SKD61 Steel Nitrided Straight Ejector Sleeves

This nitrided straight ejector sleeve with an H7 inner bore tolerance is used in injection mold ejector systems where guided, repeatable movement is critical. In automotive connector and small housing molds, the sleeve helps stabilize ejector pins during high-cycle ejection, reducing the risk of binding caused by minor misalignment and debris.

For appliance and consumer electronics housings, the wear-resistant surface improves long-run performance under repeated start-stop motion and sliding contact between the ejector components.

The T4 head thickness (4 mm) makes this variant suitable for common ejector sleeve mounting layouts where a standardized interface thickness is expected. The ESNV-LC single-sleeve guidance geometry is particularly suited when you want consistent alignment using one integrated sleeve rather than multi-part guide arrangements.

The sleeve is manufactured from SKD61 steel, which is widely used for hot-work and mold applications and is commonly referenced as comparable to AISI H13 in performance range. The component is supplied in a nitrided condition, targeting improved surface hardness and wear resistance in the sliding region.

• Heat treatment / surface treatment: nitriding is applied to create a hard, wear-resistant surface layer while maintaining a tougher core for shock resistance.
• Hardness (typical nitrided guidance): nitriding generally raises surface hardness to a level that supports excellent abrasion and fretting resistance during ejection cycling.
• Trade-off: nitriding improves wear and scuff resistance, but dimensional control must consider nitride case growth and machining allowances to maintain the specified fit.

Compared with non-nitrided guide sleeves, the nitrided SKD61 variant is better suited for long production runs where surface wear and guide friction directly affect ejection stability.

Select dimensions by matching the ejector system shaft and hole sizes to the sleeve’s provided ranges: D/P (shaft diameter) = 4 ~ 10 mm, V (hole diameter) = 1.5 ~ 6 mm, and L (length) = 50 ~ 200 mm, 50 ~ 250 mm, or 80 ~ 300 mm depending on the specific configuration.

• Match the sliding fit: choose the sleeve size where D/P corresponds to the ejector pin/shaft you will guide, and rely on the H7 inner bore tolerance for precise alignment during assembly.
• Verify packaging into the tool: select L so the guided travel and engagement length meet your ejection stroke and sleeve coverage requirements without bottoming.
• Confirm interface geometry: use V to ensure compatible hole/feature sizing in your holder or mounting layout.

Because H7 tolerances govern fit, ensure your mating shaft dimensions and tool steel shrink/finish processes are consistent to avoid excessive clearance or binding. Head thickness is T4 = 4 mm, which is fixed for this variant.