Value Collection 01220201 Left Hand Jobber Drill 5/16 in

Product Description

The VALUE COLLECTION 01220201 is a left-hand jobber-length drill bit ground from high speed steel (HSS) with a bright, uncoated finish. It measures 5/16 inch (0.3125 inch) in diameter and carries a standard 118-degree point angle suited for general-purpose drilling. Overall length is 4.5 inches, with a flute length of 3.1875 inches. The straight cylindrical shank and regular spiral flute geometry provide consistent chip evacuation during drilling operations. Web thinning reduces thrust requirements at the point, and the tapered web configuration adds rigidity along the flute length. This bit is intended for use by machinists, tool-and-die workers, and maintenance technicians who require left-hand rotation for specific drilling or extraction applications.

This bit is rated for general-purpose drilling in steel and cast iron. Left-hand drill bits are commonly used when extracting broken fasteners, as the left-hand rotation tends to back out a fastener while the drill advances. The 5/16 inch diameter fits standard drill chucks on reversible benchtop and handheld drill equipment. It is appropriate for both light production and maintenance-repair-operations (MRO) environments where HSS tooling is specified.

Key Features

• Left-hand cutting direction for broken fastener extraction and reverse-rotation applications
• 118-degree standard point angle for general-purpose use in steel and cast iron
• High speed steel construction provides adequate hardness and toughness for ferrous materials
• Bright uncoated finish allows visual inspection of cutting edge condition
• Web-thinned tapered web reduces drill thrust and improves point centering
• Straight cylindrical shank at 0.3125 inch diameter fits standard 3-jaw chucks

Compatibility

Designed as a general-purpose left-hand jobber drill bit for use in steel and cast iron workpieces. Compatible with any reversible drill press, CNC drilling machine, or handheld drill driver equipped with a chuck that accepts a 5/16 inch straight shank.

Installation Notes

Left-hand drill bits require a drill or driver set to reverse rotation before use. Secure the workpiece firmly before drilling to prevent movement under cutting load. Use cutting fluid or coolant when drilling ferrous materials to extend tool life and maintain edge sharpness. Inspect the cutting edges before each use; HSS bits can chip if used on hardened materials beyond their rated hardness range.