Cleveland C94570 Countersink 5/8 in 82° Cobalt

Countersink for 5/8 in holes

The Cleveland C94570 is a single-flute countersink cut from cobalt steel with an 82-degree included angle. It is sized for 5/8 inch holes and finished bright without coating. The tool suits machinists and maintenance crews who need clean chamfers in ferrous alloys.

Cobalt holds edge under heat

Cobalt alloy retains hardness at the temperatures generated by extended drilling in steel or stainless stock. The bright finish reduces galling and allows coolant to cling during long production runs. Chip evacuation stays consistent because the single flute clears swarf without packing.

Replaces worn high-speed steel bits

Shops that re-sharpen standard HSS countersinks multiple times per shift will see longer intervals between tool changes. The step up is justified when workpiece material work-hardens quickly or when batch sizes make frequent indexing costly. It is not for soft non-ferrous metals where uncoated HSS performs adequately.