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1·Hexalobular socket countersunk head tapping screws.

沉头内六角攻丝螺钉。

2·Hexagon socket head cap screws with countersunk head screws like.

角紧顶螺钉固定在底座上。

3·Specification: flat head cold-flow model, countersunk head cold-flow model, primary drawing mould, pole-shorten model, etc.

规格：平头冷墩模、沉头冷墩模、一序冲顶模、缩杆模等。

4·Name two head styles of machine screws that are countersunk.

沉头机螺钉有哪两种头型？