Alvord Polk 03084 Solid Pilot Counterbore Hss 0.5315in

Product Description

The ALVORD POLK 03084 is a solid pilot counterbore designed for precision boring operations in machine shops, fabrication environments, and maintenance settings. Built from high speed steel (HSS) with a bright uncoated finish, this tool delivers clean, accurate counterbores for socket-head cap screw seat preparation. The straight-cylindrical shank measures 0.5 inches in diameter, and the overall length of 6.5 inches provides reach for a variety of workpiece configurations. The 0.5315-inch counterbore diameter and 0.3346-inch pilot diameter are machined to standard tolerances, keeping seat geometry consistent across production runs. Machinists and maintenance technicians working in metalworking trades rely on this style of tool for repeatable, concentric results.

This counterbore is suited for use in manual mills, drill presses, and CNC machining centers where socket-head cap screw counterboring is required. It is compatible with 0.315-inch (8.00 mm) socket-head cap screws, making it appropriate for both inch and metric fastener applications in that size range. Typical use scenarios include fixture building, machine assembly, and structural fabrication work where fastener heads must sit flush or below the workpiece surface.

Key Features

• Counterbore diameter of 0.5315 inches for socket-head cap screw seating
• Standard pilot diameter of 0.3346 inches for concentric bore alignment
• High speed steel construction for durability across a range of ferrous and non-ferrous materials
• Straight-cylindrical shank at 0.5 inches diameter for secure chuck or holder retention
• 6.5-inch overall length provides extended reach in deeper workpieces
• Forward cutting direction with bright uncoated finish - no coating to degrade at standard HSS operating speeds

Compatibility

Designed for use with 0.315-inch (8.00 mm) socket-head cap screws. Fits standard straight-bore tool holders and drill chucks with 0.5-inch capacity. Intended as a standard-size pilot counterbore for general metalworking applications.

Installation Notes

Installation of this counterbore should be performed by a qualified machinist or trained maintenance technician. Secure the shank firmly in a properly sized chuck or milling holder before operation, and verify runout before cutting. Power down and lock out all machine motion before changing or adjusting the tool. Follow all applicable shop safety protocols and machine manufacturer guidelines for feed rate and speed selection based on workpiece material.