Cleveland C70292 Drill Bit Letter N 135 Pt Hss

Product Description

The CLEVELAND C70292 is a screw machine length drill bit sized to Letter N (0.3020 inches), built from high-speed steel with a bright, uncoated finish. It features a 135-degree split point and web-thinned geometry that reduces walking and cutting resistance at entry. With a straight-cylindrical shank and right-hand cut, it fits standard drill chucks without modification. At 2-13/16 inches overall length, it is optimized for close-quarters drilling in machine setups where a jobber-length bit would interfere. This is a heavy-duty grade bit suited for machinists, millwrights, and maintenance technicians working in production or shop environments.

The C70292 is designed for drilling into alloy steel and aluminum in screw machine and general machining applications. Its shortened overall length and parallel web configuration make it well suited for CNC lathes, turret setups, and bench drill presses where rigidity and stub-length clearance are required. The 1-5/8 inch flute length provides adequate chip evacuation in shallow to moderate-depth holes.

Key Features

• Letter N size — 0.3020 inches diameter with a tolerance of +0.0000 to -0.0010 inches
• 135-degree split point reduces walking and lowers thrust force at entry
• Web-thinned, parallel web construction improves chip clearance and cutting efficiency
• High-speed steel construction handles alloy steel and aluminum at standard machining speeds
• Screw machine length (2-13/16 inches OAL) provides rigidity in confined setups
• Meets ASME B94.11M and NAS 907 Type C specifications

Compatibility

Designed as an OEM-style replacement or direct-use screw machine drill bit for standard straight-shank drill chucks in production machining, turret lathe, and bench drill press applications where Letter N sizing is specified.

Installation Notes

Installation and use of this bit should be performed by qualified machinists or maintenance technicians familiar with drill press and lathe operation. Ensure the machine is fully de-energized and the chuck is secured before seating or removing the bit. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting that this bit does not support coolant-through delivery. Inspect the cutting edges for wear or chipping before each use and replace if the split point or cutting lips show visible damage.