Heavy Duty Urethane Pillar Springs - A Series, Through Hole

Through-hole urethane pillar springs are used in injection mold tooling wherever the return action must remain stable under repeated press cycles and elevated loads. They are commonly specified for automotive connector and sensor housing molds, where lifters, stripper areas, or guide fixtures benefit from controlled compression and predictable deflection—especially when parting forces fluctuate during ejection.

• Large-area cushioning: The through-hole design enables straightforward placement and alignment in die blocks for consistent load distribution.
• Heavy-load fixture return: A Shore A90 urethane grade supports frequent cycling while limiting dimensional drift through controlled elasticity.
• High-deflection scenarios: With up to 25% maximum elongation during use, these springs help maintain reliable return in long-stroke compression regions.

For designs requiring industrially robust cushioning rather than metal spring rebound, this A-series variant is suited to predictable deflection and repeatable performance within the specified load and size ranges.

This heavy-duty pillar spring uses urethane with Shore A90 hardness, selected to balance resilience and durability for high cyclic loading in tooling. Urethane elastomers are manufactured to maintain consistent mechanical response across working ranges, providing stable compression set behavior for repeated mold movements.

• Hardness / mechanical trade-off: Shore A90 offers higher load capacity than softer urethane grades, at the expense of slightly reduced ultimate flexibility.
• Wear resistance vs. toughness: Increased hardness improves wear resistance under frequent contact and compression, while still retaining toughness through elastic deformation rather than brittle fracture.
• Heat treatment: As an elastomer, it is not hardened via steel-style quench & temper or nitriding; dimensional stability is achieved through polymer manufacturing and curing rather than metal heat treatment.

If you need different deflection behavior, consider alternate urethane hardness grades (not provided in this dataset) to tune return force and allowable elongation.

To select the correct heavy-duty urethane pillar spring, match the outer diameter (D), length (L), and resulting maximum load to your mold’s expected compression and safety margin. Available ranges for this A-series through-hole format are D = 15–100 mm and L = 25–120 mm.

• Step 1: Choose diameter (D) to fit the die space and to provide the contact area your fixture requires.
• Step 2: Choose length (L) so the spring remains within its working compression region and maintains stable return throughout the cycle.
• Step 3: Verify load using the provided Maximum Load (N) = 981–49,720 N range, selecting a value that covers your maximum expected force with appropriate reserve.
• Step 4: Check inner chamfer option: the dataset indicates Additional inner diameter (C1) chamfering can be Yes/No; use the option that best supports your insertion geometry.

Tolerance details are not specified in the provided parameters; therefore, confirm your mounting hole size and clearance requirements with your supplier drawings for the chosen D and through-hole arrangement.