Lighter Load Yellow Mould Die Spring Compression Springs 8-50mm OD 20-300mm Long

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Lighter Load Yellow Mould Die Spring Compression Springs 8-50mm OD 20-300mm Long

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By HomeDIYer®

Outer diameter: 8mm

Inner diameter: 4mm

Length: 20mm

Price:

$2.07 USD

Stock:

In stock (500 units), ready to be shipped

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Yellow Mould Die Compression Springs — Consistent Lighter Load for Tooling & Automation

Engineers and toolmakers working with stamping dies, injection moulds, and precision jigs know the frustration of springs that lose tension mid-run or deflect unevenly under repeated cycling. These yellow mould die compression springs are engineered for lighter load applications where controlled, repeatable force is non-negotiable — making them the go-to choice for prototype builders, maintenance technicians, and small-batch manufacturers.

Each spring is manufactured from high-carbon spring steel wire with a consistent yellow powder-coat finish for easy load identification. Outer diameters range from 8mm to 50mm (0.31" to 1.97"), inner diameters from 4mm to 25mm (0.16" to 0.98"), and lengths from 20mm to 300mm (0.79" to 11.81"). The yellow colour coding follows the ISO 10243 standard for lighter load class, allowing fast visual identification on the shop floor.

Typical use cases include stamping and blanking die assemblies requiring controlled stripping force, injection mould ejector pin return systems, and custom jig-and-fixture spring-return mechanisms. These springs are also widely used in lighter load yellow die spring replacement applications, mould maintenance kits, and DIY automation projects where standard coil springs lack the dimensional precision required.

🔧 Compatible with standard ISO 10243 mould die spring pockets. Verify pocket diameter and free length before ordering.

✅ Key Features of These Yellow Mould Die Compression Springs

🟡Yellow = Lighter Load Class

Colour-coded per ISO 10243 standard for instant load identification. Yellow designates the lightest load rating in the mould die spring family.

📐Wide Size Range

OD from 8mm to 50mm, ID from 4mm to 25mm, and lengths from 20mm to 300mm — covering the majority of standard die spring pocket sizes in a single product line.

⚙️Consistent Deflection Performance

Wound from uniform-diameter spring steel wire to deliver repeatable force curves across the full compression stroke, reducing variability in automated tooling cycles.

🛡️Powder-Coat Surface Finish

Yellow epoxy powder coat provides corrosion resistance in typical workshop environments and helps maintain coil-to-coil separation during compression.

🔄Drop-In Die Spring Replacement

Dimensioned to match standard mould die spring pockets. Suitable as a direct replacement for worn or fatigued lighter-load springs in existing tooling without pocket modification.

🏭Suitable for Tooling & DIY Automation

Used in stamping dies, ejector return systems, spring-loaded fixtures, and custom automation builds where a lighter, controlled return force is required.

📐 Technical Specifications — Yellow Mould Die Compression Springs

Spring Type	Mould Die Compression Spring (Lighter Load)
Load Class	Light (Yellow)
Colour / Finish	Yellow powder coat
Outer Diameter (OD)	8mm – 50mm (0.31" – 1.97")
Inner Diameter (ID)	4mm – 25mm (0.16" – 0.98")
Free Length	20mm – 300mm (0.79" – 11.81")
Material	High-carbon spring steel
Standard Reference	ISO 10243 (lighter load class)
End Type	Closed and ground ends
Max Deflection Rate	See variant options
Spring Rate (N/mm)	See variant options
Operating Temperature	See variant options
Quantity per Order	1 piece (single spring)

❓ Frequently Asked Questions

How do I choose the right OD and ID for my die spring pocket?

Measure the pocket bore diameter — your spring OD should be 0.5mm to 1mm smaller than the pocket bore for a sliding fit. The ID must clear the guide pin with at least 0.5mm clearance on each side. Select the free length to match your required pre-load and working stroke. Use the variant selector above to find your exact OD × ID × Length combination.

What does the yellow colour indicate on these springs?

Yellow is the ISO 10243 colour code for the lighter load class of mould die springs. It indicates the lowest spring rate in the standard four-class system (yellow = light, blue = medium, red = heavy, green = extra heavy). Choose yellow when you need a gentle return force with minimal resistance — typical for thin-material stripping or ejector pin return in shallow moulds.

Are these springs suitable for outdoor or high-humidity environments?

The yellow powder-coat finish provides moderate corrosion resistance suitable for typical indoor workshop and toolroom conditions. For prolonged outdoor exposure or high-humidity environments, additional corrosion protection (such as periodic light oiling) is recommended. These springs are not rated for immersion or salt-spray environments.

Can I use these as a direct replacement for worn die springs in existing tooling?

Yes — provided you match the OD, ID, and free length exactly to the original spring specification. These springs follow standard ISO 10243 dimensional conventions, so they are dimensionally compatible with most standard mould die spring pockets. Always verify the load class (yellow = lighter load) matches your original tooling requirement before replacing.

What is the maximum recommended deflection for lighter load yellow die springs?

As a general guideline for ISO 10243 lighter load springs, maximum recommended deflection is typically 40–50% of the free length for extended service life, and up to 60% for shorter-cycle applications. Exceeding the maximum deflection rating will accelerate fatigue and reduce service life. Refer to the specific spring rate data for your selected variant for precise deflection limits.

How do I determine if I need a lighter load (yellow) vs. a heavier load spring?

Select the load class based on the force required at your working deflection. Yellow (lighter load) springs are appropriate when you need a low stripping or return force — typically for thin sheet metal, soft materials, or applications where excessive spring force would damage the workpiece or tooling. If your application requires more force at the same deflection, step up to blue (medium) or red (heavy) class springs.

Do these springs come in sets or individually?

Each order is for one (1) individual spring in the selected OD × ID × Length variant. If you need multiple springs for a die set or fixture, simply increase the quantity in your cart. Ordering in multiples ensures all springs in your set come from the same production batch for consistent spring rate matching.

🛒 Select your Outer Diameter × Inner Diameter × Length above, then add to cart.