Self-Drilling Anchor bolt (SDA) are full threaded hollow rock bolts which used in the drill string during drilling of a support hole, and grouted into the hole.
Stainless steel hexagon head bolts are divided into iron and stainless steel bolts. The producible grades of iron are 4.8 grade bolts and 8.8 grade bolts.
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Structure:The fuse is made of copper, silver, etc., and the melt is enclosed in a square tube made of ceramic. The melting tube is filled with quartz sand as an arc extinguishing medium.After the fuse protection circuit, the side indicator is different fr