Cleveland C24259 Taper Pin Reamer No. 4 Hss 6 Flute

Product Description

The CLEVELAND C24259 is a No. 4 taper pin reamer designed to size and finish tapered holes to accept No. 4 taper pins. Manufactured from high-speed steel (HSS), it delivers the hardness and wear resistance needed for general-purpose reaming in ferrous materials. The reamer features a straight flute geometry with 6 flutes, a small end diameter of 0.2071 inches, and a large end diameter of 0.2604 inches. Overall length is 4.0625 inches with a flute length of 2.5625 inches. This tool is installed and used by machinists, maintenance technicians, and tool-room professionals performing precision hole finishing operations.

This reamer is suited for use on cast iron, carbon steel, and alloy steel workpieces in both production and maintenance environments. Typical applications include enlarging and finishing tapered holes in shafts, hubs, levers, and mechanical assemblies where taper pins are used for positive location or locking. The 1:48 taper rate matches the standard taper pin specification, ensuring proper fit when used with corresponding taper pins. A 17/64-inch square shank provides positive drive engagement in standard reamer holders and tap wrenches.

Key Features

• High-speed steel construction for hardness and wear resistance in ferrous materials
• 6 straight flutes for consistent chip evacuation and smooth surface finish
• 1:48 taper rate matches standard No. 4 taper pin specification
• Bright uncoated finish suitable for general-purpose applications
• 17/64-inch square shank for positive drive in standard holders
• Right-hand cut geometry for conventional reaming operations

Compatibility

Designed as an OEM-style replacement or direct-use reamer for No. 4 taper pin applications in standard taper pin hole finishing. Compatible workpiece materials include cast iron, steel, and steel alloy per CLEVELAND Series 657 specifications.

Installation Notes

Taper pin reamers are used by machinists and maintenance technicians using manual tap wrenches or low-speed machine spindles. Secure the workpiece fully before reaming and apply appropriate cutting fluid to extend tool life and improve surface finish in steel and cast iron. Use progressive passes to approach final size; avoid forcing the reamer, which can deflect the tool or damage the workpiece surface. Confirm hole size with the corresponding taper pin gauge before driving the final pin.