Dormer Pramet 5973206 Solid Pilot Counterbore 0.2561in 3 Flute Hss

Product Description

The DORMER PRAMET 5973206 is a solid pilot counterbore designed for precise enlarging and finishing of drilled holes to accept fastener heads, dowels, and similar hardware. Built from high speed steel, this 3-flute tool delivers clean, concentric cuts in a range of workpiece materials. It features a 0.2561-inch cutting diameter and a 0.134-inch integral pilot that registers in the existing hole to maintain accurate alignment. The 0.197-inch shank diameter fits standard machine tool holders, and the 2.8-inch overall length suits most benchtop and floor-standing drill press and milling setups.

This counterbore is suited for machine shops, maintenance and repair operations, and production environments where precise bolt-hole finishing is required. It is appropriate for use in manual drill presses, milling machines, and CNC machining centers when used with a compatible holder. The integral pilot design eliminates the need for separate pilot pins, reducing setup time and part count during high-volume or repetitive counterboring operations.

Key Features

• 0.2561-inch cutting diameter for accurate fastener seat sizing
• 0.134-inch solid integral pilot for self-centering alignment
• 3-flute geometry supports smooth chip evacuation and consistent finish
• High speed steel construction for durability across general-purpose materials
• 0.197-inch shank diameter fits standard tool holders
• 2.8-inch overall length accommodates common drill press and milling setups

Compatibility

Designed as an OEM-style replacement or direct-use solid pilot counterbore for standard drill press, milling machine, and CNC machining center applications requiring a 0.2561-inch counterbore diameter with a 0.134-inch pilot.

Installation Notes

Installation and operation should be performed by a qualified machinist familiar with rotating cutting tools. Secure the shank firmly in a compatible collet or chuck before use, and ensure the workpiece is clamped to prevent movement. Always set spindle speed appropriate to the workpiece material and tool diameter per standard machining practice before engaging the cut. Inspect the pilot and cutting edges for wear or damage before each use.