Metric Formathane Urethane Pillar Springs

Metric Formathane urethane pillar springs are used inside injection mold tooling to control shock, vibration, and return force across guided components. Their pillar geometry helps maintain a stable stroke under load, which is especially useful in systems where misalignment or impact events can disturb cycling.

• Automotive connector and small housing molds: Use the very-high-load urethane grade (PO-652 Tan) and the matching spring length/OD to absorb handling impacts between clamp cycles, helping protect ejector or lifter linkages.
• Electronics and appliance module molds: Medium- or high-load options (PO-650 Red, CU-290 Yellow) help minimize vibration when actuating small moving cores, maintaining consistent motion through repeated duty cycles.
• Industrial fixtures with tight stack-up: Select the variant with or without a locating stud to integrate quickly into your mold base and preserve repeatable positioning.

Choose the urethane type according to required load level and select length (25–500 mm) and outside diameter (15–100 mm) to fit your spring pocket geometry.

This product uses Formathane urethane elastomer pillar springs cast to provide controlled deflection and damping. Instead of a metal heat-treatment cycle, the performance is determined by the urethane formulation and its elastomer microstructure.

• Urethane grades (by type): PO-652 Tan (very high load), PO-650 Red (medium load), CU-290 Yellow (high load), PO-670 Black (very low load). Higher-load grades generally offer greater stiffness and reduced rebound under impact, while very-low-load grades emphasize compliance.
• Manufacturing process: The springs are precision-cast for stable pillar geometry and consistent stroke response.
• Wear/toughness trade-offs: Increased stiffness (very high/high load) typically improves resistance to deformation under heavy cycles, while maintaining elastomer toughness to limit vibration transmission.

Because these are elastomer springs, hardness is governed by the selected urethane grade rather than steel HRC, and service life is driven by load selection and fit against the mold’s stack-up.

Correct sizing is essential to achieve the intended deflection and vibration damping in mold tooling. Start by matching the spring’s outside diameter (15–100 mm) to your spring pocket or guide bore, then set the length L (25–500 mm) to your available stack height.

• OD selection: Choose the outside dia. within 15–100 mm so the spring seats without rubbing or excessive clearance in the cavity/core area.
• Length (L): Use 25–500 mm to ensure full compression travel occurs within your mold’s operational stroke without bottoming.
• Inner diameter (d): Confirm compatibility with your guide/load shaft using the available d options: 11, 14, 22, 7, 8.5 mm.
• Locating stud: Select with or without a locating stud based on whether you need fixed positioning for repeatability in your stack-up.

For elastomer components, verify that the OD and stud/guide interface maintain stable alignment throughout compression; if your fixture imposes tight constraints, prefer the stud-equipped variant to improve positional repeatability.