Cleveland C70325 Screw Machine Drill Bit Wire 21 Hss

Product Description

The CLEVELAND C70325 is a screw machine length drill bit designed for high-speed steel cutting in tight-clearance drilling applications. Sized at wire gauge 21 (0.1590 inches decimal), it features a 135-degree split point with web thinning for fast engagement and reduced walking on entry. The overall length of 2.125 inches and shortened flute length make it well suited for drill press and CNC screw machine work where rigidity matters. A bright, uncoated finish keeps the steel at its native hardness. This bit is installed and used by machinists, tool-and-die technicians, and skilled tradespeople working in production or maintenance environments.

The C70325 is built for drilling into alloy steel and aluminum, two of the most common workpiece materials in light manufacturing and mechanical contracting. Its screw machine length profile — shorter than jobber length — reduces deflection when drilling at higher feed rates or in interrupted cuts. The straight-cylindrical shank seats securely in standard drill chucks and collet holders without modification. This bit is typically used in repetitive-hole applications such as tapping prep, clearance holes, and pilot drilling on structural or component assemblies.

Key Features

• Wire size 21 (0.1590 inches) with diameter tolerance of +0.0000 to -0.0007 inches for precise hole sizing
• 135-degree split point with web thinning reduces thrust force and self-centers on entry
• Screw machine length at 2.125 inches overall provides added rigidity over jobber-length bits
• High-speed steel construction rated heavy duty for alloy and aluminum workpieces
• Bright uncoated finish — no coating buildup to affect hole diameter tolerance
• Right-hand cut with regular spiral, 2 flutes — compatible with standard drill chucks and CNC tooling setups

Compatibility

Designed as a screw machine length replacement drill bit for use in standard drill press, CNC, and hand-held drill chuck setups accepting a 0.1590-inch straight-cylindrical shank. Meets ASME B94.11M and NAS 907 Type C specification designations.

Installation Notes

Secure the shank fully in the drill chuck or collet before operation and verify runout with a dial indicator when precision hole tolerance is required. Disconnect and lock out all power to the machine before changing bits. Apply cutting fluid appropriate for the workpiece material — particularly when drilling alloy steel — to extend tool life and maintain hole quality. Follow applicable OSHA machine guarding requirements and shop safety protocols for rotating cutting tools.