Precision Twist Drill 5998825 Jobber Drill Bit Letter M

Product Description

The PRECISION TWIST DRILL 5998825 is a jobber-length drill bit sized to Letter M (0.2950 inches) with a 118-degree standard point angle and a steam oxide coating over a high-speed steel body. It is designed for general-purpose drilling in metalworking applications where consistent hole quality and durability are required. The spiral flute geometry and right-hand cut produce clean chip evacuation in a wide range of workpiece materials. Licensed HVAC technicians, maintenance machinists, plumbers, and industrial tradespeople reach for jobber-length bits like this one for everyday metal drilling on the bench or in the field.

This bit is suited for drilling steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium in both shop and field environments. The Series R10-R15-R18 designation places it within a general-purpose jobber-length family built to ANSI standards. Its 4.375-inch overall length and 3.0625-inch flute length make it a practical fit for drill presses, hand drills, and right-angle drill attachments commonly used in HVAC, plumbing, and electrical rough-in work.

Key Features

• Letter M size at 0.2950 inches decimal equivalent for precise hole sizing
• 118-degree standard point angle for general-purpose metal entry and centering
• Steam oxide coating reduces friction and provides light corrosion resistance during storage and use
• Right-hand spiral flute with web-thinned tapered web for reduced thrust force
• Straight-cylindrical shank fits standard 3-jaw drill chucks without adapters
• ANSI-compliant construction to Series R10-R15-R18 specification

Compatibility

Designed as a general-purpose jobber-length drill bit compatible with any standard drill press, hand drill, or drill driver equipped with a chuck sized to accept a 0.2950-inch straight-cylindrical shank. Workpiece material compatibility includes steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per the manufacturer specification.

Installation Notes

Secure the shank fully in the drill chuck and verify chuck key is removed before operating. Reduce feed rate and use cutting fluid when drilling stainless steel, superalloys, or titanium to minimize heat buildup and extend tool life. When drilling on a drill press, clamp the workpiece securely and set spindle speed appropriate for the material and hole diameter. Wear appropriate eye protection in compliance with applicable shop safety standards.