Cleveland C12684 Taper Shank Drill Bit 1 in 4MT Hss

Product Description

The CLEVELAND C12684 is a taper shank twist drill bit designed for heavy-duty metal drilling in machine shop and industrial maintenance applications. Built from high-speed steel with an oxide finish, it features a 1-inch diameter, a 4 Morse taper shank for secure spindle engagement, and a 118-degree standard point angle with web thinning for easier penetration at startup. The right-hand spiral flute configuration and regular helix promote efficient chip evacuation during deep-hole drilling. This bit conforms to ASME B94.11M standards, confirming dimensional consistency for professional use.

This bit is suited for general-purpose drilling in ferrous and non-ferrous metals, including mild steel, cast iron, and aluminum. The 4 Morse taper shank seats directly in drill press spindles, milling machine quills, or lathe tailstocks equipped with a 4MT socket. With a 6.375-inch flute length and 12-inch overall length, it handles deep-hole operations that shorter jobber-length bits cannot reach. Machinists, millwrights, and maintenance technicians working with large-bore through-holes will find this length-to-diameter ratio practical for production and repair work alike.

Key Features

• 1-inch diameter with a tight tolerance of +0.0000 to -0.0012 inches for accurate hole sizing
• 4 Morse taper shank for direct mounting in compatible spindles without a chuck
• 118-degree standard point angle with web thinning for reduced thrust at entry
• High-speed steel construction with oxide finish for heat resistance in general-purpose cutting
• Right-hand cut, regular spiral flute for consistent chip removal
• Meets ASME B94.11M dimensional standards

Compatibility

Designed for use in machine tool spindles, drill presses, milling machines, and lathe tailstocks equipped with a 4 Morse taper socket. Suitable for general-purpose drilling in a wide range of metals and materials.

Installation Notes

Installation requires a spindle or adapter with a 4MT bore. Clean and inspect the taper socket and shank for burrs or debris before seating to ensure full contact and prevent slippage under load. Secure the bit using a drawbar or drift as appropriate for the machine design. Verify workpiece is clamped and machine is at the correct speed for the material and diameter before beginning the cut.