Cleveland C70311 Screw Machine Drill Bit Wire Size 7 Hss

Product Description

The CLEVELAND C70311 is a screw machine length drill bit designed for high-speed steel cutting in tight-clearance drilling applications. Built to Series 2330 standards, this wire-gauge No. 7 bit measures 0.2010 inches in diameter with an overall length of 2.25 inches, making it well suited for stub-length drilling where rigidity and minimal deflection are priorities. The 135-degree split point reduces thrust and self-centers on contact, eliminating the need for a center punch in most setups. Web thinning further reduces cutting resistance. Licensed machinists, tool-and-die workers, and maintenance technicians install this bit in benchtop drill presses, CNC machining centers, and handheld drilling tools.

The C70311 is suited for drilling alloy steel and aluminum workpieces in production and maintenance environments. Its screw machine length profile — shorter than a jobber bit — delivers increased rigidity in applications where hole location accuracy and surface finish matter, such as tapping prep, close-tolerance assembly drilling, and sheet metal work. The bright uncoated finish makes it a practical general-purpose choice where a coating is not required by the application.

Key Features

• Wire size No. 7 diameter: 0.2010 inches with a tolerance of +0.0000 to -0.0007 inches
• 135-degree split point for self-centering and reduced drilling thrust
• Web-thinned parallel web for lower cutting resistance
• Screw machine length body (2.25 inches OAL) for enhanced rigidity over jobber-length bits
• High-speed steel construction rated for alloy steel and aluminum workpieces
• Bright uncoated finish; no additional heat treatment or coating to affect dimensional tolerances
• Meets ASME B94.11M and NAS 907 Type C specifications

Compatibility

Designed as a screw machine length replacement or production drill bit for use with standard 3-jaw drill chucks accepting a 0.2010-inch straight cylindrical shank. Suitable for benchtop drill presses, upright machining centers, and handheld power drills where the straight-cylindrical shank diameter matches chuck capacity.

Installation Notes

Installation is performed by machinists or maintenance technicians familiar with rotating cutting tools. Secure the shank fully into the chuck and verify concentricity before operation. Ensure the workpiece is clamped securely to prevent movement during drilling. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or dulling is observed.