Hertel 01778042 Cobalt Stub Drill Bit No. 10 135 Point

Product Description

The HERTEL 01778042 is a cobalt stub-length drill bit designed for drilling into high-tensile strength metals. It carries a No. 10 wire size (0.1935 inches decimal diameter) and features a 135-degree split point with web thinning for fast, self-centering entry with reduced thrust. The stub-length body keeps the bit rigid and resistant to deflection in short-reach applications. Overall length is 0.5625 inches with a flute length of 0.3125 inches. The 1/4-28 threaded square shank provides secure, repeatable seating in compatible quick-change or threaded chuck systems. An oxide coating adds surface hardness and mild lubricity to extend tool life in demanding cuts.

This bit is suited for production drilling, maintenance, and fabrication work where high-tensile alloys, stainless steel, and hard ferrous metals are common workpiece materials. The stub configuration is particularly effective in drill press, CNC, or hand-drill applications where rigidity and chatter reduction matter. The right-hand cutting direction and regular spiral flute geometry support standard through-hole and blind-hole operations across general-purpose metalworking scenarios.

Key Features

• Cobalt construction for heat resistance and durability in hard and high-tensile metals
• 135-degree split point with web thinning reduces walk and lowers required feed force
• Stub-length body maximizes rigidity and minimizes deflection in tight setups
• Oxide finish improves surface hardness and extends service life
• 1/4-28 threaded square shank for secure, indexed seating in compatible drive systems
• NAS 965 Type D specification compliance for consistent dimensional standards

Compatibility

Designed for use with 1/4-28 threaded square shank quick-change or threaded chuck systems. Conforms to NAS 965 Type D specification for threaded shank stub drill bits.

Installation Notes

Installation and use of this drill bit should be performed by a qualified machinist or tradesperson familiar with proper drilling practices. Ensure the threaded shank is fully seated and secured in the chuck before operation. Verify spindle speed is appropriate for the workpiece material and bit diameter before starting the cut. Do not force the bit into the material; allow the split point geometry and appropriate feed rate to do the work.