YG-1 D4148138 Screw Machine Drill Bit No. 38 Cobalt

Product Description

The YG-1 D4148138 is a No. 38 screw machine length drill bit with a cobalt gold plate finish, designed for precision drilling in metal fabrication, maintenance, and general machining applications. Screw machine length bits are shorter than jobber-length bits, providing greater rigidity and reduced deflection when drilling in tight spaces or production environments. The cobalt construction improves heat and wear resistance, making this bit well suited for harder materials where standard high-speed steel bits wear quickly.

This bit is sized to No. 38 and is intended for use in screw machines, drill presses, and handheld drills in industrial and trade settings. Machinists, maintenance technicians, and tool-and-die professionals commonly use screw machine length bits when working in confined spaces or when rigidity is a priority over reach. The gold plate finish serves as a visual indicator of the cobalt treatment and provides mild lubricity during cutting.

Key Features

• Screw machine length design for increased rigidity and reduced bit deflection
• Cobalt construction for enhanced heat and wear resistance on hard materials
• Gold plate finish indicates cobalt content and provides mild lubricity
• No. 38 size for precise small-diameter drilling
• Sold individually as a single-piece unit

Compatibility

Designed as a standard No. 38 screw machine length replacement bit compatible with conventional drill chucks used in screw machines, drill presses, and general-purpose drilling equipment.

Installation Notes

Secure the bit firmly in the chuck before operation and verify chuck jaw engagement before applying power. Use appropriate cutting fluid or lubricant when drilling hard metals to prolong bit life. Inspect the cutting edges for wear or chipping before each use and replace the bit if damage is detected. Follow applicable shop safety standards and machine operating procedures during use.