Zund R34 CNC Spiral Milling & Router Bit (Part #3910424) is a specialized, micro-grain solid tungsten steel tool engineered for high-precision micro-milling, fine engraving, and detailing of hard brass and other dense non-ferrous alloys. Within Zund’s dedicated non-ferrous metal tooling family (which ranges from R31 to R35), the R34 is optimized for highly intricate geometries and tight corner radiuses where larger bits would cause material deflection or fracture. 

Core Technical Specifications
Part Number: 3910424
Milling Depth (Cut Length): 3.0 mm
Shank Diameter: 3.0 mm
Geometric Designation: Zund R34
Routing Diameter (Cut Ø): 1.0 mm

Flute Configuration: Triple-flute (Z=3) layout for optimized chip load balancing
Spiral Type: Right-hand up-cut spiral to continuously clear heavy metal fragments out of the cut channel

Equipment Integration and Performance
Tooling Modules: It operates flawlessly inside high-frequency spindles, such as the Zund Universal Routing Tool (URT) capable of spin rates up to 80,000 RPM.
Automation Compatibility: The tool can be ordered as a standard cylinder or as an "A" variant (R34-A) equipped with a pre-set stop ring. This stop ring is mandatory if you utilize the Zund Automatic Router Bit Changer (ARC) system for automatic bit pickup and touchless initialization.
Material Optimization: The Z=3 triple-flute design ensures that even at a ultra-small 1mm cutting width, the tool maintains maximum rigidity against the high shear stresses of machining brass, preventing tool breakage while yielding a burr-free edge.