EX Series Heavy Duty Urethane Springs Pillar Hourglass

This pillar-hourglass urethane spring is used inside injection mold tooling and die handling systems where die return force must remain stable over repeated cycles. Its Shore A90 elastomer rating and max elongation up to 30% make it suitable for applications that experience frequent opening/closing and require consistent restoring behavior.

• Automotive and industrial forming molds: Helps maintain predictable die positioning by providing controlled deflection under heavy load, reducing return variability during high-cycle stamping or forming operations.
• Die-cushioning and heavy-duty clamp return in transfer/handling fixtures: The pillar hourglass geometry supports strong retention and reliable force transmission even when compressive deflection approaches the upper operating range.
• Large cavity insert return systems: The heavy-load variant is suited when the mold requires robust spring capacity and controlled travel to prevent uneven closure.

Use the provided outer diameter and length options to match the available spring pocket while maintaining the intended load-deflection response.

This product uses a urethane elastomer engineered for heavy-load mold spring applications. The compound is specified for Shore A90, which provides high resistance to permanent set while maintaining controlled elastic return under compression.

No steel-grade heat treatment is specified because the spring body is elastomeric rather than metallic. Manufacturing is therefore focused on urethane molding to form the pillar hourglass shape, followed by dimensional control to ensure repeatable performance within the specified load and elongation limits.

• Hardness: Shore A90 supports strong load carrying and stable deflection.
• Wear and cycling: Designed to handle dynamic cycling with max elongation up to 30%.
• Trade-off: Higher hardness improves retention and load capacity, but may reduce maximum allowable compliance compared with softer polyurethane formulations.

Select the urethane pillar spring by matching the required maximum load, outer diameter (D), and length (L) to your mold’s spring pocket and intended return travel.

• Load match: Choose the variant whose Maximum Load (N) meets or exceeds your expected die return force under operating conditions (available values: 61292, 41188, 21575, 14710).
• Space constraints: Confirm the spring pocket accepts the selected D and L (available D: 100, 80, 60, 50 mm; available L: 82, 103, 123, 62 mm).
• Deflection/elongation: Ensure the working compression does not exceed the specified max elongation of 30% to keep the force response stable.

Because tolerance ranges are not provided in the supplied data, verify fit via your OEM pocket drawing and confirm the mounted condition (clearance and seating) maintains the intended load path.