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When a repair stalls because the right spring is nowhere to be found, or a prototype fails because the coil collapses under load, the root cause is almost always a mismatch between wire diameter and outer diameter. Engineers, hobbyists, and maintenance technicians who work with mechanical assemblies, jigs, or custom fixtures need a compression spring they can spec with confidence — and receive in the exact dimension they ordered.
These 305mm length stainless steel compression springs are wound from corrosion-resistant stainless steel wire in diameters ranging from 0.3 mm to 4 mm (approximately 0.012 in to 0.157 in), with outer diameters spanning 3 mm to 40 mm (approximately 0.118 in to 1.575 in). Each spring is a closed-coil helical design with a natural free length of 305 mm (approximately 12 in), giving you a long working stroke that can be cut to a shorter free length on-site if needed.
Typical applications include DIY mechanical assemblies requiring consistent return force, prototype and maker-space builds where off-the-shelf spring kits fall short, light industrial jigs and fixtures needing corrosion-resistant coil springs, and repair or replacement of worn compression springs in appliances, tools, and equipment.
Wire diameters from 0.3 mm to 4 mm paired with outer diameters from 3 mm to 40 mm — one listing covers dozens of load and fit combinations.
Wound from stainless steel wire for resistance to oxidation, moisture, and mild chemical exposure — suitable for both indoor and outdoor mechanical environments.
A generous 305 mm (≈12 in) free length provides a long working stroke and allows on-site trimming to a shorter length when your application demands it.
Uniform coil pitch and wire cross-section deliver a predictable, linear spring rate — critical for repeatable clamping, return-force, and cushioning applications.
Closed and ground ends (typical for this spring class) provide flat seating surfaces that distribute load evenly and reduce lateral buckling under compression.
Available in 1 PCS or 2 PCS per order — stock a spare or tackle a paired-spring application without placing two separate orders.
| Material | Stainless Steel |
|---|---|
| Free Length | 305 mm (≈ 12 in) |
| Wire Diameter Range | 0.3 mm – 4 mm (≈ 0.012 in – 0.157 in) |
| Outer Diameter Range | 3 mm – 40 mm (≈ 0.118 in – 1.575 in) |
| Spring Type | Helical Compression Spring |
| End Style | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Spring Rate | See variant options |
| Max Load Capacity | See variant options |
| Quantity per Pack | 1 PCS or 2 PCS (select above) |
Start with the outer diameter (OD) — it must fit inside your housing bore or around your guide rod with a small clearance (typically 0.5–1 mm per side). Then select the wire diameter based on the load you need: thicker wire (e.g., 2–4 mm) produces a stiffer spring with higher load capacity, while thinner wire (e.g., 0.3–0.8 mm) gives a lighter, more flexible spring. If you are unsure, contact us with your bore size, rod diameter, and required load and we can help narrow down the options.
The load capacity varies significantly across the size range. Larger wire diameters (3–4 mm) with smaller outer diameters produce the stiffest springs and are suitable for moderate industrial clamping and return-force applications. Smaller wire diameters (0.3–0.8 mm) are better suited for light-duty mechanisms, electronics, and precision instruments. For heavy-duty industrial applications requiring certified load data, please contact us to confirm suitability before ordering.
Stainless steel offers significantly better corrosion resistance than carbon steel springs. These springs are suitable for humid environments, light outdoor exposure, and mild chemical contact. However, stainless steel is not fully immune to corrosion in highly saline or acidic environments (e.g., marine splash zones or chemical processing). For extreme corrosion environments, consider a protective coating or a higher-grade alloy.
Yes. Compression springs can be cut to a shorter free length using a rotary tool or spring cutter. After cutting, the end coil may need to be ground flat to restore even seating. Keep in mind that cutting changes the spring rate and load capacity proportionally — a spring cut to half its free length will have approximately twice the spring rate. Plan your cut length accordingly.
Measure the original spring's free length, outer diameter, and wire diameter with calipers. Then match those three dimensions to the closest available variant in this listing. If the original spring is slightly compressed in its installed position (pre-load), also measure the installed length to understand the working deflection. Select a variant whose OD and wire diameter match, and whose 305 mm free length gives you enough stroke for your application.
Both options ship the same spring in the same dimension — the only difference is quantity. The 1 PCS option is ideal when you need a single replacement or are prototyping. The 2 PCS option is useful when your design uses paired springs (e.g., symmetrical clamping fixtures) or when you want a spare on hand. The per-unit price is slightly lower with the 2 PCS pack.
All springs in this listing are made from stainless steel wire with a natural (uncoated) finish. The stainless surface provides inherent corrosion resistance without the need for additional plating or coating. If you require a specific alloy grade (e.g., 302, 304, or 316 stainless) for your application, please contact us to confirm the material specification before ordering.
