• Cylindrical (dowel) pins are used for retaining parts in a fixed position or for preserving their alignment.
• Cylindrical hardened pins are manufactured as per IS: 6689, unhardened pins as per IS: 2393 and taper, pins as per IS: 6698 standards.
• These are suitable for parts that have to be taken apart frequently, in which case cylindrical pins would tend to wear the holes.
• Grooved pins have parallel equidistant longitudinal grooves impressed on their exterior surface and are manufactured to IS: 7368 standards; also manufactured are non-standard pins.