Drill Bit Shank - Hex Shank

Hex Shank

The flats of a hex shank can either be machined on a round shank, as in the photograph, or can be the natural flats of hex bar stock. A hex shank can be grasped by a 3-jaw drill chuck, or can be held in a custom chuck specifically for hex shanks. 1/4 inch hex shanks are common for machine screwdriver bits, and have spread from that application to be used for drill bits that are compatible with screwdriver machinery.

• Zero manufacturing if the drill bit is made from hex bar stock
• Can be held in a drill chuck made for cylindrical shanks
• Can be held in a hex screwdriver bit chuck
• High torque transmission, limited only by strength
• No need to tighten, shape does not allow slipping
• Moderately accurate centring
• Cannot be held in a collet