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When your project demands a spring that fits where others won't, finding the right wire diameter and free length in a single listing can be a frustrating search. Engineers, hobbyists, and repair technicians working on compact electronics, precision instruments, or scale models need small compression springs with consistent coil geometry and reliable spring-back force — without ordering in bulk or waiting on custom fabrication.
These compression springs are wound from round steel wire with a diameter of 0.8 mm or 0.9 mm (approx. 0.031–0.035 in). Outer diameters span 5–16 mm (approx. 0.20–0.63 in) and free lengths range from 10–50 mm (approx. 0.39–1.97 in). Each listing option ships as a set of 10 pieces, letting you stock the exact size you need without excess inventory.
Typical use cases include replacement springs in mechanical pencils and retractable pens, return springs in miniature switches and push-button assemblies, tension-balancing springs in RC car suspension and drone gimbal mounts, and preload springs in optical lens housings or camera shutter mechanisms.
Available in 0.8 mm and 0.9 mm wire gauges for fine-pitch, low-force applications where standard springs are too stiff.
Outer diameters from 5–16 mm and free lengths from 10–50 mm give you granular control over spring rate and travel distance.
Uniform pitch and closed/ground-style ends (typical for this wire range) ensure stable seating and repeatable deflection behavior.
Each variant ships as 10 identical springs — enough for prototyping, repair stock, or small-batch production without over-ordering.
Wound from carbon steel wire with a natural finish; suitable for dry indoor environments and light-duty mechanical assemblies.
Sized for RC models, electronics repair, pen mechanisms, and precision instruments where off-the-shelf springs rarely match the spec sheet.
| Wire Diameter | 0.8 mm or 0.9 mm (see variant options) |
|---|---|
| Outer Diameter (OD) | 5–16 mm (see variant options) |
| Free Length | 10–50 mm (see variant options) |
| Material | Carbon steel wire |
| Surface Finish | Natural / uncoated |
| End Type | See variant options |
| Spring Rate | See variant options |
| Quantity per Set | 10 pieces |
| Coil Direction | Right-hand (standard) |
| Application | Light-duty compression, return, and preload functions |
Start with three measurements: the bore or pocket inner diameter (your spring's OD must be slightly smaller), the shaft diameter if the spring rides over a rod (your spring's inner diameter must be slightly larger than the shaft), and the required free length and compressed length. Match these to the Wire Dia × Outer Dia × Length variant in the dropdown above.
Spring rate depends on wire diameter, outer diameter, free length, and number of active coils — all of which vary across the size matrix. Because each variant has a different geometry, specific spring-rate values are not listed universally. If you need a confirmed rate for a critical application, contact us with your selected size and we can provide guidance.
These springs are made from uncoated carbon steel wire and are best suited for dry indoor environments. Prolonged exposure to moisture, salt air, or corrosive chemicals may cause surface rust. For outdoor or humid applications, consider stainless steel springs or apply a light protective coating after installation.
Springs in this wire diameter range (0.8–0.9 mm) are typically wound with closed (non-ground) ends, which provide a flat seating surface suitable for most light-duty applications. If your design requires ground ends for precise parallelism, please contact us to confirm before ordering.
Yes — as long as the outer diameter of the spring you select is smaller than the bore of your spring seat, and the inner diameter is larger than any guide shaft. Use the variant size notation (Wire Dia × OD × Length) to verify fit. Standard spring pockets in pen mechanisms, switches, and RC components typically accept springs in the 5–14 mm OD range covered by this listing.
Yes. Small compression springs in the 0.8–0.9 mm wire range are commonly used as contact springs, battery terminal springs, and tactile feedback elements in PCB-mounted assemblies. Ensure the spring's OD and free length match your PCB footprint and housing depth. These springs are not plated, so avoid use in applications requiring electrical conductivity without additional surface treatment.
Each variant is sold as a set of 10 identical springs. The quantity option shown in the selector confirms this. If you need larger quantities, contact us for bulk pricing options.
