Spreaders

Overview

In die casting systems, sprue spreaders (also referred to as runner or constant-area spreaders) are installed within the ejector die to channel molten metal from the sprue bushing, helping distribute it evenly toward the runners and cavities.

Shot Sleeves / Plunger Sleeves

Key Features

Modular Two-Part Design
Many sprue spreaders consist of a threaded body and a replaceable head (often made of wear-resistant materials like tungsten steel). This allows quick, cost-effective replacement of worn parts without removing the entire spreader.
Zinc Die Casting Compatibility
These components are specifically designed for zinc die casting—not suitable for aluminum, magnesium, brass, or lead—ensuring optimal function and longevity in compatible systems.
Cooling-Enhanced Designs
Some sprue and runner spreaders can be configured with baffle or cascade cooling options, improving metal flow control and solidification speed in zinc casting setups.
High-Durability Materials
Constructed with robust alloys such as H-13 tool steel (hardened to 44–46 HRC), these spreaders are built for high-wear resistance and long service life—even under extreme casting conditions.
Improved Flow Efficiency
Spreaders help optimize filling dynamics—reducing turbulence, promoting consistent molten metal delivery, and minimizing defects in finished parts.