Compression Spring 15mm Length — Precision Small Pressure Springs for Makers & Engineers
When a project demands reliable spring force in a compact footprint, finding the right compression spring can be frustrating. Loose tolerances, wrong wire diameters, or mismatched outer diameters waste time and compromise your build. These 15mm compression springs are engineered for makers, hobbyists, electronics assemblers, and mechanical engineers who need consistent, repeatable spring performance in small-scale applications.
Each spring is wound from round wire with a free length of 15mm (approximately 0.59 in). Wire diameters span 0.2mm to 1.4mm (approx. 0.008–0.055 in), and outer diameters range from 1.5mm to 25mm (approx. 0.06–0.98 in). Available materials include stainless steel (corrosion-resistant, suitable for damp or outdoor environments), spring steel (higher carbon content for stronger elastic return), and zinc-plated carbon steel (economical option with basic corrosion protection).
Typical use cases include button and switch return mechanisms in consumer electronics, valve and plunger assemblies in pneumatic or hydraulic tooling, pen and stylus clip springs, small jig and fixture clamping, and precision instrument calibration. Whether you are prototyping a custom actuator, restoring a vintage mechanism, or stocking a workshop assortment, these small compression springs for DIY projects deliver the dimensional accuracy you need.
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Compatibility: Suitable for standard spring seats, bores, and plunger housings sized to match the selected outer diameter. Verify inner bore clearance and seat recess depth against your chosen variant before ordering.
✅ Key Features of These Compression Springs
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Wide Wire Diameter Range — Choose from 0.2mm to 1.4mm wire diameter to match your required spring rate and load capacity, from ultra-light touch to firm mechanical resistance.
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Consistent 15mm Free Length — All springs share a 15mm (≈0.59 in) free length, making it straightforward to compare and swap variants within the same assembly envelope.
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Three Material Options — Stainless steel resists corrosion in humid or wet environments; spring steel delivers a stronger elastic return for higher-load applications; zinc-plated carbon steel offers an economical choice for dry indoor use.
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Broad Outer Diameter Selection — Outer diameters from 1.5mm to 25mm (approx. 0.06–0.98 in) cover a wide range of bore and seat sizes, reducing the need for custom tooling.
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Flexible Pack Quantities — Available in 5-piece and 10-piece packs so you can order exactly what your project requires without excess inventory.
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Precision-Wound Coils — Uniform coil pitch and closed ends provide stable seating and predictable deflection behaviour, critical for repeatable performance in instrumentation and automation.
📐 Technical Specifications — Compression Springs
| Spring Type |
Compression (coil) |
| Free Length |
15 mm (≈ 0.59 in) |
| Wire Diameter |
0.2 mm – 1.4 mm (see variant options) |
| Outer Diameter |
1.5 mm – 25 mm (see variant options) |
| Material |
Stainless steel / Spring steel / Zinc-plated carbon steel (see variant options) |
| End Type |
Closed ends |
| Spring Rate |
See variant options |
| Load Capacity |
See variant options |
| Surface Finish |
Natural (stainless & spring steel) / Zinc-plated (carbon steel) |
| Pack Quantity |
5 pcs or 10 pcs (see variant options) |
| Application |
Electronics, instrumentation, pneumatics, DIY mechanisms |
❓ Frequently Asked Questions
How do I choose the right wire diameter for my application?
Wire diameter directly affects spring rate and load capacity. Thinner wire (0.2–0.4mm) produces a softer spring suitable for light-touch buttons, pen clips, and delicate mechanisms. Thicker wire (0.8–1.4mm) generates higher spring force for valve plungers, clamping fixtures, and heavier actuators. As a starting point, match the wire diameter to the force range your application requires, then verify the outer diameter fits your bore or seat.
What is the difference between stainless steel and spring steel for compression springs?
Stainless steel (typically 304 or equivalent) offers excellent corrosion resistance, making it the preferred choice for outdoor, marine, food-contact, or humid environments. Spring steel (high-carbon steel) has a higher tensile strength and elastic modulus, which means it can store and release more energy per unit of deflection — ideal for applications demanding a firm, snappy return. Spring steel is more susceptible to rust if exposed to moisture without protection.
How do I measure the outer diameter I need?
Measure the inner diameter of the bore or housing that will contain the spring, then select a spring outer diameter (OD) that is 0.2–0.5mm smaller than the bore to allow free movement without binding. If the spring sits over a post or pin, measure the post diameter and select a spring inner diameter (ID = OD minus twice the wire diameter) that clears the post by at least 0.2mm.
Are these springs suitable for outdoor or corrosive environments?
The stainless steel variants are well-suited for outdoor, damp, or mildly corrosive environments. The spring steel variants are best used in dry indoor settings unless coated or protected. The zinc-plated carbon steel variants offer basic corrosion protection for dry indoor use and light-duty outdoor applications where prolonged moisture exposure is not expected.
Can I use these springs in electronics or PCB assemblies?
Yes. The smaller wire diameter variants (0.2–0.5mm) with correspondingly small outer diameters (1.5–6mm) are commonly used in battery contacts, tactile switch returns, stylus mechanisms, and SMT test probes. Stainless steel is preferred in electronics to avoid rust contamination. Confirm the spring dimensions against your PCB footprint or housing cavity before ordering.
How do I decide between a 5-piece and 10-piece pack?
The 5-piece pack is ideal for prototyping, single-unit repairs, or low-volume production where you need just enough springs to test fit and function. The 10-piece pack offers better value per spring for small-batch production runs, workshop stock, or applications where spares are useful. Both packs contain identical springs — only the quantity differs.
What does the zinc-plated (Zincification) option mean?
Zinc-plated springs are made from carbon steel wire that has been electroplated with a thin layer of zinc. This coating provides a barrier against light surface oxidation and gives the spring a bright, uniform appearance. It is a cost-effective option for dry indoor environments. The zinc layer is not as durable as stainless steel in wet or chemically aggressive conditions.
🛒 Select your wire diameter, outer diameter, and material above, then add to cart.
