<button id="qikji"></button>
      1. <li id="qikji"><tr id="qikji"></tr></li>

        1. <progress id="qikji"></progress>
        2. Welcome to Guangzhou Shengfeng Hardware Co.,Ltdwebsite!

          ?
          Hot Products
          Contact us
          Hotline
          020-34831869
          Address:No. 5, West Village, Shawan Town, Shawan Town, Panyu District, Guangzhou
          Location: > english > Tech support >
          Specification and functional text of fastener basic knowledge
          Auther: Pubdate:2018-05-08
          Fastener product basic knowledge (specification text)
          jzz
           
           
          1. The parameters to be specified for fasteners include: name (standard), specification, material, strength grade and surface treatment. Such as: DIN912, M4-0.7x8, SCM435, grade 12.9, blackening.
           
          1, name (standard): Note: for non standard screws, non-standard parts, drawings are required.
           
          For example, DIN912, the Chinese name is: inside six angle cylinder head screw, this is the name.
           
          But the most accurate way is to call the standard, because GB70 is also the same name; but the two standards are different in many respects.
           
          The world's larger impact standards are: German standards (DIN), international standards (ISO), Chinese national standards (GB), American standards (ANSI), and Japanese standards (JIS).
           
          2, specifications, general screw names are toothed address diameter * screw length.
           
          It is commonly used in the metric system: M2, M3, M4, M5, M6, M8, M10, M12, etc.
           
          Commonly used in the US system are: 4#-40, 6#-32, 8#-32, 10#-24, 1/4-20, 5/16-18, 3/8-16, 1/2-13 and so on.
           
          And the length of screws refers to the effective length of buried objects. For example, the length of the countersunk screw is loaded, the length of the half countersunk screw should be half the head, and the length of the head screw can not contain the head size. Such as:
           
          For specifications, it is best to add the tooth distance to the full name. For example, M4-0.7x8, 4 finger outer diameter is 4mm, 0.7 means the distance between two dental peaks is 0.7mm, and 8 refers to the effective length of embedded object is 8mm.
           
          In order to simplify and do not write tooth spacing, we use the crude teeth as the standard teeth, because they are most common, so they do not need to be labeled. This is the metric system.
           
          Here is a focus on the specifications of American screw, such as 6#-32*3/8, 6# is the tooth diameter, close to 3.5mm; 32 is 32 teeth per inch thread length (equivalent to the metric screw); 3/8 is the length of the screw (concrete screws).
           
          Here are 2 formulas to remember: outer diameter A#= (Ax0.013+0.06) x25.4 (mm), and 1 inch =25.4mm.
           
          2#=2.2mm, 4#=2.9mm, 6#=3.5mm, 8#4.2mm and 10#=4.8mm must memorize data. The number of screws corresponding to each specification should also be remembered: 2#-56, 4#-40, 6#-32, 8#-32, 10#-24, 1/4-20, 5/16-18, 3/8-16, and 1/2-13 (American Standard teeth).
           
          Note: the American UNC teeth are the standard teeth, and the UNF is the fine teeth. We defaults the rough teeth into the standard teeth.
           
          3, material: according to the most common materials are carbon steel, stainless steel, stainless steel, copper, aluminum and so on.
           
          Carbon steel is also divided into low carbon steel (such as C1008/C1010/C1015/C1018/C1022), medium carbon steel (such as C1035), high carbon steel (C1045/C1050), and alloy steel (SCM435/10B21/40Cr).
           
          General C1008 material is to play ordinary grade products, such as 4.8 level screws, common grade nuts; C1015 usually ring screw; C1018 generally do machine screws, of course, also have to do self tapping nails; C1022 is used to make self tapping nails; C1035 8.8 level screws; C1045/10B21/40Cr 10.9 level screws; 40Cr/SCM435 hits the 12.9 stage screw. Silk.
           
          Stainless steel has SS302/SS304/SS316 as the most common. Of course, a large number of SS201 products are now popular, even containing less nickel products, we call the non - authentic stainless steel products; the appearance looks like stainless steel, but the anticorrosion performance is quite different.
           
          4, strength grade: strength grade mainly refers to carbon steel fasteners.
           
          The common strength grades of carbon steel screws are 4.8, 5.8, 6.8, 8.8, 10.9 and 12.9. Nuts are correspondingly: 4, 6, 8, 10, 12.
           
          Generally, the screws below 8.8 levels are called ordinary screws, while those with grade 8.8 or above (including grade 8.8) are high-strength screws. The difference is that high strength screws need to be quenched and tempered.
           
          5, surface treatment: the surface treatment is mainly to increase the anti-corrosion performance, also some of the color, so mainly for carbon steel products, generally need to be surface treatment.
           
          Common surface treatments include blackening, zinc plating, copper plating, nickel plating, chrome plating, silver plating, gold plating, Dacromet, hot dip zinc and so on.
           
          There are many kinds of zinc plating, such as blue and white zinc, blue zinc, white zinc, yellow zinc, black zinc, green zinc and so on. At the same time, it is also environmentally friendly and not environmentally friendly. Each plating has a variety of coating thickness to meet the different salt spray test results.
          Fastener product basic knowledge (functional text)
           

          jzz
          Fastener product basic knowledge (specification text)
           
           
           
          1. The parameters to be specified for fasteners include: name (standard), specification, material, strength grade and surface treatment. Such as: DIN912, M4-0.7x8, SCM435, grade 12.9, blackening.
           
          1, name (standard): Note: for non standard screws, non-standard parts, drawings are required.
           
          For example, DIN912, the Chinese name is: inside six angle cylinder head screw, this is the name.
           
          But the most accurate way is to call the standard, because GB70 is also the same name; but the two standards are different in many respects.
           
          The world's larger impact standards are: German standards (DIN), international standards (ISO), Chinese national standards (GB), American standards (ANSI), and Japanese standards (JIS).
           
          2, specifications, general screw names are toothed address diameter * screw length.
           
          It is commonly used in the metric system: M2, M3, M4, M5, M6, M8, M10, M12, etc.
           
          Commonly used in the US system are: 4#-40, 6#-32, 8#-32, 10#-24, 1/4-20, 5/16-18, 3/8-16, 1/2-13 and so on.
           
          And the length of screws refers to the effective length of buried objects. For example, the length of the countersunk screw is loaded, the length of the half countersunk screw should be half the head, and the length of the head screw can not contain the head size. Such as:
           
          For specifications, it is best to add the tooth distance to the full name. For example, M4-0.7x8, 4 finger outer diameter is 4mm, 0.7 means the distance between two dental peaks is 0.7mm, and 8 refers to the effective length of embedded object is 8mm.
           
          In order to simplify and do not write tooth spacing, we use the crude teeth as the standard teeth, because they are most common, so they do not need to be labeled. This is the metric system.
           
          Here is a focus on the specifications of American screw, such as 6#-32*3/8, 6# is the tooth diameter, close to 3.5mm; 32 is 32 teeth per inch thread length (equivalent to the metric screw); 3/8 is the length of the screw (concrete screws).
           
          Here are 2 formulas to remember: outer diameter A#= (Ax0.013+0.06) x25.4 (mm), and 1 inch =25.4mm.
           
          2#=2.2mm, 4#=2.9mm, 6#=3.5mm, 8#4.2mm and 10#=4.8mm must memorize data. The number of screws corresponding to each specification should also be remembered: 2#-56, 4#-40, 6#-32, 8#-32, 10#-24, 1/4-20, 5/16-18, 3/8-16, and 1/2-13 (American Standard teeth).
           
          Note: the American UNC teeth are the standard teeth, and the UNF is the fine teeth. We defaults the rough teeth into the standard teeth.
           
          3, material: according to the most common materials are carbon steel, stainless steel, stainless steel, copper, aluminum and so on.
           
          Carbon steel is also divided into low carbon steel (such as C1008/C1010/C1015/C1018/C1022), medium carbon steel (such as C1035), high carbon steel (C1045/C1050), and alloy steel (SCM435/10B21/40Cr).
           
          General C1008 material is to play ordinary grade products, such as 4.8 level screws, common grade nuts; C1015 usually ring screw; C1018 generally do machine screws, of course, also have to do self tapping nails; C1022 is used to make self tapping nails; C1035 8.8 level screws; C1045/10B21/40Cr 10.9 level screws; 40Cr/SCM435 hits the 12.9 stage screw. Silk.
           
          Stainless steel has SS302/SS304/SS316 as the most common. Of course, a large number of SS201 products are now popular, even containing less nickel products, we call the non - authentic stainless steel products; the appearance looks like stainless steel, but the anticorrosion performance is quite different.
           
          4, strength grade: strength grade mainly refers to carbon steel fasteners.
           
          The common strength grades of carbon steel screws are 4.8, 5.8, 6.8, 8.8, 10.9 and 12.9. Nuts are correspondingly: 4, 6, 8, 10, 12.
           
          Generally, the screws below 8.8 levels are called ordinary screws, while those with grade 8.8 or above (including grade 8.8) are high-strength screws. The difference is that high strength screws need to be quenched and tempered.
           
          5, surface treatment: the surface treatment is mainly to increase the anti-corrosion performance, also some of the color, so mainly for carbon steel products, generally need to be surface treatment.
           
          Common surface treatments include blackening, zinc plating, copper plating, nickel plating, chrome plating, silver plating, gold plating, Dacromet, hot dip zinc and so on.
           
          There are many kinds of zinc plating, such as blue and white zinc, blue zinc, white zinc, yellow zinc, black zinc, green zinc and so on. At the same time, it is also environmentally friendly and not environmentally friendly. Each plating has a variety of coating thickness to meet the different salt spray test results.
          Fastener product basic knowledge (functional text)
           
           

          ? 操逼电影欧美精品,亚洲欧美韩A∨高清,亚洲欧洲另视频_第一页
          <button id="qikji"></button>
            1. <li id="qikji"><tr id="qikji"></tr></li>

              1. <progress id="qikji"></progress>