Cleveland C70251 Screw Machine Drill Bit 1/16 in Hss

Product Description

The CLEVELAND C70251 is a screw machine length drill bit designed for high-speed, close-tolerance drilling in metalworking and machining applications. Built from high-speed steel (HSS) with a bright, uncoated finish, it features a 135-degree split point that reduces walking and allows clean entry without a center punch. The 1/16-inch diameter and shortened screw machine length body provide rigidity for drilling in drill presses, CNC machines, and screw machine setups. The web-thinned, parallel web configuration improves chip clearance and reduces thrust load. This bit meets ASME B94.11M and NAS 907 Type C standards and is rated as a heavy-duty grade tool.

This bit is suited for production drilling in alloy steel, aluminum, and similar materials where tight tolerances and consistent hole quality are required. The 5/8-inch flute length and 1-5/8-inch overall length make it appropriate for shallow-hole work in screw machine, turret lathe, and short-run CNC drilling operations. The straight cylindrical shank seats directly into standard drill chucks and collet-style toolholders without modification.

Key Features

• 135-degree split point reduces thrust and eliminates center punch requirement
• Web-thinned parallel web improves chip evacuation and reduces heat buildup
• High-speed steel construction handles alloy steel and aluminum workpieces
• Screw machine length body provides added rigidity over jobber-length bits
• Bright uncoated finish allows easy visual inspection of cutting edge wear
• Meets ASME B94.11M and NAS 907 Type C standards

Compatibility

Designed as a screw machine length replacement drill bit for use in standard drill chucks and straight-shank collet toolholders across drill presses, turret lathes, and CNC drilling setups. Primary workpiece materials listed by the manufacturer include alloy steel and aluminum.

Installation Notes

Installation is performed by machinists and tool-and-die technicians. Secure the straight cylindrical shank firmly in a properly sized drill chuck or collet before operation. Ensure the spindle is stopped and de-energized before changing tooling. Use appropriate cutting fluid or coolant for the workpiece material even though this bit does not have through-coolant capability, as surface-applied fluid extends tool life.