MDJNR/L Turning Tool Holder | 93° M-Type Lathe Tooling for DNMG, DNMA & DNMM Inserts

High-Performance MDJNR/L Tool Holder with 93° Lead Angle

The MDJNR/L tool holder stands out among professional CNC turning tool holder types due to its unique 93-degree geometry. This specific approach angle allows the tool to perform both longitudinal turning and facing operations while maintaining a small clearance between the tool and the workpiece. This design significantly reduces the risk of vibration, making it a preferred lathe turning tool holder for achieving superior surface finishes on various alloy steels.

Full Compatibility with DN-Series Inserts

The MDJNR/L is the primary choice for 55-degree diamond inserts. Its precision-machined pocket is compatible with a wide range of DN-style geometries to suit your specific material requirements:

• DNMG Inserts (e.g., DNMG 1506 / DNMG 442): The industry standard for general-purpose steel, stainless steel, and high-temp alloy turning.

• DNMA Inserts: Ideal for machining cast iron (ISO K) where flat-top stability and edge strength are required.

• DNMM Inserts: Reinforced with a heavy-duty chipbreaker for high-feed roughing and interrupted cuts.

Rigid M-Type Multi-Lock Clamping System

Stability during profiling is non-negotiable. The MDJNR/L utilizes a specialized M-type clamping mechanism that locks the lathe insert holder via both a top clamp and a center pin. This double-lock system prevents any insert micro-movement during directional changes, ensuring consistent accuracy. Compared to standard screw-down systems, this rigid setup extends the life of your DNMG tool holder components and carbide inserts.

Specifications Table

Q: Why choose a 93° MDJNR/L instead of a 90° or 45° holder?
A: The 93° approach angle of the MDJNR/L provides a slight lead that allows for “back-turning” and profiling without the tool heel rubbing against the workpiece. It is much more versatile for complex shapes than a 45° roughing holder and offers better clearance for facing than a standard 90° turning tool holder.

Q: Is the MDJNR/L suitable for finishing or roughing?
A: It excels at both. The M-type double clamp provides the rigidity needed for roughing with DNMM inserts, while the 55-degree diamond shape of the DNMG insert is naturally suited for high-precision finishing and intricate profiling.

Q: Does this holder require special maintenance for the M-type clamp?
A: The M-type system is very durable. However, to maintain the precision of your lathe tool holder, we recommend cleaning the insert pocket and checking the clamp screw for wear regularly, especially when machining abrasive materials like cast iron with DNMA inserts.