Precision Twist Drill 5997751 No. 33 Cobalt Jobber Drill

Product Description

The PRECISION TWIST DRILL 5997751 is a No. 33 wire-size cobalt jobber drill bit designed for general-purpose drilling in steel and other demanding workpiece materials. Built from cobalt high-speed steel with an oxide and straw-finish coating, this bit delivers increased heat resistance and extended tool life compared to standard HSS. The 135-degree split point reduces walking at drill entry and lowers thrust force, making it well-suited for production work on harder ferrous metals. The bit measures 2.625 inches overall with a 1.5-inch flute length and a straight cylindrical shank diameter of 0.1130 inches. It weighs approximately 0.04 pounds. Licensed machinists, maintenance mechanics, and HVAC or plumbing fabricators working with steel components will reach for this bit regularly.

This drill bit is built for drilling steel, stainless steel, cast iron, non-ferrous metals, and high-temp alloys — reflected in its P, M, K, N, and S workpiece material codes. The short, rigid jobber-length geometry suits benchtop drill presses, hand drills, and CNC machining centers where a compact tool with a straight shank is preferred. It fits into the R10CO, R15CO, and R18CO series from Precision Twist Drill, making it a direct catalog-matched selection within that product family. The No. 33 wire-gauge size at 0.1130 inches decimal makes it a common choice for tapping prep, clearance holes, and close-tolerance hole work in light steel fabrication and equipment repair.

Key Features

• Cobalt high-speed steel construction for elevated heat resistance in steel and alloy drilling
• 135-degree standard split point reduces drill walking and decreases entry thrust
• Oxide and straw coating provides corrosion resistance and reduced friction
• Regular spiral flute with tapered web and web-thinned geometry aids chip evacuation
• Right-hand cutting, straight cylindrical shank — compatible with standard drill chucks
• Meets ANSI and NAS 907 specification standards for heavy-duty drill bit grade

Compatibility

Part of the PRECISION TWIST DRILL R10CO-R15CO-R18CO series. Designed as a direct-fit replacement or catalog-matched selection within that cobalt jobber drill series for No. 33 wire-size applications.

Installation Notes

Installation and use should be performed by qualified machinists or tradespeople familiar with drill press and hand-drill operation. Secure the workpiece firmly before drilling and ensure the shank is fully seated and tightened in the chuck before use. Appropriate cutting fluid or coolant is recommended when drilling steel to extend tool life, even though this bit does not support through-coolant. Always wear appropriate eye protection and follow shop safety protocols when operating rotary cutting tools.