Countersunk hole: The Larger hole is drilled at an angle,ideally to match the tapered angle of the fastener.Please mark the size of larger holes and smaller holes on the drawing.
Counterbored hole:The Larger hole is drilled straight into the material at a shallower depth than the smaller inner shaft. this leaves a flat bottom for the fastener to rest on. Please mark the size of larger hole and smaller holes on the drawing, also the counterbored depth.
