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Engineers and toolmakers working with stamping dies, injection molds, and precision fixtures know the frustration of misidentifying spring load ratings mid-project. These 14mm rectangular die springs solve that problem with a standardized color-coding system — Yellow (light duty), Blue (medium duty), Red (heavy duty), and Green (extra-heavy duty) — so you can identify the correct spring at a glance without measuring deflection curves on the bench.
Each spring features a rectangular cross-section wire wound to an outer diameter (OD) of 14mm (~0.55 in), with available lengths ranging from 20mm to 90mm (~0.79 in to 3.54 in). The springs are manufactured from high-fatigue-resistance alloy steel wire, providing consistent load characteristics across repeated compression cycles. Packing options of 1, 3, 5, or 10 pieces allow you to order exactly what your application requires.
Typical use cases include die spring replacement in metal stamping presses, return-force elements in CNC router fixtures, compression buffers in automated assembly jigs, and load-bearing components in robotic end-effectors where consistent spring force is critical to cycle repeatability.
| Outer Diameter (OD) | 14 mm (~0.55 in) |
|---|---|
| Wire Cross-Section | Rectangular |
| Available Free Lengths | 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90 mm |
| Color / Load Rating | Yellow (Light) / Blue (Medium) / Red (Heavy) / Green (Extra-Heavy) |
| Material | Alloy steel (high-fatigue resistance) |
| Packing Quantity Options | 1 Pcs / 3 Pcs / 5 Pcs / 10 Pcs |
| Standard Reference | ISO 10243 die spring series (14mm OD class) |
| Surface Finish | See variant options |
| Max Deflection Rate | See variant options |
| Spring Rate | See variant options |
The four colors correspond to increasing load capacities: Yellow is light duty (lowest force), Blue is medium duty, Red is heavy duty, and Green is extra-heavy duty (highest force). Match the color to your required spring force and deflection. If you are replacing an existing die spring, match the color of the original spring. If designing from scratch, calculate the required load at working deflection and select the color whose load curve covers that value at your chosen free length.
"OD x Length" refers to the outer diameter (14mm) and the free (uncompressed) length of the spring. To select the correct length, measure the depth of your die pocket or the available travel in your fixture. The free length should be equal to or slightly longer than the pocket depth so the spring is pre-loaded at assembly. Ensure the pocket bore is sized to accept a 14mm OD spring with appropriate clearance (typically 0.5–1mm radial clearance).
Yes, these 14mm OD rectangular die springs are designed to the ISO 10243 die spring classification system, which defines OD, wire cross-section, and color-coded load ratings. They are intended as drop-in replacements for ISO 10243-compliant springs of the same OD and free length. Always verify the load rating (color) and free length match your original specification before installation.
Load capacity varies by color and free length. As a general guide, heavier colors (Red, Green) carry significantly higher loads than lighter colors (Yellow, Blue) at the same deflection percentage. Exact load-deflection curves depend on the specific free length selected. For precise load values, refer to the ISO 10243 load tables for 14mm OD springs, or contact us to confirm the spring rate for your chosen variant.
These springs are made from alloy steel, which provides good mechanical strength but has limited inherent corrosion resistance. For applications in humid, wet, or chemically exposed environments, we recommend applying a rust-inhibiting coating or lubricant, or storing springs in a dry environment when not in use. If your application requires stainless steel or coated springs, please contact us to confirm availability.
Yes. These rectangular die springs are well-suited for CNC fixture clamping, robotic end-effector return mechanisms, and automated assembly jigs where consistent, repeatable spring force is required. Select the color (load rating) and free length that match your required clamping force and stroke. For high-cycle automation applications, the alloy steel construction supports extended fatigue life under repeated compression.
Order 1 piece for prototyping or single-die applications. Order 3 or 5 pieces for small production dies that use multiple springs per tool. Order 10 pieces for production tooling, maintenance stock, or multi-cavity molds where several springs of the same specification are needed. Buying in larger quantities reduces the per-unit cost and ensures you have spares on hand for quick replacement during scheduled maintenance.
