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carriage screw​

May. 27, 2019 | 10:49:49
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Also called the carriage screw, the head is a round cap, the neck is square, with a special belt can be inserted into the four claws of the belt, the coal bucket can be fixed on the transmission belt, the material can be divided into Q235, 45# , Q345B, etc.

 carriage screw

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