Hertel 74132168 Screw Machine Drill Bit Size 19 Cobalt

Product Description

The HERTEL 74132168 is a screw machine length drill bit engineered for high-performance drilling in metalworking and machining applications. Built from cobalt high-speed steel and finished with a titanium aluminum nitride (TiAlN) coating, this bit handles elevated heat and abrasion better than standard HSS tooling. It is sized to wire gauge number 19, which corresponds to 0.1660 inch decimal diameter. The 135-degree split point reduces thrust and walks less on entry, improving hole location accuracy. Overall length is 2.125 inches with a flute length of 1.0625 inches. The shortened screw machine length profile increases rigidity and reduces deflection in drill press, CNC, and turret lathe setups. Machinists, tool-and-die technicians, and production operators are the primary users of this bit.

This drill bit is suited for production metalworking environments where hole quality and tool life under continuous use are priorities. The screw machine length format is commonly specified for drill press fixtures, gang drilling operations, and CNC machining centers where extended-length bits would introduce chatter or runout. The straight-cylindrical shank seats directly into standard drill chucks and collet-style toolholders without modification. TiAlN coating extends useful tool life when drilling medium-carbon steels, alloy steels, cast iron, and stainless steel at elevated spindle speeds. Coolant-through capability is not present on this bit, so flood coolant or cutting fluid applied externally at the work zone is the standard approach for heat management.

Key Features

• Cobalt substrate resists heat and wear in hard and abrasive metal drilling
• TiAlN coating extends tool life at elevated cutting speeds compared to uncoated cobalt
• 135-degree split point reduces entry thrust and improves hole-start accuracy without center-punching
• Web-thinned, parallel-web construction lowers cutting resistance at the chisel edge
• Screw machine length at 2.125 inches overall maximizes rigidity and minimizes deflection
• Straight-cylindrical shank is compatible with standard drill chucks and collet holders

Compatibility

Designed as a standard wire-gauge number 19 screw machine length drill bit with a straight-cylindrical shank, this bit fits any drill chuck or collet system that accepts a 0.1660 inch shank diameter.

Installation Notes

A licensed machinist or qualified shop technician should verify spindle speed and feed rate against manufacturer tooling charts before use. Secure the shank fully in the chuck or collet and confirm runout before cutting. Apply external cutting fluid or flood coolant at the work zone to manage heat since this bit does not support coolant-through delivery. Inspect the cutting edges and coating condition before each use and replace the bit when point geometry shows signs of wear to avoid oversized or out-of-round holes.