Cleveland C70316 Screw Machine Drill Bit No. 12 Hss

Product Description

The CLEVELAND C70316 is a screw machine length drill bit designed for high-speed steel drilling in tight-clearance and production machining environments. Built to Series 2330 specifications, it features a 135-degree split point with web thinning for reduced thrust and self-centering entry without a center punch. The wire gauge No. 12 size corresponds to a decimal diameter of 0.1890 inches and an overall length of 2.25 inches, making it a compact stub-style bit suited for drill presses, CNC machining centers, and screw machines where standard-length bits cannot be accommodated. The bright, uncoated high-speed steel construction handles general-purpose metal removal across a range of workpiece materials.

This bit is rated for use on alloy steel and aluminum workpieces. Its screw machine length profile reduces deflection during entry, which is particularly useful in production environments requiring consistent hole location and diameter tolerance. The straight cylindrical shank seats directly into standard drill chucks and collet holders without modification. Machinists and tool-and-die professionals typically use this bit in repetitive drilling cycles where a shorter, stiffer flute geometry improves hole quality and tool life compared to jobber-length alternatives.

Key Features

• 135-degree split point with web thinning reduces thrust and eliminates center-punch requirements
• Screw machine length (2.25 inches OAL) provides increased rigidity and reduced deflection
• Wire gauge No. 12 decimal diameter of 0.1890 inches with tolerance of +0.0000 to -0.0007 inches
• High-speed steel construction, bright uncoated finish, suitable for alloy steel and aluminum
• Straight cylindrical shank diameter of 0.1890 inches fits standard chucks and collets
• Conforms to ASME B94.11M and NAS 907 Type C specifications

Compatibility

Designed as an OEM-style replacement or direct substitute for No. 12 wire size screw machine drill bits conforming to ASME B94.11M and NAS 907 Type C standards. Compatible with standard drill chucks and collet systems accepting a 0.1890-inch straight cylindrical shank.

Installation Notes

Installation and use of this drill bit should be performed by qualified machinists or trade professionals familiar with drilling operations and machine tool safety. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable limits. Always power down and lock out the machine before changing tooling. Do not exceed the recommended speed and feed range for the workpiece material being drilled.