Cleveland C70321 Screw Machine Drill Bit Wire 17 Hss

Product Description

The CLEVELAND C70321 is a screw machine length drill bit designed for fast, accurate drilling in metalworking and fabrication applications. Built from high-speed steel with a bright, uncoated finish, this bit features a 135-degree split point that reduces walking and allows drilling to start without a center punch. The web-thinned, parallel-web construction lowers cutting resistance and helps clear chips efficiently. At 0.1730 inches in diameter with an overall length of 2.1875 inches, it is sized for tight-clearance drilling operations where a jobber-length bit would not fit. A straight-cylindrical shank provides secure retention in standard drill chucks and quick-change holders.

This bit is intended for use in screw machine shops, production drilling setups, and general metalworking environments. It is suited for drilling alloy steel and aluminum in applications that demand close-tolerance holes. The wire size 17 designation corresponds to a 0.1730-inch diameter, which falls within the 0.1500 to 0.2000 inch diameter range. Its short flute length and reduced overall length make it appropriate for CNC turret operations, drill presses, and hand-held power tools where rigidity and precision matter. Licensed tradespeople and machinists in manufacturing and maintenance roles are the primary users.

Key Features

• 135-degree split point reduces bit walking and lowers entry force on hard materials
• Web-thinned, parallel-web design improves chip evacuation and reduces thrust load
• High-speed steel construction handles alloy steel and aluminum at standard cutting speeds
• Screw machine length at 2.1875 inches overall provides added rigidity over jobber-length bits
• Straight-cylindrical shank fits standard drill chucks and quick-change systems
• Meets ASME B94.11M and NAS 907 Type C specifications for dimensional consistency

Compatibility

Designed as an OEM-style replacement and production-use drill bit for standard drill chucks and quick-change holders accepting a 0.1730-inch straight-cylindrical shank across screw machine, CNC turret, and drill press setups.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or tradesperson familiar with metal cutting operations. Secure the shank fully in the chuck and verify runout before beginning a drilling cycle. Power down and de-energize any machine tool before changing or securing the bit. Follow the machine manufacturer recommended speeds and feeds for the target workpiece material to avoid premature bit wear or breakage.