Cleveland C70280 Drill Bit Letter a 135 Point Hss

Product Description

The CLEVELAND C70280 is a screw machine length drill bit sized at Letter A (0.2340 inches), designed for high-production drilling in metal fabrication and machining applications. Built from high-speed steel with a bright, uncoated finish, it features a 135-degree split point with web thinning for fast penetration and reduced walking on entry. The overall length is 2-7/16 inches with a 1-5/16 inch flute length, keeping the tool compact and rigid for use in screw machines, turret lathes, and CNC drilling setups. Two spiral flutes with a regular helix provide efficient chip evacuation. This bit is suited for machinists and tool-and-die professionals working in production environments.

The C70280 is built for drilling alloy steel and aluminum in screw machine and short-run CNC applications. Its screw machine length profile reduces deflection and improves hole accuracy in close-tolerance work. The parallel web configuration and web-thinned point lower thrust requirements, making it effective on harder alloy materials where a standard jobber-length bit would flex. It is a heavy-duty grade bit intended for shop environments where consistency across multiple holes is required.

Key Features

• Letter A size: 0.2340 inches decimal equivalent, fitting standard drill charts for close-tolerance work
• 135-degree split point with web thinning for self-centering entry and reduced thrust
• High-speed steel construction for durability across alloy steel and aluminum workpieces
• Screw machine length body (2-7/16 inches OAL) for rigidity in production drilling setups
• Right-hand cut with two regular-spiral flutes for clean chip removal
• Diameter tolerance of +0.0000 to -0.0007 inches for consistent hole sizing
• Meets ASME B94.11M and NAS 907 Type C specifications

Compatibility

Designed for use in screw machines, turret lathes, and short-hole CNC drilling operations. Primary workpiece materials listed by the manufacturer are alloy steel and aluminum. Straight-cylindrical shank fits standard drill chucks accepting 0.2340-inch shank diameters.

Installation Notes

This bit is installed by machinists and tool-and-die technicians in machine shop environments. Secure the straight-cylindrical shank fully in the drill chuck before operation and verify chuck tightness before cycling the machine. Always power down and lock out the machine before changing tooling. Use appropriate cutting fluid for alloy steel to extend tool life and maintain hole quality.