Self-Lubricating Ejector Bushings - Bronze

These self-lubricating ejector bushings are used in large mold tooling wherever smooth ejector guidance is required without routine oiling. They fit into ejector guide assemblies to stabilize alignment and reduce stick-slip during high-cycle operation.

• Die casting tooling: bronze, oil-free guidance supports consistent ejector motion in hot work environments where lubrication can be difficult to maintain.
• Automotive and appliance progressive dies: use them to keep leader pins centered and to limit frictional wear during repetitive part ejection cycles.
• Injection molds with long travel ejectors: the bushing length range helps maintain guidance over the stroke, improving motion smoothness across the molded cycle.

The oil-free copper alloy bronze construction is suited to applications that prioritize reduced maintenance while still delivering low-friction ejector contact for reliable cycle-to-cycle behavior.

The bushing body is made from an oil-free copper alloy bronze designed for self-lubricating ejector guidance. In this type of bronze, the wear surface provides low-friction motion against the mating ejector/leader while minimizing the need for external lubrication.

• Wear resistance vs. toughness: bronze typically balances good anti-wear behavior with moderate toughness, making it well-suited for sliding guidance under repeated cycles.
• Heat treatment: the provided specifications do not include a defined hardness level or heat-treatment state, so selection should be validated against the mating component requirements and expected surface pressures.
• Material comparison: if your design requires different sliding characteristics, the primary decision point is whether an oil-free bronze guidance surface is preferred over alternative bearing alloys or steel bushings.

Confirm hardness, surface finish, and operating loads during pre-release tooling validation, since no HRC value is specified in the available data.

Select the bushing by matching the inner diameter (d) to the ejector/leader pin and the outside diameter (A) to the guide bore in the mold component. Then choose length (L) to cover the required guidance zone inside the mold base or die-casting tooling.

• Available inner diameter d (mm): 20, 25, 30
• Available outside diameter A (mm): 26, 32, 38
• Available length L (mm): 37, 45

Start by verifying the ejector leader diameter and selecting the corresponding d so the bushing clears the moving part while maintaining stable guidance. Next, ensure the A dimension matches the housing/guide bore size; because tolerances are not provided in the input data, use your standard mold-fit practice (clearance and alignment checks) to define running fit and to prevent binding.

Dimensions are offered as fixed discrete sizes (no configurable ranges stated), so select the closest match to cavity/core guidance requirements.