Injection Mold Design
Slider vs Lifter in Injection Mold Design
Compare sliders and lifters for releasing external and internal undercuts in injection mold design.
Short Answer
What engineers need to know
A slider generally moves laterally to release an external undercut. A lifter moves at an angle during ejection to release an internal feature. Selection depends on feature direction, travel, available steel, ejection sequence and production reliability.
Follow the undercut direction
Confirm movement and clearance
Protect shutoffs and wear areas
Review sequence and service access
When a slider fits
Sliders are often used for side holes, clips and external features that can be released with lateral movement before ejection.
When a lifter fits
Lifters can release internal hooks or recesses while participating in ejection, but they require angle, stroke and guidance review.
Reliability is more than geometry
Locking, return, wear, lubrication, replaceability and sensing can be as important as the initial mechanism choice.
Continue the Engineering Review
Related Topics & Project Evidence
Engineering FAQ
Questions about slider vs lifter
When should slider vs lifter be reviewed?
Review slider vs lifter before detailed mold design and steel cutting, while product geometry and tooling decisions can still be discussed efficiently.
Can one rule be applied to every slider vs lifter project?
No. Resin, part geometry, appearance, tolerance, production volume and molding conditions must be evaluated together for the specific project.