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Finding a compression spring that fits your exact application without ordering custom parts is a constant frustration for makers, engineers, and repair technicians. These 15mm compression springs are engineered for precision-sensitive assemblies where consistent spring force and dimensional accuracy matter — from miniature electronics to mechanical fixtures and hobby robotics.
Each spring features a free length of 15mm and is available in outer diameters ranging from 1.5mm to 22mm (approximately 0.06 in to 0.87 in), with wire diameters spanning 0.2mm to 1.4mm (approximately 0.008 in to 0.055 in). Material options include stainless steel (10 pcs), spring steel (10 pcs), and zinc-plated carbon steel (5 pcs), covering a broad range of load and corrosion requirements.
Typical use cases include compression spring replacement in pen mechanisms and clicker assemblies, load-bearing return springs in small actuators and solenoid valves, and precision preload springs in optical mounts, sensor housings, and CNC fixture clamps.
Outer diameters from 1.5mm to 22mm and wire diameters from 0.2mm to 1.4mm cover the majority of small-to-medium precision spring applications in a single listing.
Choose stainless steel for corrosion resistance, spring steel for higher fatigue strength and cyclic load performance, or zinc-plated carbon steel for general-purpose use at a lower cost.
All variants share a uniform 15mm free length, simplifying drop-in replacement and multi-spring assemblies where consistent stack height is critical.
Springs feature closed ends for stable seating in spring pockets and flat-ground surfaces to ensure perpendicular load transfer and reduce lateral deflection under compression.
Stainless steel variants withstand moisture, mild chemicals, and outdoor exposure, making them suitable for marine accessories, outdoor fixtures, and food-adjacent equipment.
Stainless and spring steel variants ship in 10-piece packs; zinc-plated variants in 5-piece packs — ideal for prototyping, repair kits, and small-batch production runs.
| Free Length | 15 mm (0.59 in) |
|---|---|
| Outer Diameter (OD) | 1.5 mm – 22 mm (0.06 in – 0.87 in) — See variant options |
| Wire Diameter | 0.2 mm – 1.4 mm (0.008 in – 0.055 in) — See variant options |
| Material | Stainless Steel / Spring Steel / Zinc-Plated Carbon Steel — See variant options |
| End Type | Closed & Ground |
| Spring Type | Compression |
| Quantity per Pack | 10 pcs (Stainless & Spring Steel) / 5 pcs (Zinc-Plated) |
| Spring Rate | See variant options |
| Surface Finish | Natural (Stainless/Spring Steel) / Zinc Electroplated (Carbon Steel) |
| Operating Temperature | See variant options |
Measure the inner diameter of the spring pocket or bore where the spring will seat. The spring's outer diameter should be 0.1mm–0.5mm smaller than the bore to allow free movement without binding. For shaft-guided springs, the inner diameter of the spring should be 0.1mm–0.5mm larger than the shaft diameter. Use the variant selector to match your required OD from 1.5mm to 22mm.
Stainless steel springs offer excellent corrosion resistance and are suitable for humid, wet, or mildly corrosive environments. Spring steel (typically high-carbon or alloy steel) provides higher tensile strength and better fatigue life under repeated cycling, making it preferable for high-cycle mechanical applications. If corrosion resistance is not a concern and load capacity is the priority, spring steel is the stronger choice.
These springs are designed for small-to-medium precision applications. The load capacity varies by wire diameter and outer diameter — thicker wire diameters (e.g., 1.0mm–1.4mm) produce significantly higher spring rates than fine wire variants (e.g., 0.2mm–0.3mm). For exact spring rate and load data for your selected variant, please contact us to confirm before ordering for critical load-bearing assemblies.
Zinc-plated carbon steel springs offer moderate corrosion protection suitable for indoor or lightly exposed environments. For outdoor, marine, or consistently humid conditions, we recommend the stainless steel variants, which provide significantly better long-term corrosion resistance without surface coating degradation.
Yes, provided the free length (15mm), outer diameter, and wire diameter match your existing spring's specifications. Measure your original spring's free length, OD, and wire diameter before selecting a variant. If the spring rate of the original is known, contact us and we can help identify the closest matching variant from our range.
These springs are widely used in pen and clicker mechanisms, electronic switch assemblies, solenoid valve return springs, optical mount preloading, CNC fixture clamps, hobby robotics joints, small appliance components, and precision instrument housings. The broad size range makes them suitable for prototyping and repair across many industries.
The zinc-plated variants are available in 5-piece packs to offer a lower entry quantity for evaluation and prototyping purposes. Stainless steel and spring steel variants are sold in 10-piece packs. If you require larger quantities of any variant, please contact us for bulk pricing options.
