Hertel 74130139 Screw Machine Drill Bit Size 1 Cobalt

Product Description

The HERTEL 74130139 is a screw machine length drill bit designed for high-production drilling in metal fabrication and machining applications. Built from cobalt tool steel with a titanium aluminum nitride (TiAlN) coating, this bit handles the heat and abrasion common when drilling hard metals, stainless steel, and high-temperature alloys. The 135-degree split point self-centers on contact, reducing the need for a center punch and minimizing walking on smooth surfaces. Overall length is 2-7/16 inches with a 1-5/16 inch flute length, making it compact enough for tight-clearance work in drill presses and CNC machines. This is a right-hand cutting, straight-cylindrical shank bit sized at 0.2280 inches (wire size 1).

This bit is suited for industrial and trade shops performing high-cycle drilling in ferrous and non-ferrous metals. The screw machine length profile keeps the bit rigid and reduces deflection during deep-feed operations, making it a common choice for production drilling, fixture work, and close-tolerance hole making. The TiAlN coating extends tool life in dry or minimal-lubrication cutting environments. Machinists, tool and die technicians, and industrial maintenance professionals will find this bit appropriate for both manual drill presses and CNC drilling operations.

Key Features

• Cobalt construction for elevated heat resistance in hard-metal drilling
• TiAlN coating extends tool life and reduces friction in dry cutting
• 135-degree split point for self-centering and reduced thrust
• Web-thinned parallel web for improved chip clearance and cutting efficiency
• Screw machine length profile minimizes deflection in high-feed applications
• Right-hand spiral flute, straight-cylindrical shank for standard chuck compatibility

Compatibility

Designed as an OEM-style replacement or production-grade bit for use in standard drill presses, CNC drilling centers, and hand-held drill motors accepting a straight-cylindrical shank.

Installation Notes

Installation is performed by machinists and industrial maintenance technicians. Secure the straight shank firmly in a keyed or keyless chuck before operation and verify runout is within acceptable limits. Ensure the machine spindle is at a complete stop before changing bits. Follow applicable shop safety standards and equipment manufacturer guidelines for drill speed and feed rate selection based on workpiece material.