A return pin is a precision component in injection molding ejection systems that ensures proper retraction of ejector pins after part ejection.
| Parameter | Typical range | Notes & selection driver |
|---|---|---|
| Length | 50-300 mm | |
| Diameter | 3-25 mm | |
| Hardness | 52-58 HRC | |
| Tolerance | ±0.01 mm | |
| Straightness | 0.02 mm/100 mm | |
| Surface Finish | Ra 0.4 μm or better |
Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.
This component is used in the following industrial products
A mechanism within injection molds that pushes finished plastic parts out of the mold cavity after cooling and solidification.
A mechanical system within a die set that removes formed parts from the die cavity after the molding or stamping process.
A practical evidence checklist for RFQ preparation and supplier evaluation.
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Improper retraction can cause mold damage during closing, resulting in crushed pins, damaged mold surfaces, or defective parts with flash or marks. This leads to production downtime and costly repairs.
Visual inspection should occur daily, with dimensional checks every 1-3 months depending on production volume. High-wear applications may require monthly measurement of diameter and straightness.
Only if they match exact specifications (diameter, length, shoulder design). Even slight differences can cause misalignment, binding, or inadequate retraction.
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