Value Collection 181-3J Solid Carbide Reverse Countersink

Product Description

The VALUE COLLECTION 181-3J is a solid carbide reverse countersink designed for back-chamfering and countersinking operations where standard tooling cannot reach. With a 3/8 inch cutter head diameter and a 1/8 inch pilot hole diameter, this tool delivers precise, clean chamfers on the back face of drilled holes. The 100-degree included angle and bright polished coating reduce friction and improve chip evacuation. At 1/2 inch overall length, the 181-3J is built for tight-access applications in metalworking, fabrication, and machining environments. Three flutes provide stable cutting action on a range of workpiece materials.

This reverse countersink is used in holemaking applications where the entry side of a hole is inaccessible or where a back chamfer is required after a through-hole has been drilled. It is suited for use in production machining, aerospace fabrication, and general metalworking shops. The 181-3J accepts both plain pilot type 185-2 and step pilot type 186-2, expanding its versatility across different hole diameters and pilot configurations.

Key Features

• Solid carbide construction for hardness, wear resistance, and dimensional stability
• 3/8 inch cutter head diameter with 1/8 inch pilot hole diameter
• 100-degree included angle for consistent back-chamfer geometry
• Bright polished coating reduces friction and aids chip flow
• Three-flute design for smooth, stable cutting action
• Compatible with plain pilot 185-2 and step pilot 186-2

Compatibility

Compatible with plain pilot 185-2 and step pilot 186-2 pilot assemblies as specified by the manufacturer.

Installation Notes

This tool is installed and operated by machinists and tooling technicians using standard drill press, CNC machining center, or hand-held power equipment. Secure the pilot firmly before engaging the cutter to prevent walking or chatter. Inspect the pilot hole diameter before use to confirm fit with the 1/8 inch pilot. Follow shop-standard speeds and feeds for carbide tooling in the workpiece material being machined.