Precision Twist Drill 5999518 Taper Shank Drill Bit 4MT

Product Description

The PRECISION TWIST DRILL 5999518 is a taper shank drill bit designed for heavy-duty drilling in metal, steel, and similar materials. It carries a 1.1563-inch (1-5/32 inch) cutting diameter and mounts via a 4MT (Morse Taper No. 4) shank, making it compatible with drill presses, lathes, and milling machines equipped with a matching taper socket. The overall length is 12.875 inches with a 7.25-inch spiral flute. Manufactured from high speed steel with an oxide finish, it delivers consistent performance across general-purpose metal drilling applications. The 118-degree standard point with web thinning reduces entry force and helps the bit start accurately without a center punch on flat stock.

This bit is suited for machine shop environments, industrial maintenance, and fabrication work where large-diameter holes are required in a single pass. The 4MT shank seats directly in compatible spindles without a drill chuck, transferring torque efficiently for larger diameters. Right-hand cutting direction and a regular spiral flute make it appropriate for most conventional drill press and lathe tailstock setups. It conforms to ANSI standards and is rated for general-purpose tool performance per its Series 209 classification.

Key Features

• 1.1563-inch (1-5/32 inch) cutting diameter for large-bore drilling in a single pass
• 4MT Morse Taper shank seats directly in compatible spindle sockets without a chuck
• High speed steel construction with oxide finish for general-purpose metal drilling
• 118-degree standard point with web thinning for reduced thrust and accurate entry
• 7.25-inch spiral flute length with regular right-hand spiral for efficient chip evacuation
• ANSI-compliant Series 209 — consistent with standard tooling interchangeability requirements

Compatibility

Designed for use in drill presses, lathes, and milling machines fitted with a No. 4 Morse Taper (4MT) spindle socket. Coolant-through operation is not supported.

Installation Notes

Installation and removal of taper shank tooling should be performed by a qualified machinist or toolroom technician. Power down and lock out the machine before seating or drifting the bit. Use a proper drift key in the spindle slot to remove the bit — never strike the bit directly. Verify the taper socket is clean and free of chips or burrs before insertion to ensure full seating and safe torque transfer.