Ejector Leader Pins & Bushings
Dedicated guidance systems that keep the ejector plate aligned during travel — preventing tilting, binding, and uneven ejection force.
Ejector Leader Pins & Bushings Categories
Ejector Leader Pins
Precision guide pins for ejector plate travel. Available in inlay type (press-fit with tap) and striking type (with dowel hole) configurations.
View ProductsEjector Leader Bushings
Matched bore components for ejector leader pins. Bronze and steel options with H7 bore tolerance.
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Ball-Bearing Ejector Guide Sets
Complete pre-assembled guide sets with recirculating ball bearings. Maximum ejector plate alignment precision for micro-connector molds.
View ProductsStandard vs Ball-Bearing Ejector Guide Systems
The choice between standard ejector leader sets and ball-bearing guide sets depends on your ejector count and alignment precision requirements.
| Criteria | Standard (Pin + Bushing) | Ball-Bearing Guide Set |
|---|---|---|
| Alignment Precision | ± 0.02 mm | ± 0.005 mm |
| Ejector Count | Up to 20 pins | 20+ pins or micro-pitch |
| Friction | Sliding (requires lubrication) | Rolling (minimal friction) |
| Maintenance | Grease every 10K-20K cycles | Grease-packed, 50K+ cycles |
| Cost | $ per set | $$$$ per set |
| Best For | General injection molds | Connector, optical, micro-part molds |
Ejector Leader Pin & Bushing Pairing
Every ejector leader pin series has a matched bushing. Using mismatched components causes accelerated wear and ejector plate wobble.
| Pin Series | Matched Bushing | Fit | Application |
|---|---|---|---|
| Inlay Type (EGH) | EGH Bushing | H7/g6 | Standard molds, press-fit mounting |
| Striking Type (EGHC) | EGHC Bushing | H7/g6 | Molds with dowel-hole positioning |
| Ball-Bearing Set | Integrated (pre-assembled) | Precision set | High-pin-count precision molds |
Pairing reference: For the complete matching guide, see How to Pair Ejector Leader Pins and Bushings — Matching Guide.
Why Ejector Plates Need Independent Guide Systems
The ejector plate assembly carries all ejector pins, sleeves, and blades. Without its own guide system, the plate relies on the clearance between ejector pins and their through-holes for alignment — but these holes are sized for ejection clearance (0.01–0.03 mm per side), not for guidance. As the plate travels forward, any angular error accumulates across the plate width, causing pins at the plate edges to contact their holes at an angle. This plate tilt causes galling, pin breakage, and uneven ejection marks on molded parts.
Ejector leader pins eliminate tilt by providing dedicated guidance with H7/g6 fit — the same precision used for mold-half alignment. The result: parallel ejector travel within 0.02 mm across the full stroke length.
Engineering note: For the full technical explanation, see Why Every Ejector Plate Needs Its Own Dedicated Guide System.
About Ejector Leader Pins & Bushings
Ejector leader pins and bushings provide independent guidance for the ejector plate assembly, ensuring parallel travel during the ejection stroke. Without dedicated ejector guidance, the plate relies on ejector pin clearance for alignment — a practice that causes tilting, galling, and premature pin breakage in high-pin-count molds. We supply inlay-type (press-fit), striking-type (dowel-positioned), and ball-bearing precision guide sets in SUJ2 and bronze materials.
Frequently Asked Questions
Why does an ejector plate need its own dedicated guide system?+
What is the difference between standard ejector leader pins and ball-bearing guide sets?+
How do I match ejector leader pins to ejector leader bushings?+
Do you offer ejector leader components in metric and imperial sizes?+
Engineering Resources
Why Every Ejector Plate Needs Its Own Dedicated Guide System
Engineering analysis of ejector plate tilt mechanics and how dedicated guide systems prevent pin breakage.
How to Pair Ejector Leader Pins and Bushings — Matching Guide
Series-by-series matching table for EGH, EGHC, and ball-bearing ejector guide components.
Need Custom Ejector Leader Pins & Bushings?
Precision ejector leader pins & bushings manufactured to JIS and DIN standards. MOQ 1 piece.