EGBNZ Type Oil-Free Ejector Leader Bushings Long Guide SUJ2 Bearing Steel

This oil-free ejector leader bushing is used in injection mold tooling where the ejector system must maintain stable alignment over many cycles. The long-guide EGBNZ geometry is well-suited for large-part automotive connector molds, where repeated ejection can otherwise introduce leader wobble and uneven wear.

• Automotive connector molds: the extended guide length improves leader centering and smooth stroke consistency during high-cycle ejection.
• Large die-casting / large mold components: the lubrication-free sliding concept helps keep friction and wear controlled in environments where maintenance access is limited.
• Industrial housings and brackets: the SUJ2 bearing-steel guide reduces sliding resistance, supporting reliable part ejection without routine oiling.

Because it is designed for oil-free operation and specifies SUJ2 bearing steel, this variant is suited to applications that require predictable leader guidance, lower running friction, and reduced dependence on lubrication procedures.

The leader bushing is made from SUJ2 bearing steel, selected for high wear resistance in sliding contact typical of ejector leader systems. SUJ2 is an equivalent of commonly referenced AISI 52100–class high-carbon chromium bearing steel, providing a structure that supports hardened wear surfaces.

• Wear resistance: hardened bearing steel microstructure improves resistance to abrasion from repeated leader movement.
• Toughness trade-off: increasing hardness for wear performance can reduce impact toughness; proper design clearances and load handling are important to avoid chipping under misalignment.
• Typical heat treatment state: bearing steels like SUJ2 are commonly quenched and tempered to achieve a functional balance between hardness and toughness.

Compared with softer construction steels, hardened SUJ2 offers significantly better sliding wear performance; compared with higher-alloy tool steels, it targets efficient bearing-like wear behavior for long-life leader guidance.

To select the correct EGBNZ oil-free ejector leader bushing, match the inner diameter d to the ejector leader (or corresponding guide shaft) diameter, using the available range of d = 16 ~ 50 mm. Then choose the guide length based on the required stability and stroke conditions.

• Step 1 (diameter match): select the bushing with the specified d closest to the leader diameter to ensure proper sliding fit and alignment.
• Step 2 (length selection): pick ℓ (Dh6 section length) from the available options: 10, 15, 20, 25, 30 mm. Longer ℓ generally improves centering stability under repeated ejection cycles.
• Tolerance/fit consideration: the notation Dh6 indicates a precision section length designation; ensure your mold leader and housing geometry accounts for this accuracy level.

For best performance, pair the chosen d and ℓ to the cavity/core space and the expected misalignment tolerance of the ejector system. Dimensions offered here are fixed by the listed variants; selection is typically configuration-based rather than custom machining.