MCFNR2020K12 External Turning Tool Holder

The MCFNR2020K12 External Turning Tool Holder is a rigid and versatile turning holder designed for CNMG 1204 negative inserts. Featuring a 20 × 20 mm shank and a 91° cutting edge angle, this toolholder is optimized for external turning, facing, shoulder machining, and general-purpose roughing and semi-finishing operations. Its robust clamping system provides excellent insert stability under heavy cutting conditions, ensuring reliable performance and long tool life. The holder is designed to withstand high cutting forces, making it suitable for machining carbon steel, alloy steel, stainless steel, cast iron, and other engineering materials. The negative insert configuration allows the use of double-sided CNMG inserts with multiple cutting edges, reducing tooling costs while maintaining excellent productivity. The 91° approach angle makes the holder particularly effective for shoulder turning and facing operations where accurate geometry and consistent cutting performance are required. **Specifications** • Holder Style: MCFNR • Shank Size: 20 × 20 mm • Insert Type: CNMG 1204 • Cutting Edge Angle: 91° • Hand: Right-Hand • Overall Length: 125 mm • Application: External Turning, Facing & Shoulder Machining **Compatible Inserts** • CNMG 120404 • CNMG 120408 • CNMG 120412 **Recommended Diamond Cut Inserts** • CNMG 120408-TM OS8235 • CNMG 120412-TM OS8225 • CNMG 120408-MM OS5105 • CNMG 120408-TM OS8126 The MCFNR2020K12 External Turning Tool Holder is an excellent choice for CNC lathes and conventional turning machines, delivering high rigidity, reliable chip control, and consistent machining performance across a wide range of materials and applications.