Cleveland C70343 Screw Machine Drill Bit Wire 39 Hss

Product Description

The CLEVELAND C70343 is a screw machine length drill bit sized to wire gauge 39, equivalent to 0.0995 inches in diameter. 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 on entry. The overall length is 1-13/16 inches with a 13/16-inch flute length, making it a compact, stubby format suited for close-tolerance drilling in tight spaces. The straight-cylindrical shank measures 0.0995 inches in diameter and 1 inch in length. This bit is manufactured to ASME B94.11M and NAS 907 Type C standards, making it a recognized choice in precision and aerospace-adjacent machining environments.

The C70343 is intended for production drilling operations where a short, rigid bit is required to maintain positional accuracy. Primary workpiece materials include alloy steels and aluminum. The screw machine length format reduces deflection compared to jobber-length bits, which makes it a common choice for CNC machining centers, drill presses, and turret lathes running repetitive small-diameter hole programs. It is sold individually and is appropriate for shops requiring controlled-lot procurement.

Key Features

• Wire gauge 39 size at 0.0995 inches diameter with a tight tolerance of +0.0000 to -0.0005 inches
• 135-degree split point reduces thrust and minimizes center-walking on entry
• Web-thinned, parallel-web construction improves chip evacuation in deep cuts
• High-speed steel construction handles alloy steel and aluminum workpieces
• Screw machine length format provides extra rigidity versus jobber-length bits
• Meets ASME B94.11M and NAS 907 Type C specifications

Compatibility

Designed as an OEM-style replacement or direct-application screw machine length drill bit for use in standard straight-shank drill chucks and collet holders accepting 0.0995-inch shank diameters.

Installation Notes

Install in a properly sized drill chuck or collet rated for the shank diameter before securing the workpiece. Ensure the spindle and workpiece are secure before starting the machine. Follow shop safety protocols and applicable OSHA machining guidelines when operating drilling equipment. Inspect the cutting edges for wear before each use, as small-diameter bits in this range are susceptible to breakage when dull or misaligned.