EGBB Ejector Leader Bushings for Ball Bearing Retainer

EGBB ejector leader bushings are used in injection mold tooling to control the motion of the ejector leader that drives a ball bearing retainer during ejection. In large-mold systems, they help keep leader travel aligned, reducing side-load and preventing mis-positioning of the retainer components.

• Automotive and industrial connector molds: Use in ball retainer ejector mechanisms where repeatable stroke guidance is needed for stable part release across high cycle rates.
• Appliance and electronics housings: Suitable for molds that require smooth ejector leader guidance to minimize wear debris and maintain consistent ejection behavior over repeated operations.
• Large die-casting component molds: Helps maintain accurate leader alignment in long or stepped motion paths, using the available Dh6 section length options to match the leader engagement zone.

These configurations are suited because the bushing is dimensioned to support a controlled fit over a specified leader pin diameter range (8–30 mm) and provides selectable leader engagement lengths (13–25 mm).

The provided product data specifies the geometry and fit-related dimensions (inner diameter range and a Dh6 section length designation) but does not list a steel grade or heat-treatment condition. For accurate selection, confirm the supplied steel material and hardness from the manufacturer’s datasheet or request material certificates.

When selecting leader guidance bushings for ejector systems, engineers typically balance wear resistance against toughness to handle cyclical sliding and shock loading during ejection.

• If a hardened tool steel variant is used, guidance performance typically improves under abrasive contact; however, excessive brittleness can reduce tolerance stability under impact.
• If a nitrided surface is specified, it usually enhances surface wear resistance while retaining a tougher core.
• If multiple materials are offered, compare hardness (HRC), expected wear life, and any specified post-processing (e.g., quench & temper, nitriding) before finalizing the design.

To select the correct bushing, match the bushing inner diameter (d) to your leader pin outer diameter. This product covers d = 12–34 mm and supports an applicable leader pin diameter = 8–30 mm, so choose the bushing that provides the required clearance and guidance for your specific leader pin size.

• Step 1: Identify the leader pin diameter and select the bushing whose fit accommodates that diameter within the provided range (8–30 mm).
• Step 2: Select the engagement length ℓ (Dh6 section length) from the available options: 13, 15, 20, or 25 mm, based on the required contact length in the cavity/core assembly.
• Step 3: Verify fit and alignment requirements. The use of Dh6 indicates a tolerance-controlled section; ensure the housing bore and leader pin machining are compatible to maintain stable guidance without binding.

All listed dimensions (d range and ℓ options) are fixed product specifications; configure your design by choosing the appropriate variant rather than resizing the bushing.