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Engineers, hobbyists, and repair technicians who work with compact mechanisms know the frustration of sourcing the exact spring size they need. Whether you are restoring a precision instrument, building a custom fixture, or prototyping a new device, an ill-fitting compression spring can stall an entire project. These small compression springs are stocked in an extensive size matrix so you can match wire diameter, outer diameter, and free length to your exact requirement without compromise.
Each pack contains 10 pieces of steel compression springs. Wire diameter ranges from 0.7 mm to 0.8 mm (approximately 0.028–0.031 in), outer diameter spans 4 mm to 12 mm (approximately 0.16–0.47 in), and free lengths are available from 5 mm up to 305 mm (approximately 0.20–12.0 in). The springs are wound from carbon steel wire and carry a natural steel finish.
Typical applications include small compression springs for electronics enclosures and battery contacts, miniature return springs in model mechanisms and RC components, and precision compression springs for jigs, fixtures, and laboratory instruments where consistent force and compact geometry are required.
Wire dia 0.7–0.8 mm, OD 4–12 mm, free length 5–305 mm — select the exact combination for your application.
Wound from carbon steel wire for reliable spring-back force and consistent coil geometry across the full length range.
Each order ships 10 identical springs, giving you spares for prototyping, testing, or replacement without over-ordering.
Closed (ground or plain) end coils provide a flat seating surface for stable load transfer in confined spaces.
Uniform coil pitch throughout the active length ensures predictable deflection and repeatable performance cycle after cycle.
Miniature outer diameters starting at 4 mm make these small compression springs ideal for tight-clearance bores and slender guide rods.
| Material | Carbon Steel |
|---|---|
| Surface Finish | Natural Steel (uncoated) |
| Wire Diameter | 0.7 mm / 0.8 mm (≈ 0.028–0.031 in) |
| Outer Diameter (OD) | 4 mm – 12 mm (≈ 0.16–0.47 in) |
| Free Length | 5 mm – 305 mm (≈ 0.20–12.0 in) — See variant options |
| Spring Type | Compression |
| End Type | See variant options |
| Spring Rate | See variant options |
| Quantity per Pack | 10 Pcs |
Match three dimensions: wire diameter (0.7 mm or 0.8 mm), outer diameter (4–12 mm), and free length (5–305 mm). The wire diameter determines stiffness — thicker wire produces a stiffer spring. The outer diameter must fit inside your bore or around your guide rod with clearance. The free length should exceed your required working length to allow adequate compression travel.
Load capacity depends on the specific wire diameter, outer diameter, and free length combination you select. Thinner wire (0.7 mm) and larger OD produce lower spring rates, while 0.8 mm wire with smaller OD yields higher rates. For precise load calculations, refer to the spring rate formula or contact us with your deflection and force requirements.
These springs are made from carbon steel with a natural (uncoated) finish. Carbon steel offers good mechanical properties but has limited corrosion resistance in humid or wet environments. For outdoor or high-moisture applications, consider applying a light coat of oil or grease, or contact us to inquire about alternative material options.
The inner diameter equals the outer diameter minus twice the wire diameter. For example, a 0.7 mm wire / 8 mm OD spring has an ID of approximately 6.6 mm. Use this formula to verify that the spring will clear your guide rod. Exact ID values for each size combination are available on request.
Yes. The compact outer diameters (starting at 4 mm) and short free lengths (from 5 mm) make these springs well-suited for battery contacts, push-button mechanisms, and PCB-mounted spring contacts. Ensure the spring's compressed length and force match your contact design requirements before ordering.
Choose 0.7 mm wire for lighter loads and more flexible deflection — ideal for delicate mechanisms, sensors, and low-force return applications. Choose 0.8 mm wire when you need a stiffer spring with higher load capacity for the same outer diameter and length. If you are unsure, start with 0.7 mm and test deflection under your target load before committing to a bulk order.
Absolutely. The miniature size range — OD from 4 mm to 12 mm and lengths from 5 mm — covers most suspension, throttle return, and linkage spring requirements found in scale models, RC cars, aircraft, and robotic assemblies. The 10-piece pack quantity is practical for prototyping and small-batch builds.
