Value Collection 181-11J Reverse Countersink Solid Carbide

Product Description

The VALUE COLLECTION 181-11J is a solid carbide reverse countersink designed for back-chamfering and countersinking operations from the reverse side of a workpiece. It features a 1 inch cutter head diameter and a 5/16 inch pilot hole diameter, with a 100-degree included angle and a 7/8 inch overall length. The 3-flute carbide construction provides clean, consistent cutting in metalworking and fabrication applications. The bright, uncoated finish is standard for general-purpose carbide tooling. This tool is intended for use by machinists, tool and die makers, and precision fabricators working with drill presses, CNC machines, or manual milling setups.

This reverse countersink is used in holemaking applications where a standard countersink cannot access the chamfer location from the front side. It is well-suited for deburring, chamfering bolt holes, and creating countersunk seats on the underside of plates, brackets, and structural components. The right-hand cutting direction is standard for conventional spindle rotation. It is compatible with plain pilot style 185-6 and step pilot style 186-13, allowing use with the appropriate pilot for the application.

Key Features

• Solid carbide construction for hardness and wear resistance in demanding holemaking operations
• 100-degree included angle for standard reverse countersinking geometry
• 1 inch cutter head diameter with 5/16 inch pilot hole diameter
• 3-flute design for smooth, accurate chamfering
• Right-hand cutting direction compatible with standard spindle rotation
• Bright, uncoated finish suitable for general-purpose use

Compatibility

Compatible with plain pilot 185-6 and step pilot 186-13. Designed as an OEM-style replacement or direct-use reverse countersink for standard holemaking setups requiring back-chamfer capability.

Installation Notes

This tool is installed and operated by machinists and fabricators using drill presses, CNC machining centers, or manual mills. Ensure the spindle is fully stopped and the machine is powered down before changing or securing the tool. Use the correct pilot type for the pilot hole diameter to maintain concentricity during cutting. Follow applicable shop safety standards and machine tool manufacturer guidelines for speeds and feeds when using carbide tooling.