AZNX Series Low Repulsion Urethane Springs Pillars, Counterbore

These low repulsion urethane spring pillars with counterbore holes are used inside injection mold tooling to stabilize relative movement between moving components, such as the interface between ejector systems and guided tooling sections. The counterbore geometry helps the pillar seat consistently in a tool cavity, supporting repeatable positioning under cycling loads.

They are well-suited for automotive and industrial connector molds, where long run times require predictable spring response to maintain alignment and return motion without introducing excessive rebound. The Shore A70 low repulsion urethane formulation supports controlled load behavior, making it easier to tune motion response in assembly fixtures.

• Small alignment fixtures and die stations: use the specified outer diameter (D = 25/30/40/50 mm) to match available pocket space.
• Counterbore retention designs: match the gimlet hole length (H = 5–80 or 5–100 mm) to the required engagement depth.
• Bolted assemblies: select the nominal bolt diameter (M = 6–8 or 10–12) for proper clamping compatibility.

The AZNX series uses a low repulsion urethane formulation with Shore A70, chosen to provide controlled movement and load response under repeated cycling. Urethane springs typically balance elastic resilience (good return behavior) with wear resistance appropriate for tooling interfaces that experience moderate mechanical stress.

Manufacturing is generally based on precision urethane molding to achieve the counterbore and hole geometry without the dimensional variability common to metal spring components. Unlike steels, this type of component does not rely on carburizing, quenching, or nitriding for performance; instead, the key properties come from the cured urethane microstructure and hardness selection.

• Hardness: Shore A70 (tuned for controlled movement rather than maximum stiffness).
• Trade-off: compared to harder elastomers, Shore A70 can offer better damping and return stability, while softer grades would typically allow larger deflection.

Start by matching the pillar outer diameter D to the mold pocket or guide feature that accepts the pillar: available sizes are D = 25, 30, 40, or 50 mm. Next, choose the overall length L based on your stack height and required free working travel: L = 20–60 mm or L = 25–100 mm, depending on the configuration range.

For counterbore retention, select the gimlet hole length H to ensure adequate engagement depth for the fastener region: H = 5–80 mm or H = 5–100 mm. Then verify the bolt compatibility by choosing the nominal bolt diameter M in the correct range (6–8 or 10–12).

• Fit/tolerance considerations: treat counterbore seating as a functional fit—confirm clearance and seating depth so the pillar sits squarely under clamping.
• Configurable dimensions: L, D, H, and M are variable within the stated ranges; keep H aligned with the actual hole depth in your tool design.