T2139 R12.5 is a 55 HRC carbide finish ball mill insert

Description

T2139 R12.5 is a 55 HRC carbide finish ball mill insert designed for precision CNC finishing operations in materials up to 55 HRC. This insert is engineered to deliver excellent surface finish, dimensional accuracy, and stable cutting performance in demanding applications such as die & mould machining, automotive components, aerospace parts, and precision engineering. The R12.5 ball radius geometry enables smooth profiling and consistent contact during finishing passes, making it ideal for 3D contours, curved surfaces, and cavity finishing.

Manufactured from premium carbide substrate and optimized for 55 HRC machining, the T2139 insert offers superior wear resistance, edge toughness, and thermal stability. Its geometry is tuned to reduce cutting forces and vibration, allowing stable milling at higher spindle speeds while maintaining surface integrity. This results in lower tool wear, improved tool life, and repeatable finishing quality across batch production.

The T2139 R12.5 finish ball mill insert is commonly used in indexable finish ball mills, where accurate seating and consistent edge engagement are critical. The insert design supports smooth chip flow and controlled cutting action, minimizing burr formation and improving the final surface finish—often reducing or eliminating secondary polishing operations. It performs reliably on P20 steel, stainless steel, EN8/EN19, alloy steels, and similar medium-hard materials typically machined up to 55 HRC.

This insert is frequently searched as finish ball mill insert, carbide ball milling insert, CNC finishing insert, indexable ball nose insert, precision carbide tools India, and industrial cutting tools suppliers, aligning with buyer intent for high performance end mills and CNC cutting tools manufacturers. Its application-focused design makes it suitable for high-precision mould cavities, fillets, and complex profiles where consistency and finish quality matter most.

By delivering stable cutting, excellent finish, and long insert life, the T2139 R12.5 helps CNC shops improve productivity, reduce downtime, and achieve reliable finishing results in modern machining environments.