Precision Twist Drill 5999483 Taper Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999483 is a taper shank drill bit designed for heavy-duty drilling in metal, steel, and similar materials. It carries a 4MT (Morse Taper 4) shank, making it compatible with machine spindles and drill press quills that accept this taper designation. The cutting end measures 1.2656 inches (1-17/64 inches) in diameter with a 118-degree standard point angle and web-thinned geometry to reduce thrust and improve chip ejection at entry. Constructed from high speed steel with an oxide finish, this bit is built for general-purpose production and toolroom applications where consistent, repeatable hole quality is required.

This drill bit is suited for machine shop, maintenance, and industrial fabrication environments where large-diameter through-holes or blind holes are needed. The Series 209 design follows ANSI standards and is typically chucked directly into a drill press, milling machine, or lathe tailstock equipped with a 4MT socket. The spiral flute configuration and right-hand cutting direction are standard for conventional drilling setups. The bit is not configured for coolant-through operation, so flood coolant or cutting oil applied externally is the appropriate lubrication method for extended runs in ferrous materials.

Key Features

• 1.2656 inch (1-17/64 inch) cutting diameter for large-format hole work
• 4MT Morse Taper shank seats directly in compatible machine spindles without a chuck
• 118-degree standard point angle with web-thinned tip reduces entry thrust
• High speed steel construction with oxide finish for general-purpose durability
• 8.5 inch spiral flute length supports deeper cuts with adequate chip clearance
• Right-hand cutting, regular spiral, ANSI-compliant Series 209 geometry

Compatibility

Designed as an OEM-style replacement or direct-use taper shank drill bit for machine spindles and drill press quills accepting a 4MT (Morse Taper 4) shank designation.

Installation Notes

Installation is performed by machinists or toolroom technicians familiar with Morse taper tooling. Before seating the bit, ensure the machine spindle socket is clean and free of chips or burrs that could prevent full taper engagement. Power down and lock out the machine before inserting or removing the bit. Use a drift and knockout bar to remove the taper shank — never strike the bit directly. Apply cutting oil or flood coolant externally during operation, as this bit does not support internal coolant delivery.