沉頭孔 規格表
2種規格資料
沉孔加工使螺栓頭或螺母與零件表面齊平。圓柱形沉孔用於內六角螺栓，錐形沉孔用於沉頭螺釘。沉孔深度=螺栓頭高度+0.5~1mm餘量。
常見問題 (FAQ)
What is the difference between a counterbore and a countersink?
A counterbore is a cylindrical recess for socket head cap screws to sit below the surface. A countersink is a conical recess (typically 90°) for flat-head bolts to sit flush. Both achieve a flush surface finish.
How is counterbore depth determined?
It must be at least the bolt head height. Typically bolt head height + 0.5–1mm clearance. KS/ISO spec tables list recommended counterbore diameter and depth for each bolt size.