Alvord Polk 03029 Solid Pilot Counterbore 0.789in Dia Hss

Product Description

The ALVORD POLK 03029 is a solid pilot counterbore designed for precision counterboring operations in metal fabrication and mechanical assembly work. Built from high speed steel (HSS) with a bright, uncoated finish, this tool delivers a 0.789-inch counterbore diameter paired with a 0.531-inch oversize pilot diameter for accurate bore alignment. The straight-cylindrical shank measures 0.5 inches in diameter and the tool runs 7.5 inches overall length, giving machinists and tool-and-die tradespeople the reach needed for deeper setups. Forward cutting direction makes it compatible with standard drill press and milling machine applications. It is installed and operated by machinists, maintenance mechanics, and precision tooling technicians.

This counterbore is sized specifically for 1/2-inch socket-head cap screws, making it a direct-fit tool for creating clean, flat-bottomed recesses that allow fastener heads to sit flush or below a workpiece surface. It is well suited for use in structural steel fabrication, fixture building, machine maintenance, and precision assembly environments where consistent counterbore depth and diameter are critical. The oversize pilot engages the existing drilled hole to guide the cutter and reduce chatter during the cut.

Key Features

• 0.789-inch counterbore diameter sized for 1/2-inch socket-head cap screws
• 0.531-inch oversize pilot diameter for positive hole alignment and reduced chatter
• High speed steel construction for durability across a range of ferrous and non-ferrous materials
• Straight-cylindrical 0.5-inch shank fits standard drill chucks and collet holders
• 7.5-inch overall length provides reach for deeper workpiece setups
• Bright, uncoated finish - forward cutting direction for use in standard rotary equipment

Compatibility

Designed for use with 1/2-inch socket-head cap screws. The 0.5-inch straight-cylindrical shank seats in standard 1/2-inch drill chucks or collet systems on drill presses and milling machines.

Installation Notes

This tool is installed and operated by machinists and maintenance mechanics using drill presses, milling machines, or handheld magnetic-base drills. Secure the shank firmly in the chuck or collet before operation and verify the pilot fits the pre-drilled pilot hole without excessive play. Use appropriate cutting fluid for the workpiece material to extend tool life and improve finish quality. Always bring the spindle to a full stop before measuring depth or inspecting the counterbore.