Self tapping screw
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.
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.
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 | |
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 |
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. 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 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 | |
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 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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