Hertel 66691833 Cobalt Screw Machine Drill Bit Size 7

Product Description

The HERTEL 66691833 is a cobalt screw machine length drill bit designed for high-performance drilling in tough materials including stainless steel, heat-treated alloys, and hard plastics. It carries a wire gauge size of 7, which corresponds to a decimal diameter of 0.2010 inches, and features a 135-degree split point that reduces walking and allows drilling without a center punch in many applications. The titanium nitride (TiN) coating increases surface hardness and extends tool life under repeated use. At 2.25 inches overall length, this stub-length bit delivers added rigidity compared to jobber-length equivalents, making it well suited for precision work in confined spaces or on drill press setups.

This bit is used across metalworking, maintenance, and fabrication applications where a short, stiff drill is preferred. The right-hand spiral flute with regular helix evacuates chips efficiently during through-hole and blind-hole operations in metal components. The straight cylindrical shank seats securely in standard drill chucks and quick-change holders. Machinists, tool-and-die technicians, maintenance mechanics, and industrial trades professionals routinely reach for screw machine bits like this one when accuracy and rigidity matter more than reach. The web-thinned, parallel web configuration reduces thrust requirements, which is especially useful when drilling harder alloys by hand or on light-duty machines.

Key Features

• Cobalt construction with TiN coating for extended tool life in ferrous and hard materials
• 135-degree split point minimizes walking and reduces thrust at entry
• Stub screw machine length (2.25 inches OAL) provides superior rigidity over jobber-length bits
• Right-hand spiral flute with 1.1875-inch flute length for efficient chip evacuation
• Web-thinned parallel web reduces cutting resistance in heavy-duty applications
• Straight cylindrical shank fits standard drill chucks and quick-change adapters

Compatibility

Designed as a direct-fit replacement or standard addition for any drill press, hand drill, or CNC setup accepting a 0.2010-inch straight cylindrical shank bit. Fits the 0.2000 to 0.2500 inch drill bit size range class.

Installation Notes

Install and remove this bit with the drilling machine fully powered off and the chuck key removed from the vicinity of the work area. Seat the straight shank fully into the chuck jaws and tighten evenly to prevent runout. Use cutting fluid appropriate for the workpiece material when drilling ferrous metals or stainless steel to protect the coating and maximize bit life. Verify spindle speed is appropriate for the material and diameter before starting the cut.