Osg 706-5000-090 Carbide Countersink 1/2 in 90 Degree

Product Description

The OSG 706-5000-090 is a single-end carbide countersink designed for producing accurate chamfered seats in a wide range of metals. With a 0.500 inch (1/2 inch) head diameter and a 90-degree included angle, this tool generates clean, burr-minimizing countersinks suitable for flathead fastener seating and edge chamfering. The 1/4 inch straight-cylindrical shank provides secure chuck retention in standard drill presses, CNC machining centers, and hand-held power drills. The bright, uncoated carbide construction delivers hardness and edge retention on demanding workpiece materials. No pilot is included, so the operator controls hole alignment through setup and fixturing.

This countersink is suited to production and maintenance machining environments where consistent chamfer geometry is required. Material compatibility includes alloy steel, aluminum, cast aluminum, cast iron, low-carbon steel, and medium-carbon steel, making it applicable across general metalworking, fabrication shops, and maintenance repair operations. It is a direct single-piece purchase with no minimum order quantity beyond one unit.

Key Features

• 0.500 inch head diameter for standard flathead fastener countersinks
• 90-degree included angle for common fastener seating geometry
• Solid carbide construction provides edge retention on ferrous and non-ferrous metals
• 1/4 inch straight-cylindrical shank fits standard drill chucks and collets
• Bright, uncoated finish — no coating buildup risk on sticky non-ferrous materials
• Single-end, no-pilot design for use in guided fixtures or CNC setups

Compatibility

Designed for use in alloy steel, aluminum, cast aluminum, cast iron, low-carbon steel, and medium-carbon steel workpieces. Compatible with any machine tool or drill press accepting a 1/4 inch straight-cylindrical shank.

Installation Notes

A licensed machinist or qualified tooling technician should set spindle speed appropriate for the workpiece material and tool diameter before operation. Secure the 1/4 inch shank fully in the collet or chuck to prevent runout. Because this tool includes no pilot, use a drill bushing, fixture, or CNC coordinate control to maintain hole location accuracy. Inspect the cutting edge before each use — carbide is hard but brittle, and chipped edges should not be run.