Heavy Duty Load Compression Spring Die Springs O.D:8/10/12/14mm Length:20-90mm

Match the load class to the force your tooling requires at the working deflection. Yellow (Extra Light) suits light stripping or ejection tasks with minimal force. Blue (Light) and Red (Medium) cover general-purpose stamping and mold ejection. Green (Heavy) and Brown (Extra Heavy) are for high-force clamping, heavy blanking, or applications where a stiffer spring rate is needed to maintain consistent force over a short stroke. If you are replacing an existing spring, match the color code on the worn spring.

The outer diameter (OD) must fit inside your spring pocket bore with a small clearance — typically 0.5–1 mm per side. The free length should be chosen so that at maximum working deflection the spring does not reach solid height. A common rule is to keep working deflection within 30–40% of the free length for standard die springs, or up to the manufacturer's rated deflection for the specific load class.

Chromium-silicon steel provides better oxidation resistance than plain carbon steel, but these springs are not stainless and will rust if exposed to moisture or cutting fluids over time. For wet or corrosive environments, consider applying a light machine oil coating or using stainless die springs. Storing springs in a dry environment will preserve their surface condition.

Yes. These die springs are designed specifically for mold and stamping tooling applications. They conform to ISO 10243 / JIS B 5012 dimensional standards, making them compatible with standard spring pockets in injection molds (ejector pin return, stripper plate), progressive stamping dies (stripper springs, lifter springs), and similar tooling. Select the OD and free length that match your existing pocket dimensions.

Die springs are a specialized subset of compression springs engineered for high-cycle tooling environments. They use rectangular or square wire cross-sections (rather than round wire) to achieve a higher load capacity within a given OD and free length, and they are manufactured to tighter tolerances. The color-coded load classification system makes it easy to specify and replace them consistently across different tooling setups.

Fatigue life depends on the deflection ratio (working deflection ÷ free length). At 30% deflection, ISO 10243 die springs are typically rated for approximately 1,000,000 cycles or more. At higher deflection ratios (e.g., 40–50%), cycle life decreases. Shot peening on these springs helps extend fatigue life. For critical production tooling, monitor springs periodically and replace when free length has shortened by more than 3–5% from the original value.

You can order as few as 1 piece by selecting Qty = 1 in the variant options. This is ideal for prototyping, tooling repair, or testing a specific size before committing to a larger quantity. If you need multiple pieces of the same size, select the appropriate quantity variant or add multiple units to your cart.