Precision Twist Drill 5999197 Jobber Drill Bit Hss

Product Description

The PRECISION TWIST DRILL 5999197 is a jobber-length drill bit sized at wire size No. 1 (0.2280 inches decimal equivalent), manufactured from high speed steel with a bright uncoated finish. It features a standard 118-degree split point, a regular spiral flute, and a straight-cylindrical shank. The overall length is 3.875 inches with a flute length of 2.625 inches, giving a 12xD flute-to-diameter ratio suited to general-purpose through-hole drilling. The web is thinned and tapered, reducing entry force and improving chip evacuation on ferrous and non-ferrous materials. This bit is installed by machinists, maintenance technicians, and metal fabricators using standard drill presses, CNC machines, or handheld power tools.

This jobber bit is designed for general-purpose drilling in steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium. It belongs to Precision Twist Drill series R10P-R15P-R18P, which covers straight-shank HSS jobber bits built to ANSI standards. The 0.2280-inch diameter falls within the 0.2000 to 0.2500 inch size range. Typical applications include drilling clearance holes, pilot holes, and through holes in light fabrication, maintenance, and production environments where a standard two-flute right-hand bit is appropriate.

Key Features

• Wire size No. 1 at 0.2280 inches decimal equivalent for precise hole sizing
• High speed steel construction provides durability across ferrous and non-ferrous workpieces
• 118-degree standard point angle with web thinning for reduced thrust and cleaner entry
• Tapered web and regular spiral flute promote efficient chip evacuation
• Straight-cylindrical shank compatible with standard three-jaw drill chucks
• Bright uncoated finish for easy visual inspection of wear
• Built to ANSI specification for consistent dimensional accuracy

Compatibility

Part of the Precision Twist Drill R10P-R15P-R18P series. Fits any standard drill chuck accepting a 0.2280-inch straight-cylindrical shank. Suitable for use in drill presses, milling machines, CNC machining centers, and handheld power drills. Compatible workpiece materials include steel, stainless steel, cast iron, non-ferrous metals, superalloys, and titanium per manufacturer specification.

Installation Notes

A licensed machinist or qualified technician should secure the shank fully in a properly sized drill chuck before operation. Ensure the workpiece is clamped or fixtured to prevent movement during drilling. Use appropriate cutting fluid or coolant for the workpiece material to extend tool life, noting that this bit does not have internal coolant-through capability. Inspect the cutting edges before each use and replace the bit if chipping, excessive wear, or heat discoloration is observed.