Kyocera S20Q-CTUPR11-27 Internal Boring Bar – Ø20 mm x 27mm

The Kyocera S20Q-CTUPR11-27 internal turning toolholder is a precision-engineered boring bar designed for internal machining applications, including boring, facing, and internal profiling. With its robust cylindrical shank and right-hand configuration, this toolholder ensures excellent stability and accuracy when machining internal diameters.

Designed to accommodate positive triangular inserts (TPGN style), this holder offers smooth cutting action with reduced cutting forces, making it ideal for finishing and light to medium-duty operations. The compact design allows access to smaller bore diameters, while the rigid steel construction minimises vibration and enhances surface finish quality in precision machining environments.

Key Features & Benefits

• Internal turning boring bar for precision internal machining
• Compatible with TPGN-style positive inserts
• Right-hand configuration for standard internal turning operations
• 20 mm shank diameter for rigidity and stability
• Suitable for small bore machining (minimum bore Ø27 mm)
• Positive insert geometry for reduced cutting forces
• Ideal for finishing and light to medium-duty applications
• Reliable performance in CNC and conventional lathes

Technical Specifications

• Brand: Kyocera
• Model: S20Q-CTUPR11-27
• Item Number: THC03678
• Product Type: Internal Turning Boring Bar
• Insert Type: TPGN (Triangular, Positive)
• Insert Size: 11
• Shank Diameter: 20 mm
• Minimum Bore Diameter: 27 mm
• Hand: Right
• Material: Steel
• Total Length: 180 mm
• Head Length: 40 mm
• Clearance Angle: 11°
• Insert Included Angle: 60°
• Rake Angle: +5°
• Tool Cutting Edge Angle: 93°
• Cutting Edge Length: 10.998 mm
• Corner Radius: 0.4 mm
• Insert Thickness: 3.18 mm
• Internal Coolant: No

Kyocera is globally recognised for high-performance cutting tools, offering superior reliability, precision, and long tool life across a wide range of machining applications.