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When a project demands consistent return force — whether you're repairing a mechanism, building a custom jig, or replacing a worn-out spring in a tool — finding the right compression spring in the right size is the real challenge. These steel compression coil springs are designed for engineers, hobbyists, and repair technicians who need a broad selection of precisely sized options without ordering in bulk.
Each spring is formed from carbon steel wire with a smooth, uniform coil. Wire diameters range from 0.3 mm to 4.0 mm (approx. 0.012" to 0.157"), outer diameters from 2.0 mm to 43 mm (approx. 0.079" to 1.693"), and all springs share a consistent free length of 300 mm (approx. 11.81"). Ends are typically closed and ground for stable seating.
Typical use cases include compression spring replacement for mechanical assemblies, custom spring-loaded fixtures for DIY automation projects, and load-bearing coil spring applications in small appliances, valves, and precision instruments.
Wire dia 0.3–4.0 mm, OD 2.0–43 mm, free length 300 mm — one listing covers hundreds of size combinations for precise fitment.
Formed from carbon steel wire for consistent elasticity and reliable return force across repeated compression cycles.
Closed and typically ground end coils provide a flat, stable seating surface for accurate load distribution in spring housings.
Uniform coil pitch throughout the spring body ensures even load distribution and predictable deflection behavior under compression.
Suitable for mechanical assemblies, DIY fixtures, valve mechanisms, small appliances, and precision instruments requiring controlled spring force.
Available in 1 Pcs quantity — order exactly what you need for prototyping, repair, or replacement without committing to large minimum quantities.
| Material | Carbon Steel |
|---|---|
| Wire Diameter | 0.3 mm – 4.0 mm (0.012" – 0.157") |
| Outer Diameter | 2.0 mm – 43 mm (0.079" – 1.693") |
| Free Length | 300 mm (11.81") |
| End Type | Closed and Ground (typical) |
| Coil Direction | Right-hand (typical) |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Weight | See variant options |
| Quantity | 1 Pcs per order |
Match three key dimensions: wire diameter (determines stiffness and load capacity), outer diameter (must fit inside your spring housing with clearance), and free length (the uncompressed length — 300 mm for all variants here). If you need a specific spring rate, calculate the required wire dia and OD combination using standard spring rate formulas, or contact us to confirm before ordering.
These springs are formed from carbon steel wire. Carbon steel offers a good balance of tensile strength, elasticity, and cost-effectiveness for general mechanical and DIY applications. If your application requires stainless steel for corrosion resistance, please check our other listings or contact us to confirm material availability for your specific size.
Carbon steel springs have limited inherent corrosion resistance. For indoor, dry, or low-humidity environments they perform reliably. For outdoor, wet, or chemically exposed environments, consider applying a protective coating after installation, or contact us to inquire about alternative material options for your size range.
The variant naming follows the format: Wire Diameter × Outer Diameter × Free Length, all in millimeters. For example, "1.0×10×300mm" means a wire diameter of 1.0 mm, an outer diameter of 10 mm, and a free length of 300 mm. The inner diameter equals the outer diameter minus twice the wire diameter (e.g., 10 – 2×1.0 = 8 mm inner diameter).
These springs are suitable for light to moderate industrial applications, DIY automation fixtures, and mechanical assemblies. For heavy-duty or safety-critical industrial machinery, verify the spring rate, load capacity, and fatigue life requirements against your engineering specifications. Contact us if you need technical data sheets for a specific size.
The inner diameter (ID) can be calculated as: ID = Outer Diameter − (2 × Wire Diameter). For example, a 1.5×12×300mm spring has an ID of 12 − (2 × 1.5) = 9 mm. Use this to verify that the spring will fit over a guide rod or inside a housing bore in your assembly.
Each listing is sold as 1 Pcs per order, allowing you to order exactly the quantity you need. If you require larger quantities or multi-piece packs for production or wholesale purposes, please contact us directly to discuss volume pricing options.
