MTQNR/L External Turning Tool Holder

MTQNR Tool Holder with 105° Angle for Undercutting

The MTQNR/L series is a specialized external turning tool holder designed to solve complex geometry challenges. Featuring a specific 105° entering angle (15° lead angle clearance), this tool provides the necessary clearance to perform “back turning” and undercutting operations that standard 93° tools cannot reach.

Optimized for Profiling with TNMG Inserts

This holder is engineered to seat TNMG inserts (Triangle). The combination of the economical 6-edge insert and the 105° geometry makes it perfect for copy turning (profiling) applications where the tool needs to navigate descending contours or create relief grooves without interference from the tool body.

Rigid M-Type Stability

Profiling and undercutting can generate unstable cutting forces. The MTQNR tool holder utilizes the robust M-Type Double Clamping System. By securing the insert with both a lock pin and a top clamp, it ensures the insert remains rigid during multi-directional cutting, providing excellent surface finish and dimensional accuracy.

ISO Code Naming Rules

Here is the breakdown of the MTQNR/L code, specifically highlighting the angle parameter:

FAQ 

Q1: What is the main use of the 105° entering angle on the MTQNR?
A: The 105° angle allows the tool to cut “backwards” or undercut surfaces (creating a relief) without the back of the tool holder hitting the workpiece. It is essential for specific profiling shapes.

Q2: Does the MTQNR use standard TNMG inserts?
A: Yes. Despite the special 105° angle of the holder, it uses standard ISO TNMG inserts. This means you don’t need to buy special inserts just for this holder; you can use the same ones as your MTJNR or MTENN holders.

Q3: Can I use this for heavy roughing?
A: It is possible, but usually, an MTJNR (93°) or MSSNR (45°) is better for heavy roughing due to better force distribution. The MTQNR is best reserved for profiling and finishing complex shapes where its geometry is required.