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  • Thread and threaded fittings

    Thread and threaded fittings

      Example 1 Is a thread with a tooth type of equilateral triangle, a nominal diameter of 36, and a pitch of 2 considered as a standard thread?Solution: According to the table of the given conditions, the thread whose profile is equilateral triangle and pitch is 2 is an ordinary thread...
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  • Pre-tightening and anti-loosening of threaded connections

    Pre-tightening and anti-loosening of threaded connections

    1. Pre-tightening of thread connectionBefore the action of the working load, the screw is subjected to the action of the pre-tightening force. 1. The purpose of pre-tightening 1) Increase the stiffness of the connection 2) Increase tightness 3) Improve the ability to keep loose  ...
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  • Fastener selection guide

    Fastener selection guide

    Fastener function introduction Fasteners are divided into threaded fasteners and non-threaded fasteners, non-threaded fasteners mainly refer to rivets, welded pins, connecting pins, etc., the engine in addition to the use of non-threaded fasteners, the vast majority are threaded fasteners. The s...
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  • Threaded connection design

    Threaded connection design

             4. Pre-tightening and anti-loosening of thread connection 1. Pre-tightening of thread connectionThread connection: loose connection — do not tighten when assembling, only when the external load is applied to the force — tighten when assembling, that is, when carrying, it...
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  • Thread type and detection

    Thread type and detection

        NPT thread is the American standard 60° taper pipe thread. The formula for calculating the warp of the thread is:The formula for the middle diameter of the thread is: D2=d2=D-0.8XPThe formula for thread path is: D1=d1=D-1.6XPThe fit mode of the thread is divided into cone...
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  • Basic knowledge of common gaskets

    Basic knowledge of common gaskets

      Non-metal tape Itscommonly used non-metallic materials are, such as flexible graphite (<600 ° C), polytetrafluoroethylene (-200~260 ° C), fiber reinforced rubber based composite board. Ribbon of Metal StrapsShape: V, W, wavy, etcMaterial: 0.15~0.25 low carbon steel, stainless steel, c...
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  • Standard Parts and Common Parts

    Standard Parts and Common Parts

    Standard parts and common parts Standard parts:The structure form, size, surface quality and representation method have been standardized. For example, threaded fasteners, keys, pins, rolling bearings and springs, etc. Standard parts are widely used and are produced by professional factories.Com...
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  • Why do fasteners come loose? Cause analysis of fastener torque attenuation

    Why do fasteners come loose? Cause analysis of fastener torque attenuation

          There are many factors affecting torque attenuation, for different forms of torque attenuation improvement measures are not the same, comprehensive above content, from the process and design point of view to consider the common improvement measures of torque atten...
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  • New breakthroughs in new energy vehicles! Is there a new opportunity for automotive fasteners?

    New breakthroughs in new energy vehicles! Is there a new opportunity for automotive fasteners?

    introduction In recent years, Chinese automotive brands have made significant progress in technological innovation and brand influence. One of the most eye-catching areas is new energy vehicles.   Nowadays, China has leapt to become the world’s largest new energy vehicle market, with ...
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