Interal Threaded Cylindrical (Dowel) Pin are for easy extraction, from blind holes. They are manufactured in soft condition (Type G) from C-40 material. Hardened Pins (Type F) are manufactured from case hardened alloy steel or as per buyers requirement. Air Vent may be Provided

Taper Pins are preferred for parts which have to be taken apart frequently and when driving out the Cylindrical Pins, would tend to wear the holes and also to very accurate constructed tools and gauges which have to be kept in absolute alignment.