may continue to use the original size of the screw.
4. Tapping braces excellent air-tightness and seismic resistance, can prevent looseness, improve concluded with the parent metal strength
5. Tapping braces and finished product contact area is large, withstand strong tension, product design can use the lower strength of materials.
6. If a parent metal containing bubbles, also has a good combination of density.
7. Tapping braces installation is simple, rapid, as long as a tool of loading, low cost and scrap rate
8. The same specifications of the tapping braces, can be applied to a variety of different materials, in line with the economic benefit.
The type of self tapping screw
Commonly used self-tapping screw from the appearance roughly divided into two types, one is the self-tapping screw slot type, another kind is the pass of the three circles, three circular groove is divided into 307 and 308 type two kinds, the difference between 307 and 308 under the same diameter, outside diameter and length is different.See the above specification parameter table.
The material of self-tapping screw
The product name The material used The element name and chemical composition
Carbon (C) Manganese (Mn) Silicon (SI) Phosphorus (P) Sulfur (S) Chromium (Cr) Nickel (Ni) Molybdenum (Mo)
Self tapping screw 1215 fast cutting steel 0.09 or less 0.75 to 1.05 0.10 or less 0.04 to 0.09 0.26 to 0.35 -- -- --
SUS303 stainless steel 0.15 or less 2.00 or less 1.00 or less 0.20 or less 0.15 or less 17-19 8-10 0.60 or less
SUS304 stainless steel 0.08 or less 2.00 or less 1.00 or less 0.045 or less 0.030 or less 18-20 8 to 11 --
SUS316 stainless steel 0.08 or less 2.00 or less 1.00 or less 0.045 or less 0.030 or less 16 to 18 10-14 2-3
To note here is that the stainless steel self-tapping screw our default SUS304, if you need SUS303 and 316, please inform us in advance.
Self-drilling screw installation method and points for attention
Installation method is very simple, is divided into two kinds
One: if installing a few in number, directly using the simplest installation method, with the self-tapping screw corresponding to the same specifications of the bolt and nut, as shown, the tapping on the corresponding models of bolt with a screw, with the same nut is fixed, to make the three as a whole, and then using a wrench to twisting a screw into the bottom hole, and then put the screw back, installation is complete.
Number 2: if the installation is very large, will use special tool to install, self tapping screw end of a set of installation tools for a hex head, (specific operation, please refer to the left) can be even manual tapping wrench, also can connect electric or pneumatic tools.
Installation note:
1. According to different material, reference hole size, for pre drilling.When the corresponding material is qualitative hardness is higher, please within the scope of the hole slightly enlarged the bottom hole.
2. The slot side will self-drilling screw down full install into the tool to the front, must be vertical contact artifacts.Load time (1 ~ 2 pitch) please make sure the bottom hole, absolutely cannot tilt.Found that tilt, please don't reverse tool and readjust the use again.When entering the 1/3 ~ 1/2, and not to come again, remember that please do not reverse rotation tool, otherwise it will cause the product failure.
Self-drilling screw set of USES
Self-drilling screw cash has been widely used in automobile industry, shipbuilding, rail cars, home appliances, construction machinery, office machinery, engineering plastics and advanced composite furniture, electronic products, and so on related industry.
 
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