High strength hexagon socket bolts refer to grade 8.8 or above, including grade 10.9 and 12.9. Grade 12.9 socket head bolts generally refer to knurled, natural color black socket head screws with oil.
High strength screw cylindrical cup head hexagon socket bolt DIN912 blackened galvanized countersunk head flat head cylindrical head knurled screw
Purpose:
Similar to countersunk head screws, the head of the screw is embedded in the machine part, and the connection strength is large, but the screw must be installed and removed with an Allen wrench of the corresponding specification. It is generally used on various machine tools and their accessories.
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