Hertel 53383899 Screw Machine Drill Bit Size 19 Cobalt

Product Description

The HERTEL 53383899 is a screw machine length drill bit designed for high-performance drilling in tough materials. Built from cobalt tool steel with an oxide coating, this bit handles hardened steels, stainless, and abrasion-resistant alloys that standard HSS bits struggle with. The 135-degree split-point tip reduces walking and requires less thrust to start a hole without a center punch. At 1.25 inches overall length, it is optimized for close-quarters drilling where standard jobber-length bits are too long. Machinists, tool-and-die techs, and maintenance mechanics reach for screw machine length bits when working inside fixtures, vises, or tight machine bores. This is a single-piece unit sold individually.

This drill bit suits production and maintenance drilling operations on drill presses, CNC machining centers, and hand-held power drills where short-reach tooling is required. The 3xD flute-to-diameter ratio and 0.5625-inch spiral flute length provide adequate chip evacuation in shallow-to-medium depth holes. Typical applications include precision hole drilling in metal fabrication shops, toolrooms, and general industrial maintenance. The wire gauge size 19 decimal equivalent of 0.166 inches fits standard chucks and collets without adaptation.

Key Features

• Cobalt tool steel construction for extended tool life in hard and abrasion-resistant materials
• Oxide coating reduces friction and improves heat dissipation at the cutting edge
• 135-degree standard split point minimizes drill walk and reduces required feed pressure
• Screw machine length at 1.25 inches overall keeps the tool rigid in tight work envelopes
• Regular spiral flute type with 0.5625-inch flute length supports consistent chip clearing
• No coolant-through design — compatible with external flood coolant or dry cutting

Compatibility

Designed as an OEM-style replacement or direct-use screw machine length drill bit for standard 3-jaw chucks and collet systems accepting wire gauge tooling in the 0.150 to 0.200 inch decimal inch range.

Installation Notes

Installation is performed by machinists or maintenance technicians using a standard drill chuck or collet rated for the 0.166-inch shank diameter. Secure the bit fully in the chuck before operation and verify runout before drilling production holes. Power down the machine and lock out energy sources before changing tooling. Do not exceed the spindle speed recommended for cobalt drills at this diameter in the material being cut.