Counterbore Hole Size for Socket Head

Amana #55232 COUNTERBORE SCREW SLOT BIT 12 Shank counterbore slot Counterbore Screw Slot Router Bit, In-Stock & Ready to Ship Today! Large selection of industrial quality Counterbore Screw Slot Router Bits counterbore slot Counterbore Cap from NIC AUTOTEC MISUMI offers free CAD downloads Plates for High Rigidity Type

slot ug So the length of each keyway slot is on a radius Each keyway also contains a stepped counterbore The full wide keyway drops down to before