Ejector pins are core mold components widely used in plastic injection molds. Their main function is to push molded plastic parts out of the mold cavity smoothly after injection and cooling. Different workpiece structures and ejection requirements require different ejector pin styles. Common materials include SKD61, SKH51, SKD11, with nitriding or full hardening treatment for high wear resistance, high hardness and long service life. Standard sizes follow DIN, JIS and ISO specifications; custom dimensions are also available.

Types of Ejector Pins

 

Straight Ejector Pin

Straight Ejector Pin

The most universal round ejector pin. It features a simple uniform cylindrical body and a fixed head. Cost-effective, easy to install and replace.

Applications: Flat surfaces and general ejection positions of plastic parts

Stepped / Shouldered Ejector Pin

Stepped / Shouldered Ejector Pin​​​​​​​

A small-diameter tip and a larger supporting shaft. The stepped structure greatly improves rigidity and avoids bending or breaking when the tip is thin and long.

Applications: Narrow deep ribs, small ejection points, limited mold space

Flat Ejector Blade

Flat Ejector Blade​​​​​​​

A flat rectangular cross-section. It fits narrow ribs, thin grooves and long strip glue positions where round pins cannot be arranged. Anti-rotation structure prevents rotation during repeated ejection.

Applications: Narrow ribs, thin grooves, long strip glue positions

Ejector Sleeve

Ejector Sleeve

A hollow tubular ejector part matched with a core pin. It is specially used for ejecting cylindrical bosses, hollow columns and through-hole features, providing uniform force around the circle to prevent product deformation and white mark.

Applications: Cylindrical bosses, hollow columns, through-hole features​​​​​​​​​​​​​​

Material & Treatment Options
Item Options
Material SKD61 / SKH51 / SKD11
Surface treatment Nitriding, full hardening; DLC coating optional for high-cycle molding
Standards DIN / JIS / ISO standard sizes; custom dimensions on request

We supply precision mold ejector pins in standard and custom sizes. Surface nitriding, DLC coating and other surface treatments are optional for high-cycle molding. If you need ejector pin drawing, tolerance confirmation or bulk quotation, please contact us.