Compression Spring 26–30mm OD — Reliable Force for DIY Automation & Mechanical Builds
When a project demands consistent return force and dimensional precision, a mismatched spring can stall your build or cause premature failure. Whether you are a maker assembling a custom actuator, a hobbyist building a jig, or a small workshop maintaining production tooling, finding the exact wire diameter, outer diameter, and free length in one place saves time and reduces waste.
These compression springs feature a 1.5mm wire diameter and are available in outer diameters ranging from 26mm to 30mm (approximately 1.02 in to 1.18 in) and free lengths from 15mm to 100mm (approximately 0.59 in to 3.94 in). Each listing is sold in packs of 10 pieces, giving you spares for prototyping or batch assembly. The springs are manufactured from carbon steel wire with a natural finish suited to indoor mechanical applications.
Typical use cases include compression return mechanisms in DIY automation rigs, spring-loaded clamps and fixtures for woodworking or metalworking benches, and replacement springs in light machinery, valve assemblies, or electronic enclosure latches where a 26–30mm outer diameter is specified.
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Compatibility: Suitable for spring seats, bores, or housings designed for 26–30mm outer diameter. Verify your required free length, wire diameter (1.5mm), and load rating before ordering. Sold in packs of 10 pieces.
✅ Key Features of These Compression Springs
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1.5mm Wire Diameter — Consistent wire gauge across the entire range ensures predictable spring rate and reliable elastic return in repeated-cycle applications.
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26–30mm Outer Diameter Range — Five OD options (26, 27, 28, 29, 30mm) let you match the exact bore or seat dimension without custom fabrication.
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15–100mm Free Length Selection — Thirteen length options per OD give you fine-grained control over travel distance and compressed height for your specific mechanism.
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Open-Coil Compression Design — Standard open-end coil geometry provides uniform load distribution and straightforward drop-in installation into most spring seats.
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Pack of 10 Pieces — Each order ships as a set of 10 identical springs, ideal for prototyping iterations, batch builds, or keeping spares on hand for maintenance.
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Carbon Steel Construction — Wound from carbon steel wire for firm, consistent spring force in dry indoor environments including machinery, tooling, and electronic enclosures.
📐 Technical Specifications — Compression Springs
| Wire Diameter |
1.5mm (0.059 in) |
| Outer Diameter (OD) |
26mm / 27mm / 28mm / 29mm / 30mm — See variant options |
| Free Length |
15mm – 100mm (0.59 in – 3.94 in) — See variant options |
| Coil Type |
Open-end compression coil |
| Material |
Carbon steel wire |
| Surface Finish |
Natural (uncoated) |
| Spring Rate |
See variant options |
| Quantity per Pack |
10 pieces |
| Application |
Indoor mechanical, tooling, automation, light machinery |
❓ Frequently Asked Questions
How do I choose the right outer diameter for my application?
Measure the bore or spring seat your spring will sit inside. The outer diameter of the spring should be slightly smaller than the bore so it can compress freely without binding. For a 26mm bore, select the 26mm OD variant and confirm the wire diameter (1.5mm) leaves adequate clearance. If the spring sits over a rod, the inner diameter (OD minus twice the wire diameter, approximately 23–27mm for this range) must be larger than the rod.
What free length should I select?
Free length is the uncompressed length of the spring. Choose a free length that is longer than your required working length by at least the travel distance you need. For example, if your mechanism needs 20mm of compression travel and the spring must remain under load at 30mm, select a free length of at least 50mm. Refer to your design's compressed height and travel requirements before ordering.
How strong are these springs — what load can they handle?
Spring rate and maximum load vary by OD and free length combination. Longer springs at the same OD and wire diameter will have a lower spring rate (softer feel), while shorter springs will be stiffer. Exact load data per variant is not listed; if your application requires a specific load rating, contact us to confirm before ordering.
Are these springs corrosion-resistant? Can I use them outdoors?
These springs are made from carbon steel with a natural (uncoated) finish. Carbon steel is not inherently corrosion-resistant and is best suited for dry indoor environments. For outdoor or high-humidity applications, consider stainless steel springs or apply a protective coating after installation. Exposure to moisture without protection will cause surface rust over time.
Are these compatible with standard spring seats and housings?
Yes — these are standard open-coil compression springs that fit any spring seat or housing designed for the corresponding outer diameter. Confirm that your housing accommodates a 26mm, 27mm, 28mm, 29mm, or 30mm OD spring and that the bore depth is sufficient for the free length you select. No special tooling is required for installation.
Can I use these springs in automated or motorized equipment?
Yes. These compression springs are well-suited for light-duty automation applications such as return mechanisms, spring-loaded actuators, and tensioning systems in DIY CNC rigs, conveyor guides, or pneumatic valve assemblies. Ensure the cycle rate and load do not exceed the spring's fatigue limit; for high-cycle industrial duty, contact us to discuss your requirements.
Why buy a pack of 10 instead of individual springs?
Packs of 10 give you spares for prototyping iterations without reordering delays. In batch builds or production runs, having identical replacement springs on hand reduces downtime. For hobbyists, extras allow you to test different compression ratios in your design before committing to a final configuration.
🛒 Select your wire diameter × outer diameter × length combination above, then add to cart.
