Cleveland C70356 Screw Machine Drill Bit 52 Hss

Product Description

The CLEVELAND C70356 is a screw machine length drill bit in wire size 52, measuring 0.0635 inches in diameter, designed for high-speed steel performance in demanding production environments. Built to ASME B94.11M and NAS 907 Type C standards, it features a 135-degree split point that reduces walking and requires no center punch on most materials. The bright, uncoated finish suits general-purpose drilling where coating buildup is a concern. At 1-11/16 inches overall length, this stubby format provides rigidity in screw machine, CNC, and drill press applications. Installation is handled by machinists and tool-room technicians working in production or job-shop settings.

This bit is suited for drilling alloy steels and aluminum in tight-tolerance applications where a short, stiff drill body reduces deflection. The parallel web configuration and web-thinned geometry improve chip evacuation and reduce thrust load. Its straight cylindrical shank fits standard collets, chucks, and quick-change tooling commonly found in screw machines and machining centers. The heavy-duty grade construction supports repeat-cycle production use where consistent hole quality across large run quantities is required.

Key Features

• Wire size 52 with 0.0635-inch diameter and tight tolerance of +0.0000 to -0.0005 inches
• 135-degree split point reduces walking and lowers thrust during entry
• Web-thinned, parallel web design improves chip flow and cutting efficiency
• Screw machine length body (1-11/16 inches OAL) provides maximum rigidity
• High-speed steel construction rated for heavy-duty, high-cycle production use
• Meets ASME B94.11M and NAS 907 Type C specifications

Compatibility

Designed for use in screw machines, CNC machining centers, and drill presses with standard straight-cylindrical chuck or collet systems; primary workpiece materials include alloy steel and aluminum.

Installation Notes

This drill bit is installed by machinists and tool-room operators in machine tool setups. Ensure the spindle is fully stopped and de-energized before changing tooling. Secure the shank fully in the collet or chuck to the manufacturer-specified engagement depth to prevent pullout during operation. Verify workpiece fixturing and coolant setup before starting a production run; this bit is configured without coolant-through capability, so external coolant or cutting fluid application is recommended when drilling alloy steels.