Kyocera KTNSR1212K-16 – External Threading Toolholder (THC03972)

The Kyocera KTNSR1212K-16 (Item no. THC03972) is a precision external threading toolholder designed for reliable thread turning on lathes and CNC machines. With a compact 12 mm × 12 mm square shank and right-hand orientation, this toolholder provides excellent rigidity and stability for external threading operations using 16-size threading inserts. Its robust construction and precision ground geometry help ensure accurate thread profiles and consistent performance across a wide range of materials. 

This toolholder is ideal for general external threading applications requiring repeatable accuracy and secure insert clamping without the use of internal coolant.

Key Features & Benefits

• 12 mm × 12 mm square shank — compact yet rigid for stable cutting. 
• Right-hand orientation — suitable for standard threading operations. 
• Designed for external threading with 16-size inserts. 
• Precision geometry — helps maintain accurate thread form and surface finish. 
• No internal coolant — simplified design for standard machining setups. 
• Durable steel construction — provides consistent performance in production environments. 

Technical Specifications

• Item No: THC03972 
• Model: KTNSR1212K-16 
• Shank Width (B): 12 mm 
• Shank Height (H): 12 mm 
• Cutting Direction: Right-hand 
• Compatible Insert Size: 16 (e.g., 16ER external threading inserts) 
• Total Length (OAL): 125 mm 
• Head Length (LH): 18 mm 
• Internal Coolant: No 
• Usage: External threading on general engineering materials