Ejection Pins & Sleeves

Overview

Ejector pins and sleeves are vital components in injection molding and die-casting. Ejector pins are solid rods that push parts out of the mold once they're cooled and solidified. Ejector sleeves are hollow guides that house the pins, ensuring precise movement, reducing wear, and improving ejection reliability and part quality.

Ejection Pins & Sleeves

Key Features

High-Quality Construction & Materials
Ejector pins are typically made from tool steel through-hardened to ~60 HRC or hot-work steel—with nitriding providing ~950 HV—and are selected based on the application’s temperature and wear demands. Sleeves are similarly constructed for alignment and durability.
Wide Design Variety
Available in various styles including cylindrical, countersunk, flat (blade), and stepped pins to suit diverse part geometries. Sleeves may be standard or stepped to match pin types and mold configurations.
Surface Treatments & Coatings
Advanced treatments like nitriding, black oxide, and DLC coatings significantly enhance pin wear resistance, reduce friction, and ensure smoother ejection cycles.
Enhanced Guidance & Alignment
Sleeves guide ejector pins during movement, minimizing deflection, preventing damage, and lowering friction between pin and mold steel—improving cycle consistency and reducing defects.
Custom Application-Based Usage
Sleeve usage depends on mold design and the part’s surface requirements. In cosmetic or delicate areas, sleeves help avoid visible pin marks—used selectively based on ejector placement and mold complexity.
Efficient Multi-Pin Ejection Strategy
Multiple pins are arranged to distribute ejection force evenly, avoiding part deformation. Pins should be placed thoughtfully in robust or blind areas to minimize visible ejector marks.