EGBSK Oil-Free Ejector Leader Bushings for High Temperature Long Guide, Copper Alloy

This copper-alloy ejector leader bushing is used in large mold tooling to keep ejection motion straight and stable during high-temperature cycles. In die casting platforms, it acts as a long-guide leader bushing that aligns the ejector system and reduces side load, helping maintain consistent stroke repeatability.

Common scenarios include precision die casting for high-temperature parts where conventional oils can break down, contaminate product surfaces, or require frequent maintenance. The oil-free/dry-lubrication design is suited to situations where reliable sliding must be maintained across many cycles.

• Automotive and industrial die-cast components: supports controlled ejection under hot-runner and rapidly cooling conditions.
• Thermal-cycle heavy molds: maintains stable leader guidance when lubricant performance degrades.
• Repeat production runs: copper alloy wear behavior helps support long service life for guided ejectors.

The EGBSK variant is manufactured from a copper alloy selected for dry sliding stability in hot mold environments. Copper-alloy leader bushings typically provide good anti-seizure behavior and favorable wear characteristics under conditions where liquid lubricants are unreliable or undesirable.

• Material behavior: copper-alloy construction supports consistent sliding and mitigates stick-slip during repeated thermal cycling.
• Heat treatment: the provided data does not specify a specific heat-treatment state (e.g., quench & temper, nitriding). Selection should follow the supplier’s manufacturing control for this series to achieve the intended wear/toughness balance.
• Hardness/wear trade-offs: copper alloys generally trade higher structural hardness for better conformability and friction stability in dry service compared with harder tool steels.

Where higher hardness is required, tool-steel guide bushings may offer greater abrasive resistance, but may not provide the same dry-lubrication performance under lubricant-avoidance requirements.

To select the correct EGBSK oil-free leader bushing, match the inner diameter (d) and the length (L) to your ejector/guide pin and the mold’s required guidance span. Available d values are 20, 25, 30, 35, 40, and 50 mm, and available L values are 33, 38, 43, 53, and 68 mm.

• Step 1: Choose the bushing with the closest d to your leader/ejector diameter per the mold design drawing.
• Step 2: Select L to cover the required guide length in the long-guide region, ensuring adequate support for straight ejection.
• Step 3: Confirm fit and clearances in your system design. This data lists only nominal d and L; dimensional tolerances are not provided here, so your final fit should follow your bushing-to-shaft tolerance specification from the series documentation.

Dimensions are configurable only within the listed discrete d and L options; outside these ranges, a different size or series is required.