EGBPK Oil-Free Ejector Leader Bushings for High Temperature - Copper Alloy

EGBPK oil-free ejector leader bushings are used in large mold tooling where an ejector leader must stay aligned through repeated cycling and elevated temperatures. A common scenario is die-casting and high-throughput automotive component molds, where consistent leader guidance helps prevent side loading on ejector systems.

In contamination-sensitive applications—such as molds used for parts that must avoid oil carryover—the oil-free copper alloy bushing supports motion without requiring ongoing lubrication. This helps maintain stable guidance during thermal expansion cycles.

Because this variant is an oil-free copper alloy design, it is well suited for leader functions that demand low-friction movement and alignment stability under heat, reducing the risk of sticking or misalignment that can occur when lubrication becomes unreliable.

• Automotive connector/enclosure tooling with high clamp pressure and repeated ejector strokes
• Die-casting molds requiring reliable leader alignment at elevated temperatures
• Clean-molding environments where lubrication contamination must be minimized

This bushing is specified as an EGBPK oil-free type made from a copper alloy. Copper alloys are selected for their frictional behavior in guide applications, supporting smooth movement while avoiding lubrication-dependent performance.

For precision mold guides, these bushings are typically manufactured in a hardened, wear-resistant condition appropriate for sliding contact. While specific hardness/heat-treatment values are not provided in the available data, the engineering intent is a balance of wear resistance and enough toughness to withstand continuous leader motion.

• Wear resistance: aimed at maintaining guide alignment under repeated cycles
• Toughness trade-off: optimized so the bushing can tolerate operational shocks from ejector movement
• Oil-free operation: designed to perform without relying on lubricants, which is useful at high temperature

If your project requires higher-load guidance, compare against steel-based guide bushings; the copper alloy approach prioritizes low-friction, oil-free sliding behavior rather than maximum hardness.

Correct selection is driven by matching the inner diameter (d) and the guide section length designated as ℓ (Dh6 section length). Available ranges for this series are d = 13 ~ 50 mm and ℓ = 13, 15, 20, 25, 30 mm.

To size for your mold, identify the leader pin/shaft diameter required by the ejector leader design, then select the bushing with the closest matching d within 13–50 mm. Next, choose the ℓ that provides the intended guidance engagement length, limited to the provided options (13/15/20/25/30 mm).

• d (mm): choose within 13 ~ 50 to fit the leader diameter
• ℓ (Dh6 section length): select from 13, 15, 20, 25, 30 based on cavity/core space
• Fit/tolerance: ℓ is defined as a Dh6 section length, so coordinate with the leader/pin and surrounding bore tolerances to avoid excessive clearance or interference