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When a mechanism fails to return, a valve sticks, or a jig loses its tension, the culprit is almost always an undersized or corroded spring. Engineers, makers, and repair technicians who need a dependable, corrosion-resistant compression spring in a compact form factor will find this set covers the most common metric sizes in a single order.
Each pack contains 5 identical compression springs machined from 304 stainless steel wire. Wire diameter ranges from 0.5 mm to 1.4 mm (approximately 0.020–0.055 in), outer diameter from 5 mm to 20 mm (approximately 0.20–0.79 in), and free length from 60 mm to 100 mm (approximately 2.36–3.94 in) depending on the variant selected. The open-coil helical design provides linear load deflection across the full compression range.
Typical use cases include CNC machine tool return mechanisms, 3D printer bed leveling assemblies, robotics joint preload, electronics enclosure latches, and general-purpose DIY fixture clamping — anywhere a stainless steel compression spring with a defined free length is required.
Formed from 304-grade stainless steel wire for solid corrosion resistance in humid, mildly acidic, and outdoor environments without surface treatment.
Wire diameter 0.5–1.4 mm × outer diameter 5–20 mm × free length 60–100 mm — over 160 variant combinations to match your exact bore and stroke requirement.
Each order ships 5 identical springs, giving you spares for prototyping, replacement, or multi-axis assemblies without buying in bulk.
Open-coil helical geometry delivers consistent, predictable spring rate across the compression stroke — essential for repeatable clamping and return-force applications.
Closed and ground ends (typical for this size class) seat flat against mating surfaces, reducing lateral deflection and improving load alignment in guided assemblies.
Sized for common metric hardware — fits standard spring pockets and guide rods used in CNC routers, 3D printers, robotic joints, and bench-top fixtures.
| Material | 304 Stainless Steel |
|---|---|
| Spring Type | Compression (helical, open coil) |
| Wire Diameter | 0.5 mm / 0.6 mm / 0.7 mm / 0.8 mm / 1.0 mm / 1.2 mm / 1.4 mm |
| Outer Diameter | 5 mm – 20 mm (see variant options) |
| Free Length | 60 mm / 70 mm / 80 mm / 90 mm / 100 mm |
| Quantity per Pack | 5 pcs |
| Spring Rate | See variant options |
| Surface Finish | Natural (no coating) |
| End Type | See variant options |
| Operating Temperature | Typically –20 °C to +200 °C (–4 °F to +392 °F) |
Start with the bore (hole) or guide rod diameter in your assembly. The spring's outer diameter should be 0.5–1 mm smaller than the bore for a guided fit, or 0.5–1 mm larger than the guide rod for a rod-guided fit. Then select a wire diameter that provides the load you need — thicker wire = higher spring rate. If you are unsure, order two adjacent wire diameters to compare stiffness on your bench.
Load capacity depends on the specific wire diameter, outer diameter, and free length combination. Thicker wire and smaller outer diameter increase the spring rate (N/mm). For light-duty return mechanisms (e.g., 3D printer bed clips, small latches), 0.5–0.8 mm wire is typically sufficient. For moderate clamping or preload in CNC fixtures, 1.0–1.4 mm wire is more appropriate. Contact us with your required load and deflection if you need a calculated spring rate.
Yes. 304 stainless steel provides solid resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is suitable for humid workshops, outdoor enclosures, and light marine environments. For highly saline or strongly acidic conditions, 316 stainless steel would be a better choice — contact us if you need that grade.
Yes — these are a popular choice for 3D printer bed leveling (typically 0.5–0.8 mm wire, 5–8 mm OD, 60–80 mm free length) and CNC router Z-axis return or tool-change mechanisms. Match the outer diameter to your existing spring pocket and verify the free length provides adequate preload at your working compression.
Free length is the spring's uncompressed length — the dimension listed in the product title (60, 70, 80, 90, or 100 mm). Working length is the compressed length when installed under load. The difference between free length and working length is the deflection, and multiplying deflection by the spring rate gives you the load force. Always leave at least 15–20% of free length as solid-height clearance to avoid coil bind.
304 stainless steel springs exhibit low relaxation (stress relaxation) under static loads at room temperature. For dynamic cycling applications, fatigue life depends on the stress ratio and deflection amplitude. These springs are designed for general-purpose use; if your application involves millions of cycles at high deflection, consult us for a fatigue-rated specification.
Measure three dimensions on the old spring: (1) wire diameter with calipers, (2) outer diameter across the coils, and (3) free length when uncompressed. Match these to the closest variant in our size matrix. If the original spring is already compressed in the assembly, measure the installed length and add the expected deflection to estimate free length.
