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Engineers and makers who rely on precise spring return force know the frustration of sourcing springs that lose tension after a few cycles or arrive with no way to distinguish rates at a glance. These spiral stamping compression mould springs are designed for professionals and serious hobbyists who need repeatable, measurable performance across injection mould tooling, die sets, and mechanical assemblies.
Each spring is cold-coiled from alloy steel wire and finished with a color-coded lacquer coating — Yellow, Blue, Red, Green, or Brown — allowing instant load-rating identification on the bench or in the tool. The 30×15mm series (outer diameter × inner diameter) covers free lengths from 25 mm (≈0.98 in) to 300 mm (≈11.81 in); the 35×17.5mm series spans the same free-length range with a larger cross-section for higher load capacity.
Typical applications include injection mould stripper plates requiring consistent ejection force, progressive die sets needing controlled blank-holder pressure, and custom jig-and-fixture assemblies where a compression mould spring for die tooling must fit a defined pocket diameter. The color-coded multicolor spiral stamping spring system also suits maintenance teams managing mixed spring inventories across multiple press lines.
Five distinct lacquer colors (Yellow, Blue, Red, Green, Brown) map to different load grades, enabling instant visual identification and reducing mis-installation risk in multi-spring tooling setups.
Cold-coiled alloy steel wire with uniform pitch delivers consistent spring rate across the full compression stroke, maintaining force linearity from 25 mm to 300 mm free lengths.
30×15mm (OD×ID) and 35×17.5mm (OD×ID) series cover a broad range of mould pocket sizes, letting you standardize on one supplier for both light-duty and medium-duty tooling applications.
Available from 25 mm (≈0.98 in) to 300 mm (≈11.81 in) in the same diameter series, reducing the need to stack or modify springs when tooling stroke requirements change.
The color lacquer coating provides a barrier against light surface oxidation during storage and handling, helping maintain dimensional integrity until the spring is installed in the mould.
Ground flat ends (typically) ensure stable seating against mould plates without rocking, distributing load evenly across the contact face for repeatable cycle-to-cycle performance.
| Spring Type | Spiral Stamping Compression Mould Spring |
|---|---|
| Series A — Outer Diameter | 30 mm (≈1.18 in) |
| Series A — Inner Diameter | 15 mm (≈0.59 in) |
| Series B — Outer Diameter | 35 mm (≈1.38 in) |
| Series B — Inner Diameter | 17.5 mm (≈0.69 in) |
| Free Length Range | 25 mm – 300 mm (≈0.98 in – 11.81 in) |
| Available Colors / Load Grades | Yellow, Blue, Red, Green, Brown |
| Material | Alloy steel (cold-coiled) |
| Surface Finish | Color lacquer coating |
| End Type | See variant options |
| Spring Rate | See variant options |
| Maximum Deflection | See variant options |
| Wire Diameter | See variant options |
| Quantity per Order | 1 piece (single unit) |
Match the outer diameter to your mould pocket bore and the inner diameter to your guide post or mandrel diameter. The 30×15mm series fits pockets bored to approximately Ø30 mm with a Ø15 mm guide post; the 35×17.5mm series fits larger Ø35 mm pockets with a Ø17.5 mm post. If your pocket falls between sizes, choose the series whose outer diameter is closest to — but does not exceed — the pocket bore.
The color-coding follows a standard mould spring load-grade convention: Yellow typically denotes a light load grade, Blue a medium load, Red a medium-heavy load, Green a heavy load, and Brown an extra-heavy load. Always verify the specific spring rate for your selected size and color in the variant details, as actual force values vary by free length.
Measure the available pocket depth in your mould or die set. The free length of the spring should be long enough so that, at maximum compression (solid height), the spring still exerts the required force. A common rule of thumb is to select a free length approximately 1.5–2× the required working stroke, then verify the resulting compressed load against your tooling specification.
The lacquer coating provides light protection against surface oxidation during storage and handling. For environments with continuous moisture exposure or coolant contact, consider applying a compatible rust-inhibiting oil after installation. These springs are intended for standard mould and die applications rather than fully submerged or chemically aggressive environments.
Yes. While designed to mould spring dimensional standards, these compression springs are also used in stamping dies, progressive dies, jig-and-fixture assemblies, and general mechanical return applications where a known outer and inner diameter must fit a specific pocket. Confirm the spring rate and deflection range match your load requirements before use outside standard mould tooling.
You need three confirmed values: (1) outer diameter — must fit inside your pocket bore with clearance; (2) inner diameter — must clear your guide post or mandrel; (3) free length — must provide adequate working stroke and force at your compressed height. Cross-reference these three values with the size option shown in the variant selector above. If you need load-rate data for a specific size and color, contact us to confirm before ordering.
Spiral stamping compression mould springs are manufactured to tighter dimensional tolerances than general-purpose coil springs, with controlled outer and inner diameters to fit standardized mould pockets. They typically feature ground or close-wound ends for stable seating and are rated to specific deflection percentages (e.g., 30%, 40%, 50% of free length) rather than open-ended load ranges, making them more predictable in precision tooling applications.
