Undersized Tapping Electrodes - Copper, Tungsten-Copper

These undersized tapping electrodes are used in injection mold and mold-accessory tooling where post-processing or precision thread formation is required for fasteners, inserts, or alignment features. In an automotive connector mold, they support stable screw-thread creation in sprue-adjacent or gating-related components, helping maintain repeatable assembly and reducing rework caused by inconsistent thread geometry.

For medical device housings and precision enclosures, through-hole electrode setups help match the tapping layout to the required mounting pattern. The copper and tungsten-copper variants are suited for such applications because they promote reliable tapping contact and help limit cutting wear, which is critical when producing high volumes with tight dimensional control.

• Through-hole configurations align electrode access with the tapping setup.
• Undersized geometry supports consistent thread formation for reliable assembly.

The electrode materials are offered as tough pitch copper or tungsten-copper. Tough pitch copper provides good electrical and thermal conductivity for stable process behavior during tapping-related EDM/electrode operations, supporting consistent thread generation.

Tungsten-copper is a composite designed for improved performance under wear conditions. Compared with copper, tungsten-copper typically offers higher wear resistance but with different thermal/mechanical behavior, so it is selected when tooling protection and service life are primary concerns.

• Tough pitch copper: chosen for stable thread formation and process conductivity.
• Tungsten-copper: chosen for better wear resistance to help reduce tool wear and downtime.

Heat treatment and exact hardness (HRC) are not provided in the supplied specifications; final selection should be confirmed with your process window and expected duty cycle.

Selection is primarily driven by the screw diameter parameter M (Screw diameter): 3 ~ 20 mm. Choose an electrode whose undersized tapping geometry is intended to produce the target thread size for your tapping operation.

Next, confirm the through hole type requirement: set No for setups that do not require through-hole access, or Yes when the electrode must pass through for your tapping access path and fixture design.

• Match cavity/core features: align the electrode’s M range to the expected tap’s nominal diameter and ensure adequate clearance for tool engagement.
• Tolerance/fit: because the product is undersized by design to achieve stable thread formation, verify your tapping allowance (tap drill size, thread class, and assembly requirements) with a trial cut to confirm final fit.
• Configuration: material (tough pitch copper vs. tungsten-copper) is the main adjustable choice; dimensioning is constrained by the M range and through-hole selection.