Runner Change Pins
Runner flow direction change pins in Z-pin, ejector-pin, and fixed-side configurations for redirecting runner flow paths between mold plates.
Products — 3 Variants
Runner Flow Direction Change Pins: for Z Pins, Configurable Length
Runner Flow Direction Change Pins - for Z Pins, Configurable Length
Runner Flow Direction Change Pins: for Ejector Pins, Configurable Length
Runner Flow Direction Change Pins - for Ejector Pins, Configurable Length
Runner Flow Direction Change Pins for Fixed Side
Runner Flow Direction Change Pins for Fixed Side
Compare Runner Change Pin Types
Three configurations serve different mold plate arrangements:
| Feature | Z-Pin Type (RCPL) | Ejector-Pin Type | Fixed-Side Type (RCPK) |
|---|---|---|---|
| Installation Location | Z-pin bore in runner plate | Ejector pin bore in ejector plate | Fixed (stationary) mold half |
| Flow Direction Change | Runner plate to cavity plate | Ejector side to runner plate | Fixed side to runner plate |
| Length | Configurable | Configurable | Standard lengths |
| Best For | Most common — redirects flow at Z-pin locations | When Z-pin bores unavailable, using existing ejector bores | When flow change needed on the injection (fixed) side |
Selection rule: Choose based on which bore locations are available in your mold design. See our Runner Change Pins Comparison Guide.
How Runner Change Pins Redirect Flow
Flow Redirection Mechanism
In multi-cavity molds, the runner path from the sprue to each cavity may require direction changes between plates. Runner change pins install in cross-plate bores and create a flow channel that transfers resin from one plate level to another.
Why Direction Changes Are Needed
When the sprue is centered but cavities are arranged asymmetrically, or when the runner must pass through an intermediate plate, direction change pins bridge the gap. Without them, the runner layout would require complex machining in the plate surfaces.
Design tip: Minimize the number of direction changes to reduce flow resistance. See our Flow Redirection Guide for layout optimization.
About Runner Change Pins
Runner change pins are precision-ground steel pins with internal flow channels that redirect runner flow between mold plates. Available in Z-pin, ejector-pin, and fixed-side configurations to accommodate different mold plate arrangements. The Z-pin and ejector-pin types offer configurable lengths for exact plate-thickness matching.
Application Scenarios
Runner change pins solve specific mold layout challenges:
Asymmetric Multi-Cavity Layouts
Molds where cavities are not symmetrically arranged around the sprue, requiring runner paths that change direction between plates.
Z-pin type change pins redirect flow at existing Z-pin locations, avoiding complex runner channel machining in plate surfaces.
Family Molds with Different Cavity Depths
Family molds producing different parts at different depths in the mold. Runner must reach cavities at multiple plate levels.
Change pins bridge flow between plates at different levels, enabling runner access to cavities that cannot be reached from a single runner plane.
Engineering Resources
Need a Custom Quote?
Specify your change pin type (Z-pin/ejector/fixed), required length, and bore diameter. Configurable lengths for exact plate-thickness matching.