Cleveland 14357 5/8" Cobalt TiN 135° Jobber Drill Bit

5/8" Cobalt TiN Jobber Drill Bit

This Cleveland drill bit is a fractional-inch cutting tool sized at .6250 decimal equivalent. It is designed for machine-shop use where a straight-shank jobber-length bit is required. The cobalt steel construction suits harder workpiece materials. Buyers needing a smaller diameter or a reduced-shank bit for a three-jaw chuck capacity below .6250 will need a different tool.

Straight Shank and 135° Point for Machine Setup

The straight shank fits directly into a collet or drill-press chuck without an adapter. The 135-degree split point is intended to reduce walk on contact and lower thrust force. Common issues include chatter if the workpiece is not rigidly clamped and premature wear if cutting fluid is omitted when drilling stainless or high-alloy steels.

Cobalt Steel Holds Edge Under Sustained Drilling

Cobalt alloy retains hardness at the temperatures reached during extended drilling cycles better than standard high-speed steel. The TiN coating further reduces friction and heat buildup at the cutting lips. In continuous production runs the bit maintains hole size and finish longer than uncoated alternatives, though re-sharpening will eventually be required.