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When a project demands consistent return force without the risk of rust or premature fatigue, finding the right compression spring becomes critical. Engineers, hobbyists, and maintenance professionals who work in damp, outdoor, or chemically exposed environments know the frustration of carbon-steel springs that corrode and lose tension after just a few cycles. These A2 304 stainless steel compression springs are engineered specifically for those demanding conditions.
Each spring in this listing features a wire diameter of 1.4mm and is available in outer diameters (OD) ranging from 10mm to 22mm (~0.39 in to ~0.87 in), with free lengths spanning 10mm to 50mm (~0.39 in to ~1.97 in). The coil body is formed from A2-grade 304 stainless steel wire, offering a balanced combination of tensile strength, corrosion resistance, and workability. Springs are sold in packs of 10 pieces per order.
Typical applications include DIY mechanical assemblies requiring a small-diameter return spring, electronic enclosure latches and push-button mechanisms, light-load valve and actuator assemblies, and model-making or robotics projects where compact stainless compression springs for 1.4mm wire diameter are specified. The wide OD and length matrix lets you dial in the exact spring rate needed for your design.
Formed from A2-grade 304 stainless steel wire for strong corrosion resistance in wet, humid, and mildly acidic environments — far outlasting uncoated carbon-steel alternatives.
Consistent 1.4mm wire cross-section across all variants ensures predictable spring rates and reliable seating in guide bores or on guide pins designed for this wire gauge.
OD options from 10mm to 22mm and free lengths from 10mm to 50mm give you a broad selection matrix to match exact dimensional requirements without custom fabrication.
Close-wound coil geometry and uniform wire diameter deliver repeatable deflection characteristics, making these springs suitable for precision mechanical and electronic assemblies.
Each order ships 10 pieces of your selected size, giving you spares for prototyping, repair stock, or multi-unit builds without overpaying for bulk quantities.
Suited for push-button mechanisms, valve assemblies, robotics, model engineering, and general-purpose spring replacement wherever a compact stainless compression spring is required.
| Material | A2 304 Stainless Steel |
|---|---|
| Wire Diameter | 1.4mm (~0.055 in) |
| Outer Diameter (OD) | 10mm – 22mm (~0.39 in – 0.87 in) |
| Free Length | 10mm – 50mm (~0.39 in – 1.97 in) |
| Spring Type | Compression (open-coil) |
| End Type | See variant options |
| Surface Finish | Natural stainless (uncoated) |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Quantity per Pack | 10 pieces |
| Operating Temperature | Typically –20°C to +300°C (–4°F to +572°F) |
| Corrosion Resistance | Good — suitable for damp and mildly corrosive environments |
Start with the bore or guide-pin diameter in your assembly. The spring OD should be slightly smaller than the bore (typically 0.5–1mm clearance) or slightly larger than the guide pin. For free length, choose a spring that is 20–30% longer than your required compressed length to ensure adequate preload and travel without fully coil-binding.
Load capacity depends on OD, free length, and number of active coils — all of which vary by variant. As a general guide, 1.4mm wire springs in this size range are suited for light-to-medium loads, typically in the range of a few Newtons up to around 20–30N depending on deflection. Check the specific variant's spring rate if precise load data is required, or contact us to confirm.
A2 304 stainless steel offers good corrosion resistance in most outdoor and mildly saline environments. For full marine immersion or highly chlorinated environments, A4 316 stainless steel would be a more appropriate choice. For general outdoor, garden, or light-exposure applications, 304 stainless performs reliably.
A2 (304 grade) stainless steel is the most common stainless alloy, offering good corrosion resistance and strength for most applications. A4 (316 grade) adds molybdenum for enhanced resistance to chlorides and salt water. For standard DIY, mechanical, and indoor/outdoor use, A2 is sufficient. A4 is recommended only for aggressive marine or chemical environments.
304 stainless steel compression springs typically perform reliably from –20°C to approximately +300°C (–4°F to +572°F). For continuous operation above 250°C or in cryogenic conditions, consult a spring engineer, as elevated temperatures can cause stress relaxation and reduce the effective spring rate over time.
Springs are consumable components — they can fatigue, get lost during assembly, or be needed in multiples for symmetric designs. Buying a pack of 10 ensures you have spares on hand for repairs, prototyping iterations, or multi-spring assemblies without waiting for a reorder. It also reduces the per-unit cost compared to single-piece pricing.
Use a digital caliper to measure: (1) wire diameter — measure the cross-section of a single coil; (2) outer diameter — measure across the widest point of the coil; (3) free length — measure the spring at rest, uncompressed. Match all three dimensions to the variant options listed above. If your existing spring is worn or deformed, measure the bore/guide instead and use the clearance guidelines to select the correct OD.
