Precision Twist Drill 5999508 Taper Shank Drill Bit

Product Description

The PRECISION TWIST DRILL 5999508 is a taper shank drill bit designed for heavy-duty drilling in metal fabrication, machining, and industrial maintenance applications. Built from high speed steel with an oxide finish, this bit measures 1.375 inches in diameter with a 4MT (Morse Taper 4) shank for rigid, positive engagement in compatible spindles and tailstocks. The 118-degree standard point geometry and web-thinned tip reduce thrust and improve penetration at the start of the cut. A regular spiral flute evacuates chips efficiently during deep drilling operations. This bit is sized and constructed for use by machinists, tool and die workers, and maintenance mechanics working with drill presses, lathes, or radial arm drill presses.

This bit is suited for general-purpose drilling in ferrous and non-ferrous metals, including steel, cast iron, and aluminum. The 4MT taper shank seats directly into machines equipped with a No. 4 Morse Taper socket, eliminating the need for a separate chuck in most production and job-shop setups. The Series 209 designation and ANSI standards compliance confirm this bit meets recognized dimensional and performance criteria for taper shank tooling in North American shop environments.

Key Features

• 1.375-inch (1-3/8 inch) drill diameter for large-bore applications
• No. 4 Morse Taper (4MT) shank for direct spindle mounting
• High speed steel construction with oxide finish for general-purpose metal cutting
• 118-degree standard point angle with web-thinned tip to reduce entry thrust
• Regular right-hand spiral flute, 8.875 inches long, for efficient chip evacuation
• ANSI-compliant Series 209 tooling, no coolant-through required

Compatibility

Designed for use in drill presses, lathes, and radial arm drilling machines equipped with a No. 4 Morse Taper (4MT) spindle or tailstock socket. No specific OEM model compatibility is stated by the manufacturer for this bit.

Installation Notes

Installation requires a machine spindle or tailstock with a No. 4 Morse Taper socket. Power down and lock out the machine before seating or removing the taper shank. Clean both the shank and the socket bore of chips, oil, and debris before insertion to ensure full taper contact. A draw bar or drift key should be used per machine manufacturer guidelines when securing or ejecting the bit.