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When a stamping die, injection mold, or industrial fixture loses its consistent return force, downtime follows fast. Engineers, toolmakers, and serious DIY fabricators who need a compression die spring that holds its load rating cycle after cycle will find this ISO-standard series purpose-built for the task. Available in five load grades — from light-duty TF-Yellow through extra-heavy TB-Brown — these springs are engineered to match the exact force requirement of your application without guesswork.
Each spring in this series features an outer diameter of 22 mm (0.87 in) and an inner diameter of 11 mm (0.43 in), fitting standard 11 mm guide pins. Free lengths span from 20 mm (0.79 in) up to 300 mm (11.81 in), giving you precise stroke and deflection control across a wide range of tooling depths. Material options include alloy steel (heat-treated), SWOSC-V (oil-tempered silicon-chrome wire for fatigue resistance), and 65Mn spring steel (manganese steel for cost-effective high-load applications).
Typical use cases include progressive stamping dies requiring consistent stripping force, plastic injection mold ejector return systems, hydraulic press tooling with controlled pre-load, and custom jig-and-fixture assemblies where a compression die spring for mold tooling must maintain dimensional accuracy over extended production runs.
Outer diameter 22 mm, inner diameter 11 mm — drop-in compatible with ISO 10243 spring pockets and 11 mm guide pins across standard tooling platforms.
TF-Yellow (light), TL-Blue (medium-light), TM-Red (medium), TH-Green (heavy), TB-Brown (extra-heavy) — select the exact spring rate your application demands.
Alloy steel for general tooling, SWOSC-V oil-tempered silicon-chrome wire for extended fatigue life, and 65Mn manganese steel for high-load cost-sensitive applications.
Free lengths from 20 mm (0.79 in) to 300 mm (11.81 in) allow precise stroke and deflection matching for shallow punch pads to deep-draw tooling.
Tightly controlled wire diameter and coil pitch deliver repeatable spring force, reducing die maintenance intervals and keeping part tolerances stable across production runs.
Springs are finished to resist oxidation in typical workshop and toolroom environments; SWOSC-V material provides additional resistance to stress-corrosion cracking under cyclic load.
| Outer Diameter (OD) | 22 mm (0.87 in) |
|---|---|
| Inner Diameter (ID) | 11 mm (0.43 in) |
| Free Length Range | 20 mm – 300 mm (0.79 in – 11.81 in) |
| Load Grades Available | TF-Yellow / TL-Blue / TM-Red / TH-Green / TB-Brown |
| Material Options | Alloy Steel / SWOSC-V / 65Mn |
| Standard | ISO 10243 |
| End Type | Closed & ground ends |
| Deflection Rate | See variant options |
| Max. Deflection (%) | See variant options |
| Surface Treatment | See variant options |
| Operating Temperature | See variant options |
Select the load grade based on the stripping or ejection force your tooling requires. TF-Yellow is the lightest and suits low-force stripping applications; TL-Blue and TM-Red cover medium-load presses; TH-Green and TB-Brown handle heavy and extra-heavy loads respectively. If you have a force calculation from your die design, match it to the spring rate listed in the variant specifications. When in doubt, choose one grade heavier than calculated to allow for wear over the spring's service life.
Alloy steel (heat-treated) is the standard choice for general-purpose die and mold tooling — it offers a good balance of strength and cost. SWOSC-V (oil-tempered silicon-chrome wire) is engineered for high-cycle fatigue applications where the spring is compressed and released millions of times; it resists stress-corrosion cracking better than plain alloy steel. 65Mn (manganese spring steel) provides high hardness and load capacity at a lower material cost, making it suitable for heavy-load applications where cycle count is moderate.
The free length should be chosen so that the spring operates within its recommended deflection range — typically 20–30% of free length for long service life, and no more than the maximum rated deflection (usually 30–45% depending on load grade). Measure the available spring pocket depth and the required working stroke, then select a free length that keeps the spring within its safe operating deflection at both pre-load and full compression. Longer springs allow more total stroke but require deeper pockets.
Yes. These springs conform to ISO 10243 dimensional standards with an OD of 22 mm and ID of 11 mm, making them direct replacements for ISO-standard spring pockets and compatible with 11 mm guide pins used in most European and internationally standardized die sets. They are also dimensionally equivalent to common JIS B 5012 and similar national standards that follow the same OD/ID series.
Service life depends on the material grade, operating deflection, and cycle rate. SWOSC-V springs are rated for the highest cycle counts and are recommended for high-volume production tooling. Alloy steel springs provide reliable service in moderate-cycle applications. Operating springs at or below 25% of free length deflection significantly extends service life. Avoid exceeding the maximum rated deflection, as this causes permanent set and rapid fatigue failure. Regular inspection for coil cracking or measurable free-length loss is recommended.
These springs are finished to resist light oxidation in typical toolroom conditions. For environments with coolant exposure, high humidity, or chemical contact, SWOSC-V material offers better resistance to stress-corrosion cracking compared to plain alloy steel. For aggressive chemical environments, consider applying a compatible rust-inhibiting oil or grease to the spring surface. If your application involves prolonged immersion or strong acids/alkalis, contact us to confirm suitability before ordering.
When replacing a die spring, verify the OD (22 mm), ID (11 mm), and free length of the original spring. Also confirm the load grade by checking the color code on the worn spring. If the original spring shows permanent set (free length shorter than nominal), consider upgrading one load grade or switching to SWOSC-V material for longer life. Inspect the spring pocket and guide pin for wear or damage before installing the replacement, as a worn pocket can cause premature spring failure.
