Inch Marshmellow Die Springs - Urethane Springs for Heavy Loads

Q: How do I select the correct spring based on maximum load and allowable travel?

Use the specified ranges for this urethane spring: maximum load 1.44–7.63 N and maximum elongation 0.34–2.75% . Calculate the expected working deflection from your ejection/press stroke and ensure it does not exceed the elongation limit. Confirm that the estimated force at the intended deflection stays under the maximum load range.

Q: Which outside diameter (OD) and length (L) should match my mold spring pocket and installed height?

Select OD in the 1–6 in range to fit the spring pocket while maintaining assembly clearance. Then choose L from 1.25 to 10 in so the installed height allows the required travel without bottoming out. Validate that the cavity/core movement does not force elongation beyond 0.34–2.75% .

Q: What inner diameter (d) sizes are compatible with different locating stud designs?

This series lists d options of 5/16, 5/8, 3/4, and 1 in . Match the selected d to the locating hardware in your tool (or to the hole/counterbore feature) to ensure stable alignment during cycling. Also confirm whether your application needs locating stud: without or with .

Q: Does the hole/counterbore design reduce wear in high-shock molding cycles?

Yes. The pillar-style configuration includes a hole/counterbore that supports more even load distribution across the spring seat. In tooling where shock and vibration are present, this helps reduce localized stress that can lead to accelerated wear and downtime.

Inch Marshmellow die springs are Lamina urethane springs engineered for heavy-load press and die applications. The pillar shape with hole/counterbore support distributes load evenly to absorb shock and vibration while maintaining stable performance.

Pillar-style urethane spring form with hole/counterbore for reliable weight distribution
Designed for heavy-duty operation using shore A90 urethane to resist high stress
Built to manage shock and vibration, helping protect sensitive systems and reduce downtime
Inch die spring format for robust support in tooling environments requiring consistent cycling

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Specifications

92 configurations available

Maximum Load (N)	Maximum Elongation (%)	Length (L) (in)	Outside diameter (in)	d (Inner diameter) (in)	Locating Stud
1.44	0.34	1.25	1-1/8	5/16	without
1.44	0.34	1.25	1-1/8	5/16	with
1.44	0.41	1.5	1-1/8	5/16	without
1.44	0.41	1.5	1-1/8	5/16	with
1.44	0.55	2	1-1/8	5/16	without
1.44	0.55	2	1-1/8	5/16	with
2	0.41	1.5	1-5/8	5/8	without
2	0.41	1.5	1-5/8	5/8	with
2	0.55	2	1-5/8	5/8	without
2	0.55	2	1-5/8	5/8	with
2	0.69	2.5	1-5/8	5/8	without
2	0.69	2.5	1-5/8	5/8	with
2	0.69	2.5	1-5/8	5/8	without
2	0.69	2.5	1-5/8	5/8	with
2.56	0.55	2	2	3/4	without
2.56	0.55	2	2	3/4	with
2.56	0.69	2.5	2	3/4	without
2.56	0.69	2.5	2	3/4	with
2.56	0.89	3.25	2	3/4	without
2.56	0.89	3.25	2	3/4	with
2.56	1.1	4	2	3/4	without
2.56	1.1	4	2	3/4	with
3.2	0.69	2.5	2.5	3/4	without
3.2	0.69	2.5	2.5	3/4	with
3.2	0.89	3.25	2.5	3/4	without
3.2	0.89	3.25	2.5	3/4	with
3.2	1.1	4	2.5	3/4	without
3.2	1.1	4	2.5	3/4	with
3.2	1.38	5	2.5	3/4	without
3.2	1.38	5	2.5	3/4	with
4.16	0.89	3.25	3-1/4	1	without
4.16	0.89	3.25	3-1/4	1	with
4.16	0.96	3.5	3-1/4	1	without
4.16	0.96	3.5	3-1/4	1	with
4.16	1.1	4	3-1/4	1	without
4.16	1.1	4	3-1/4	1	with
4.16	1.24	4.5	3-1/4	1	without
4.16	1.24	4.5	3-1/4	1	with
4.16	1.38	5	3-1/4	1	without
4.16	1.38	5	3-1/4	1	with
4.16	1.51	5.5	3-1/4	1	without
4.16	1.51	5.5	3-1/4	1	with
4.16	1.65	6	3-1/4	1	without
4.16	1.65	6	3-1/4	1	with
5.12	1.1	4	4	1	without
5.12	1.1	4	4	1	with
5.12	1.24	4.5	4	1	without
5.12	1.24	4.5	4	1	with
5.12	1.38	5	4	1	without
5.12	1.38	5	4	1	with

Product Guide

🏭Application Scenarios+

This pillar-style urethane die spring is used in injection mold tooling where the press/die requires controlled energy absorption under frequent cycling. The hole/counterbore support helps distribute spring load more uniformly, reducing localized stress that can accelerate wear around the spring seat.

Automotive connector and terminal molds: Use the spring to manage shock and vibration during ejection and closing, helping stabilize cavity-side components over long production runs.
Industrial housing and appliance molds: The heavy-load configuration supports consistent vertical deflection, improving repeatability when thick parts and higher clamping forces create dynamic impacts.
Precision inserts and press-fit die stations: Select for steadier cycling because the urethane spring’s governed elongation range limits overtravel while still absorbing transient loads.

Built with Shore A90 urethane, this variant is suited for heavy loads where toughness and damping are needed rather than rigid metal support.

🔧Material & Process Details+

The spring is manufactured from shore A90 urethane, selected to provide high resilience and damping for heavy-load press and die applications. Urethane formulations of this durometer typically balance wear resistance and controlled elasticity, trading off metal-like stiffness for better shock/vibration absorption.

Material behavior: High durometer urethane (A90) supports higher compressive stresses while maintaining elastic recovery through repeated cycles.
Heat treatment: Urethane springs are generally produced by molding and curing rather than steel heat treatment (e.g., no quench & temper or nitriding in the specification).
Wear/impact trade-off: Urethane offers strong damping for transient loads, but it may deform more than steel components under very high sustained forces.

If you require faster rebound and higher stiffness, metal spring grades may be considered; for vibration-rich, shock-damped tooling, A90 urethane is designed to excel.

📐Sizing & Selection Guide+

Choose dimensions to match the required deflection and fit within the mold’s spring mounting feature. Start with the length (L) range of 1.25 to 10 in to ensure the installed height supports the intended travel without bottoming.

Outside diameter: Select OD from 1 to 6 in to fit the spring pocket and maintain adequate clearance for assembly.
Inner diameter (d): Use one of the listed sizes—5/16, 5/8, 3/4, or 1 in—to match the locating hardware and ensure proper guidance.
Load/elongation matching: Verify the operating condition stays within the spring’s maximum load 1.44 to 7.63 N and maximum elongation 0.34% to 2.75%.
Locating stud option: Confirm whether you need without or with a locating stud to match your mold base design and counterbore.

Tolerance guidance is not provided in the specs; therefore, confirm clearance and seating dimensions with your mold drawings and the supplier’s tolerance documentation for the final fit.

Frequently Asked Questions

How do I select the correct spring based on maximum load and allowable travel?+

Use the specified ranges for this urethane spring: maximum load 1.44–7.63 N and maximum elongation 0.34–2.75%. Calculate the expected working deflection from your ejection/press stroke and ensure it does not exceed the elongation limit. Confirm that the estimated force at the intended deflection stays under the maximum load range.

Which outside diameter (OD) and length (L) should match my mold spring pocket and installed height?+

Select OD in the 1–6 in range to fit the spring pocket while maintaining assembly clearance. Then choose L from 1.25 to 10 in so the installed height allows the required travel without bottoming out. Validate that the cavity/core movement does not force elongation beyond 0.34–2.75%.

What inner diameter (d) sizes are compatible with different locating stud designs?+

This series lists d options of 5/16, 5/8, 3/4, and 1 in. Match the selected d to the locating hardware in your tool (or to the hole/counterbore feature) to ensure stable alignment during cycling. Also confirm whether your application needs locating stud: without or with.

Does the hole/counterbore design reduce wear in high-shock molding cycles?+

Yes. The pillar-style configuration includes a hole/counterbore that supports more even load distribution across the spring seat. In tooling where shock and vibration are present, this helps reduce localized stress that can lead to accelerated wear and downtime.

Is Shore A90 urethane appropriate for heavy-load die applications compared with metal springs?+

For heavy-load press and die environments with significant shock/vibration, this spring uses Shore A90 urethane to provide damping and controlled elasticity. Urethane is generally stiffer than softer durometers, supporting higher stress while absorbing transient impacts. If you need higher stiffness or metal-like dimensional stability under sustained loads, compare against steel spring options, but for vibration-rich tooling A90 urethane is specifically intended.