Precision Twist Drill 6001157 Taper Shank Drill Bit 4MT

Product Description

The PRECISION TWIST DRILL 6001157 is a taper shank drill bit designed for heavy-duty drilling in metal, cast iron, and similar materials. Built from high speed steel (HSS) with an oxide finish, it measures 1.1094 inches (1-7/64 inches) in diameter and carries a Series 209 designation conforming to ANSI standards. The 4MT (Morse Taper 4) shank seats directly into compatible spindles and tailstocks on drill presses, lathes, and milling machines. A 118-degree standard point with web thinning reduces thrust and improves chip clearance at the start of the cut. This bit is a general-purpose tool suited for production and maintenance machining environments.

This drill bit is used in industrial and commercial machining applications where large-diameter through-holes or deep holes are required. The 4MT shank makes it a direct fit for machine tools equipped with a Number 4 Morse Taper spindle, including floor-standing drill presses, engine lathes, and radial arm drills. Right-hand cutting direction and a regular spiral flute support standard chip evacuation during ferrous and non-ferrous drilling operations. It is typically installed and operated by machinists and tool-and-die professionals in job shops and manufacturing facilities.

Key Features

• 1.1094 inch (1-7/64 inch) diameter for large-bore drilling applications
• 4MT (Morse Taper 4) shank for secure, self-holding fit in compatible spindles
• High speed steel construction rated for general-purpose machining
• Oxide finish for added surface hardness and mild corrosion resistance
• 118-degree standard point with web thinning for reduced entry thrust
• Right-hand spiral flute for efficient chip removal in typical drilling operations

Compatibility

Designed for use in machine tool spindles with a Number 4 Morse Taper (4MT) socket, including drill presses, engine lathes, and similar equipment. Conforms to ANSI standards.

Installation Notes

Installation is performed by a qualified machinist. Power down and lock out the machine spindle before seating or removing the taper shank. Insert the 4MT shank firmly into the spindle socket by hand, then drive it home with a draw bar or drift as required by the machine design. Never use this bit in a straight-shank chuck not rated for taper adapters, as shank slippage can cause injury and tool damage.