Cleveland C01821 Jobber Drill Bit No. 70 Hss Oxide

Product Description

The CLEVELAND C01821 is a jobber-length twist drill bit sized at No. 70 wire gauge, equal to 0.0280 inch decimal diameter. Built from high speed steel with an oxide coating for added surface hardness, this bit delivers reliable performance in general-purpose drilling applications. It features a 118-degree standard point angle, a two-flute regular spiral configuration, and a straight-cylindrical shank. Overall length is 1.25 inches with a flute length of 0.375 inch. The web is thinned and tapered for improved chip clearance and reduced thrust at entry. Licensed tradespeople and machinists reach for this bit when precision small-diameter holes are required.

This bit is rated for primary use in aluminum but handles a range of non-ferrous and softer ferrous materials in general-purpose shop and field work. The No. 70 size places it in the 0.0000 to 0.0500 inch drill diameter range, making it a common choice for pilot holes, tapping prep, and fine detail work in HVAC, electrical, and light fabrication settings. It conforms to ASME B94.11M and DIN 338 standards, and carries ANSI specification designation. Sold individually; minimum order quantity is 10 units per order.

Key Features

• No. 70 wire size, 0.0280 inch decimal diameter with a tight diameter tolerance of -0.0005 to 0.0000 inch
• 118-degree standard point angle with web-thinned, tapered web for reduced thrust and cleaner entry
• High speed steel construction with oxide coating for surface hardness and corrosion resistance
• Two-flute regular spiral geometry for efficient chip evacuation in small-diameter drilling
• Straight-cylindrical shank, 0.0280 inch diameter, compatible with standard drill chucks
• Meets ASME B94.11M and DIN 338 standards; ANSI specification designation

Compatibility

Designed as a general-purpose jobber-length drill bit for use in standard drill chucks and CNC or manual drilling equipment that accepts straight-cylindrical shanks at 0.0280 inch diameter.

Installation Notes

Install in a drill press, hand drill, or CNC spindle with a chuck rated for the 0.0280 inch shank diameter. Secure the workpiece firmly before drilling to prevent walking at this small diameter. Use appropriate cutting fluid or lubricant when drilling metals to extend bit life and maintain hole tolerance. Replace the bit if tip geometry shows wear, as re-sharpening at this size requires precision equipment.