Precision Twist Drill 5997759 Cobalt Jobber Drill No. 35

Product Description

The PRECISION TWIST DRILL 5997759 is a No. 35 wire gauge cobalt jobber-length drill bit designed for high-production drilling in steel and other demanding workpiece materials. Built from cobalt high-speed steel with an oxide and straw finish, this bit delivers improved heat resistance and longer tool life compared to standard HSS drills. The 135-degree split point reduces walking on entry and requires no center punch on flat stock. At 2.625 inches overall length with a 1.5-inch flute, it handles typical jobber-depth holes in sheet and structural steel. This bit is a standard tool for machinists, maintenance techs, and fabricators working with ferrous and non-ferrous metals.

The 5997759 is suited for drilling steel, stainless, cast iron, non-ferrous alloys, and high-temp aerospace alloys across a range of workpiece material codes including P, M, K, N, and S classifications. Its regular spiral flute and tapered web with web thinning make it effective in drill presses, CNC machines, and hand-held power drills. It is a general-purpose heavy-duty bit appropriate for both production floor and maintenance shop use. The straight cylindrical shank fits standard drill chucks without any adapter. The series designation R10CO-R15CO-R18CO identifies its placement in the PRECISION TWIST DRILL cobalt jobber line.

Key Features

• No. 35 wire gauge size, 0.110 inch diameter, straight cylindrical shank
• 135-degree standard split point reduces bit walking and eliminates center-punching on flat stock
• Cobalt HSS construction with oxide and straw coating for elevated heat and wear resistance
• Web-thinned tapered web reduces thrust and improves chip clearance
• Regular spiral flute, right-hand cutting direction, 1.5 inch maximum drilling depth
• Meets ANSI and NAS 907 standards; rated for steel and multi-material general-purpose drilling

Compatibility

Part of the PRECISION TWIST DRILL Series R10CO-R15CO-R18CO cobalt jobber line. Fits any standard drill chuck accepting a 0.110-inch straight cylindrical shank. Rated for primary workpiece material codes P, M, K, N, and S covering steel, stainless, cast iron, non-ferrous, and super alloy applications.

Installation Notes

Installation and use should be performed by qualified machinists or mechanics familiar with cutting tool selection and machine operation. Power down and de-energize any drill press or CNC spindle before changing tooling. Secure the shank fully in the chuck and verify runout before cutting. Use appropriate cutting fluid or coolant for the workpiece material to preserve edge life; this bit does not support coolant-through delivery.