Kyocera OTM86139 Indexable Countersink 1.073 in Tcmt

Product Description

The KYOCERA OTM86139 is an indexable countersink designed for precision chamfering and countersinking operations in metal fabrication and machining applications. Built with a carbide tool body, it accepts a single triangular TCMT 3252HQ insert and features an adjustable included angle of 41 degrees, allowing the operator to dial in the correct chamfer geometry for the application. The shank diameter is 3/4 inch with a cylindrical shank profile, and the maximum cutting diameter reaches 1.073 inches. Length of cut is 1.25 inches. This tool is installed by machinists and tool and die professionals working with CNC or manual milling equipment.

The OTM86139 is suited for countersinking operations on ferrous and non-ferrous workpieces in job shop, production machining, and maintenance environments. The CS series design accommodates standard TCMT-style triangular inserts, making insert replacement straightforward when edges dull. Its adjustable included angle adds flexibility when a single tool must serve multiple chamfer-angle requirements across different part programs or fixture setups.

Key Features

• Accepts one TCMT 3252HQ triangular indexable insert for consistent edge geometry
• Adjustable included angle of 41 degrees for flexible chamfer setup
• Carbide tool body for rigidity and resistance to wear
• Cylindrical 3/4 inch shank for compatibility with standard tool holders and collets
• 1.25 inch length of cut supports a range of countersink depths
• Lightweight at 0.2 pounds, minimizing spindle load during operation

Compatibility

Designed for use with TCMT 3252HQ triangular indexable inserts. Part of the KYOCERA CS series indexable countersink line. Verify insert grade and geometry against your workpiece material before ordering.

Installation Notes

Installation is performed by a qualified machinist. Secure the cylindrical shank in a compatible end mill holder, collet chuck, or tooling block rated for the shank diameter before mounting in the spindle. Power down and lock out the machine before changing inserts or adjusting the included angle setting. Follow the tool manufacturer and machine builder guidelines for spindle speed and feed rate based on workpiece material and insert grade.