AN Series Low Repulsion Urethane Pillar Springs (Through Hole)

Where it fits in injection mold tooling: this through-hole urethane pillar spring is used in return mechanisms inside jigs, fixtures, and molded-part ejection/actuation systems where stable, repeatable compression and rebound are required.

• Automotive component molds: employ the spring to control return stroke in auxiliary tooling (e.g., slide support, small lifter/stop-return functions). The low-repulsion Shore A70 urethane helps achieve a controlled deflection response under repeated cycles, reducing rebound variability.
• Consumer electronics housings: integrate into fixtures that need consistent clamp/opening behavior to maintain part alignment. The through-hole pillar mounting provides reliable positioning through the tooling, supporting stable return even when loads fluctuate.
• Industrial die/fixture systems: use for controlled springback during compression and elongation, especially where the tooling must tolerate deflection; the design supports up to 25% max. elongation for service tolerance.

This variant uses low-repulsion urethane with a specified hardness of Shore A70. The low-repulsion characteristic is intended to moderate the rebound force (repulsion), promoting a more controlled return behavior under repeated compression.

• Material behavior: urethane in this hardness range balances flexibility and damping, supporting predictable compression/elongation in tooling.
• Wear resistance vs. toughness trade-off: higher hardness generally improves wear and dimensional stability, while maintaining sufficient toughness for cyclic return; exact wear and toughness values depend on load level and cycle rate.
• Heat treatment / forming state: the provided specification focuses on urethane hardness and performance behavior; no steel-grade heat treatment, quench/temper, or nitriding steps are stated for this product.

When comparing options, selecting a different urethane hardness level typically changes the force-deflection curve and rebound character; this Shore A70 selection is tuned for controlled response.

To select the correct pillar spring, match the required geometry to the mold/tool cavity or fixture interface, then verify the load capacity for your duty cycle.

• Choose the outer diameter (D): available sizes are 20, 25, 30, 40, 50, 60 mm. Select the D that fits your mounting recess/guide spacing without interfering with adjacent steel features.
• Choose the installed length (L): available lengths are 25 to 80 mm. L should be selected to achieve the needed working stroke while remaining within safe operating deflection.
• Validate maximum load: maximum load is offered in discrete ratings of 617, 912, 1245, 2549, 4028, 5962 N. Ensure your expected compressive load (including safety margin for peak conditions) stays at or below the selected maximum load.
• Deflection tolerance: this design supports up to 25% max. elongation, which helps tolerate tooling deflection during service.

Note on tolerances: no explicit dimensional tolerance values are provided in the data; confirm fit by checking your through-hole mounting clearance requirements against your tooling drawings and allowable backlash.