Runner Lock Pins & Accessories
Runner lock pins in straight and tapered shaft configurations with 6 tip styles — standard, hard lock, super hard lock, edge, cone, and step — plus matching collars and bushings.
Products — 10 Variants
Straight Shaft, Standard Tip
Runner Lock Pins - Straight Shaft, Standard Tip
Straight Shaft, Hard Lock Tip
Runner Lock Pins - Straight Shaft, Hard Lock Tip
Tapered Shaft, Standard Tip
Runner Lock Pins - Tapered Shaft, Standard Tip
Tapered Shaft, Hard Lock Tip
Runner Lock Pins - Tapered Shaft, Hard Lock Tip
Straight Shaft, Edge Tip
Runner Lock Pins - Straight Shaft, Edge Tip
Straight Shaft, Standard with Step Tip
Runner Lock Pins - Straight Shaft, Standard with Step Tip
Straight Shaft, Super Hard Lock Tip
Runner Lock Pins - Straight Shaft, Super Hard Lock Tip
Straight Shaft, Cone-Shaped Tip
Runner Lock Pins - Straight Shaft, Cone-Shaped Tip
Runner Lock Pin Collars for Pin Head
Runner Lock Pin Collars for Pin Head
Runner Lock Pin Bushings: Straight, Taper, Reversed Taper Lead Options
Runner Lock Pin Bushings - Straight, Taper, Reversed Taper Lead Options
Compare Runner Lock Pin Variants
Runner lock pins differ by shaft type, tip style, and accessories. Use this matrix to narrow your selection:
| Feature | Straight Shaft | Tapered Shaft |
|---|---|---|
| Shaft Geometry | Uniform diameter along full length | Gradually increasing diameter toward head |
| Runner Retention | Standard — holds runner by tip undercut | Enhanced — taper creates progressive locking |
| Alignment | Standard bore clearance | Self-centering as mold closes |
| Tip Options | Standard, Hard Lock, Super Hard Lock, Edge, Cone, Step | Standard, Hard Lock |
| Best For | Most three-plate molds — widest tip selection | High-speed molds, precise runner alignment needed |
Tip Style Comparison
| Tip Style | Retention Force | Best For |
|---|---|---|
| Standard | Low–Medium | Commodity resins (PP, PE, ABS) with normal shrinkage |
| Hard Lock | High | Crystalline resins (PA, POM) with high shrinkage |
| Super Hard Lock | Very High | High-shrinkage resins or heavy runners |
| Edge | Medium | Thin runners where standard tip interferes with flow |
| Cone | Medium | Round cross-section runners |
| Step | Variable | Multi-level runner plates |
Selection rule: Shaft type affects alignment; tip style affects retention force. For detailed comparisons, see our Straight vs. Tapered shaft guide and Tip Style Comparison.
Step-by-Step Selection Guide
Follow these steps to select the right runner lock pin configuration:
Sizing rule: Pin diameter should be 40–60% of runner width. For collar and bushing pairing guidance, see our Collar & Bushing Pairing Guide.
Required Accessories
Runner lock pins require matching collars and bushings for proper installation:
| Runner Lock Pin | Collar (RLC type) | Bushing |
|---|---|---|
| Match collar inner diameter to pin head diameter | Collar seats in runner plate counterbore, retains pin head | Bushing guides pin shaft through mold plate |
→ Collars and bushings are included in this product category. Select by matching pin diameter.
Pairing note: For the complete size compatibility chart, see our Runner Lock Pin Collar & Bushing Pairing Guide.
About Runner Lock Pins
Runner lock pins are essential three-plate mold components that hold the solidified runner in the runner plate during the first opening (gate separation). Without proper runner locking, the runner falls or shifts, causing misalignment on the next shot. MISUMI offers the widest selection of tip styles in the industry — 6 tip types across straight and tapered shaft configurations.
Application Scenarios
Different production environments call for different locking solutions:
Standard Three-Plate Molds
Standard production with commodity resins (PP, PE, ABS). Runner doesn't shrink significantly.
Standard tip provides adequate retention. Straight shaft is simplest to install and the most cost-effective option.
High-Speed Automotive Molds
Fast-cycle molds running crystalline resins (PA66, POM) with significant runner shrinkage during cooling.
High-shrinkage resins grip the runner plate tightly during cooling. Hard lock or super hard lock tips provide the extra retention force needed to prevent runner pull-out.
Precision Alignment Molds
High-precision molds where runner plate alignment affects gate position accuracy across cavities.
Tapered shaft self-centers the runner plate as the mold closes, ensuring consistent runner-to-gate alignment shot after shot. Critical for tight-tolerance connector molds.
Frequently Asked Questions
What is the difference between standard tip and hard lock tip runner lock pins?+
Straight shaft vs tapered shaft runner lock pins — when to use each?+
What size collar and bushing do I need for my runner lock pin?+
How do I determine the correct runner lock pin diameter for my runner cross-section?+
Engineering Resources
Straight vs. Tapered Runner Lock Pins
Compare shaft types for retention, alignment, and application suitability.
Runner Lock Pin Tip Comparison: Standard, Hard Lock, Edge & Cone
Side-by-side comparison of all 6 tip styles.
How to Match Runner Lock Pins with Collars and Bushings
Size compatibility chart for pins, collars, and bushings.
Need a Custom Quote?
Specify your pin diameter, shaft type (straight/tapered), tip style, and runner cross-section. Include collar and bushing requirements for a complete set quote.