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    The three connection fastener

    1, fasteners permanent.
    The fastener that the connection parts are not separate, such as riveting and welding.
    2, semi permanent type fastener.
    The adoption of such a fastener connected parts can be disassembled, but usually will cause damage to the fastening the parts, such as the cotter pin.
    Detachable 3, fasteners.
    By coupling this firmware mode components is easy to be apart. For example, the ordinary bolt and nut connecting.