Cleveland C70308 Screw Machine Drill Bit Wire 4 Hss

Product Description

The CLEVELAND C70308 is a screw machine length drill bit designed for high-speed steel cutting in compact, high-torque applications. Built to ASME B94.11M standards and meeting NAS 907 Type C specification, this bit features a 135-degree split point that reduces walking and requires no center punch on most materials. The web-thinned, parallel web construction reduces thrust load and improves chip evacuation. At 2.375 inches overall length, the shortened body is optimized for turret lathes, screw machines, CNC chuckers, and other short-stroke drilling setups. The bright uncoated finish suits general-purpose use across a range of base metals.

This bit is suited for production drilling in alloy steel and aluminum on automatic screw machines, CNC turning centers, and bench drill presses where stub-length geometry is preferred. The 0.2090 inch diameter corresponds to wire gauge size 4, placing it in the 0.2000 to 0.2500 inch diameter range. It is a heavy-duty grade bit appropriate for repetitive, high-cycle drilling operations in shop and production environments. A licensed machinist or tool-and-die technician would typically specify and install this tooling.

Key Features

• 135-degree split point reduces thrust and eliminates center-punch requirement on most workpieces
• Web-thinned parallel web lowers cutting resistance and improves chip flow
• Screw machine length at 2.375 inches overall keeps the tool rigid in short-stroke setups
• Right-hand cut with 2 regular spiral flutes and 1.25-inch flute length
• Straight-cylindrical shank at 0.2090 inch diameter fits standard drill chucks without adapters
• Meets ASME B94.11M and NAS 907 Type C specification for controlled tolerances

Compatibility

Designed as a heavy-duty OEM-style replacement or production tooling option for screw machines, CNC turning centers, and drill presses accepting straight-cylindrical shank drill bits in the 0.2000 to 0.2500 inch diameter range.

Installation Notes

Installation requires a compatible drill chuck or collet rated for straight-cylindrical shanks at 0.2090 inch diameter. Always secure the workpiece and confirm the machine is at a full stop before changing tooling. Follow applicable shop safety standards and machine manufacturer torque and speed guidelines for high-speed steel bits in the selected workpiece material. Inspect the cutting edges for wear or chipping before each use in high-cycle production runs.