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When a mechanism fails because a spring loses tension too soon, the cost is more than just the part — it's downtime, rework, and frustration. Engineers, hobbyists, and repair technicians who need a dependable 70mm compression spring with consistent load characteristics will find this range purpose-built for exactly that demand.
Each spring in this series is wound to a free length of 70mm (approximately 2.76 inches), with wire diameters ranging from 0.5mm to 1.8mm (0.020"–0.071") and outer diameters spanning 3mm to 30mm (0.12"–1.18"). Available in spring steel, stainless steel, and zinc-plated (zincification) finishes, sold in packs of 1, 2, or 5 pieces depending on the variant selected.
Typical applications include DIY mechanical assemblies requiring controlled return force, electronics enclosure latches and button mechanisms, light-duty industrial jigs and fixtures, and prototype or maker projects where precise spring sizing is critical.
| Free Length | 70 mm (approx. 2.76 in) |
|---|---|
| Wire Diameter | 0.5 mm – 1.8 mm (0.020" – 0.071") |
| Outer Diameter (OD) | 3 mm – 30 mm (0.12" – 1.18") |
| Material | Spring Steel / Stainless Steel / Zinc-Plated Steel |
| End Type | Closed (typical; see variant options) |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Surface Finish | Natural / Stainless / Zinc-Plated |
| Pack Quantity | 1 pc / 2 pcs / 5 pcs (select above) |
| Weight (per piece) | See variant options |
Wire diameter directly affects spring rate and load capacity. Thinner wire (0.5–0.8mm) suits light-load applications such as button returns or small latches. Heavier wire (1.2–1.8mm) provides stronger return force for mechanical assemblies under greater load. If you know your required spring rate or load, match it to the wire diameter; otherwise, start with a mid-range option (0.9–1.0mm) and test deflection under your working load.
Spring steel offers excellent elasticity and fatigue resistance at a lower cost, making it ideal for dry indoor environments. Stainless steel provides superior corrosion resistance and is recommended for humid, wet, or chemically exposed environments. If your application involves outdoor exposure, food-adjacent equipment, or regular moisture contact, stainless steel is the more durable choice.
Zinc plating provides moderate corrosion resistance — better than bare spring steel but less than stainless steel. It is suitable for occasional moisture exposure or mildly humid indoor environments. For prolonged outdoor or marine exposure, stainless steel is recommended instead.
The outer diameter (OD) listed in the variant options is the nominal uncompressed OD. For a spring guided by an inner bore, the OD should be slightly smaller than the bore diameter (typically 0.5–1mm clearance). For a spring guided over a pin, the inner diameter (ID = OD minus 2× wire diameter) should be slightly larger than the pin diameter. Use the variant selector above to choose the OD that matches your assembly dimensions.
Standard spring steel and zinc-plated variants are suitable for typical ambient temperatures up to approximately 120°C (248°F). Stainless steel variants offer slightly better heat tolerance. For applications exceeding these ranges, contact us to confirm suitability before ordering.
Ordering a 5-pack reduces per-unit cost and ensures you have spares on hand for prototyping iterations, replacements, or parallel builds. For production runs or recurring maintenance tasks, having extra springs in stock prevents project delays caused by a single spring failure or loss during assembly.
Closed-end springs have the last coil wound tightly against the adjacent coil, creating a flat seating surface. This allows the spring to sit squarely on a flat surface or in a spring pocket without tilting, which is important for consistent load transfer. Most general-purpose compression spring applications benefit from closed ends. If your design requires open ends, contact us to confirm availability.
