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When a mechanism fails because a spring loses tension, corrodes, or snaps under load, the entire assembly pays the price. Engineers, makers, and maintenance technicians who need a dependable, corrosion-resistant compression spring in a precise size will find this range covers the widest selection of wire diameters and free lengths available in a single listing.
These compression springs are wound from 304 stainless steel wire with diameters ranging from 2 mm to 4 mm (approx. 0.079 in to 0.157 in). Outer diameters span 12 mm to 40 mm (approx. 0.47 in to 1.57 in), and free lengths run from 10 mm to 305 mm (approx. 0.39 in to 12 in). Each spring features closed and ground ends for stable seating and consistent load distribution. Quantity options of 1, 2, or 4 pieces per order let you stock exactly what you need.
Typical applications include CNC machine tool spring returns, 3D printer bed-leveling compression springs, robotic gripper shock absorption, jig and fixture clamping mechanisms, and general-purpose DIY hardware projects requiring a stainless steel compression spring with precise free length control.
Wound from 304-grade stainless steel wire for solid corrosion resistance in humid, wet, and mildly acidic environments — a reliable choice for outdoor fixtures, food-adjacent equipment, and marine-adjacent applications.
Wire diameters from 2 mm to 4 mm, outer diameters from 12 mm to 40 mm, and free lengths from 10 mm to 305 mm give you a single source for dozens of spring specifications without sourcing from multiple suppliers.
Both ends are closed and ground flat, providing a stable bearing surface that seats squarely in spring pockets and against flat plates — reducing lateral deflection under compression load.
Uniform wire diameter and coil pitch across each size deliver a predictable linear spring rate, making these springs suitable for load-sensitive mechanisms such as valve returns, plunger assemblies, and precision fixtures.
Order 1, 2, or 4 pieces per variant to match prototyping, repair, or small-batch production needs — reducing waste and letting you test fit before committing to larger quantities.
Designed for repeated compression-and-release cycles, these springs maintain their free length and load characteristics over extended service life in mechanical assemblies requiring consistent return force.
| Material | 304 Stainless Steel |
|---|---|
| Wire Diameter (CS) | 2 mm, 2.5 mm, 3 mm, 4 mm (see variant options) |
| Outer Diameter (OD) | 12 mm – 40 mm (see variant options) |
| Free Length (L) | 10 mm – 305 mm (see variant options) |
| End Type | Closed and Ground |
| Wind Direction | Right-hand (typical for standard compression springs) |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Quantity per Order | 1 Pcs / 2 Pcs / 4 Pcs (see variant options) |
| Operating Temperature | Typically –20°C to +200°C (–4°F to +392°F) |
Select your spring using three dimensions shown in the SIZE(CSxODxL) variant label: CS = wire (coil) diameter, OD = outer diameter, L = free length. Match the OD to your bore or housing inner diameter (leave 0.5–1 mm clearance), match the free length to your required travel plus solid height, and choose a wire diameter that delivers the load you need. If you are unsure, contact us to confirm before ordering.
Load capacity varies by wire diameter, outer diameter, free length, and number of active coils. Larger wire diameters (e.g., 3 mm or 4 mm) and shorter free lengths generally produce higher spring rates and load capacities. For specific spring rate and maximum load data for your chosen variant, contact us to confirm.
304 stainless steel offers solid resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for outdoor fixtures, humid workshops, and food-adjacent equipment. For highly aggressive environments such as saltwater immersion or strong acids, 316 stainless steel would be a stronger choice — these springs are 304 grade.
Yes. These are a popular choice for 3D printer bed-leveling compression springs (typically 2×OD×L variants in the 10–50 mm free length range) and CNC machine tool spring returns. Select the OD and free length that matches your printer or machine's spring seat dimensions. The closed and ground ends seat flat against the bed and carriage surfaces.
The QTY(pcs) option lets you choose how many springs arrive in your order. 1 Pcs is ideal for single-unit repairs or prototyping. 2 Pcs suits paired installations (e.g., two springs on a fixture). 4 Pcs is suited for small-batch builds or keeping spares on hand. All pieces in a single order are the same size as specified by the SIZE variant.
Use calipers to measure: (1) wire diameter (CS) — measure the thickness of the wire itself; (2) outer diameter (OD) — measure across the widest point of the coil; (3) free length (L) — measure the spring at rest, uncompressed. Match these three values to the SIZE(CSxODxL) variant label. If your measurement falls between listed sizes, choose the closest available size or contact us for guidance.
Standard compression springs in this range are wound right-hand (clockwise when viewed from the top). This is the most common wind direction and is compatible with the vast majority of spring seats, plunger housings, and fixture pockets. If your application specifically requires left-hand wind, contact us to confirm availability.
