Profile: Panama Engineering Enterprise manufactures pins according to various standards. Our products include grooved pins, cylindrical (dowel) pins, taper pins, internal threaded cylindrical (dowel) pins, and internal & external threaded taper pins. We are an ISO 9001 certified company. Grooved pins are parallel pins with three equi-spaced longitudinal grooves. They are rolled or pressed into the cylindrical body to deform the pin stock outward within controlled limits. When this pin is forced into a drilled hole of proper diameter, a locking fit is obtained.