Cleveland C11675 Jobber Drill Bit No. 21 Hss 135 Deg

Product Description

The CLEVELAND C11675 is a jobber-length twist drill bit designed for precision hole-making in metal fabrication, maintenance, and production drilling applications. Built from high speed steel with a bright uncoated finish, it carries a wire gauge size of No. 21, translating to a decimal diameter of 0.1590 inches. The 135-degree split point reduces walking on entry and lowers thrust force compared to a standard 118-degree point. Overall length is 3.25 inches with a flute length of 2.125 inches. The tapered web and web-thinned geometry improve chip evacuation and cutting efficiency. Licensed HVAC techs, machinists, pipefitters, and electricians reach for this size when drilling pilot holes, clearance holes, or tapping prep holes in sheet metal and light structural stock.

The C11675 is rated for primary use in aluminum but performs across a range of non-ferrous metals, mild steels, and plastics in both shop and field environments. The straight-cylindrical shank seats securely in standard three-jaw keyed or keyless chucks. The regular spiral flute and right-hand cut make it compatible with conventional drill presses, hand drills, and cordless driver-drill units. It conforms to NAS 907 Type B standards, making it suitable for aerospace-adjacent maintenance and fabrication work where dimensional tolerances matter. Sold individually, it is available in multiples of 12.

Key Features

• No. 21 wire size — 0.1590 inch decimal diameter with a tolerance of -0.0007 to 0.0000 inches for consistent fit
• 135-degree split point reduces center-punch dependency and lowers entry thrust
• Web-thinned, tapered web construction improves chip flow and reduces heat buildup
• High speed steel construction handles intermittent cutting loads without rapid edge degradation
• Bright uncoated finish allows easy visual inspection of edge condition after use
• Meets NAS 907 Type B specification for dimensional and performance consistency

Compatibility

Designed as a jobber-length drill bit for use in standard three-jaw chucks accepting a 0.1590-inch straight-cylindrical shank. Primary workpiece material rating is aluminum; also suited for non-ferrous metals, mild steel, and plastics. Conforms to NAS 907 Type B and UNSPSC 23241634.

Installation Notes

Secure the shank fully in the chuck before beginning any drilling operation and verify chuck key is removed before powering the tool. Use appropriate cutting fluid or lubricant when drilling metals to extend edge life and reduce heat. Wear eye protection and secure the workpiece to prevent rotation. Inspect the cutting edges before each use and replace if chipping or dulling is observed, as a degraded edge increases thrust and can cause workpiece damage or bit breakage.