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When a spring fails mid-project — whether in a jig, fixture, valve, or small mechanism — finding an exact replacement with the right wire diameter and outer diameter is rarely straightforward. These 35mm long compression springs are designed for makers, engineers, and repair technicians who need reliable, dimensionally consistent coiled springs without ordering in bulk. Available in wire diameters from 0.2 mm to 1.4 mm and outer diameters from 1.5 mm to 25 mm, there is a combination suited to most light-to-medium load applications.
Each spring is a helical compression coil wound from round wire stock. The free length is 35 mm (approximately 1.38 inches). Wire diameters span 0.2 mm–1.4 mm (approx. 0.008"–0.055") and outer diameters range from 1.5 mm–25 mm (approx. 0.06"–0.98"). Material options include 304 stainless steel, spring steel (carbon steel), and zinc-plated carbon steel. Packs are sold in 10-piece (stainless and spring steel) or 5-piece (zinc) quantities.
Typical use cases include: replacement compression springs for 3D printer extruder assemblies and bed leveling; return springs in small pneumatic or hydraulic valves; preload springs in CNC router Z-axis floating heads; and cushioning springs in DIY robotics grippers or end-effectors requiring consistent, repeatable force.
| Spring Type | Helical Compression |
|---|---|
| Free Length | 35 mm (≈ 1.38 in) |
| Wire Diameter Range | 0.2 mm – 1.4 mm (≈ 0.008" – 0.055") |
| Outer Diameter Range | 1.5 mm – 25 mm (≈ 0.06" – 0.98") |
| Material Options | 304 Stainless Steel / Spring Steel (Carbon) / Zinc-Plated Carbon Steel |
| End Type | See variant options |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Surface Finish | Natural (Stainless) / Natural (Spring Steel) / Zinc Plated |
| Pack Quantity | 10 pcs (Stainless & Spring Steel) / 5 pcs (Zinc) |
| Operating Temperature | See variant options |
Start with the space constraints: measure the bore or housing inner diameter to determine the maximum allowable outer diameter of the spring, then subtract 0.5–1 mm for clearance. Next, estimate the load you need the spring to exert at a given compressed length. Thicker wire diameters produce stiffer springs with higher spring rates; thinner wire diameters produce softer springs. If you are replacing an existing spring, match the free length (35 mm), outer diameter, and wire diameter as closely as possible to the original.
304 stainless steel offers good corrosion resistance, making it suitable for humid environments, outdoor exposure, or applications where rust is a concern. Spring steel (high-carbon steel) typically provides a higher elastic modulus and better fatigue resistance under repeated cycling, making it preferred for high-cycle mechanical applications. Zinc-plated carbon steel offers basic corrosion protection for general indoor use at a lower price point. Choose based on your environment and duty cycle requirements.
The 304 stainless steel variants provide the best corrosion resistance among the three material options and are suitable for moderately humid or occasionally wet environments. Spring steel (carbon steel) variants are not inherently corrosion-resistant and should be used in dry or protected indoor environments, or coated after installation. Zinc-plated variants offer basic protection against light moisture but are not recommended for prolonged outdoor or submerged use.
These springs are compatible with a wide range of light-to-medium duty applications including: 3D printer bed leveling and extruder assemblies, CNC router Z-axis floating spindle heads, small pneumatic and hydraulic valve return mechanisms, robotics gripper preload elements, jig and fixture clamping systems, electronic enclosure latches, and general DIY mechanical projects. Always verify that the outer diameter, inner diameter clearance, free length, and spring rate match your specific design requirements.
A spring that is too stiff will require excessive force to compress to the working length, potentially overloading the mechanism or making manual operation difficult. A spring that is too soft will not provide enough return force, causing the mechanism to feel loose or fail to return to its rest position. As a general guide: for light-touch applications (e.g., button returns, small latches), choose thinner wire diameters; for load-bearing or high-force applications (e.g., valve seats, clamping fixtures), choose thicker wire diameters. If in doubt, order a small pack of two or three wire diameter options and test before committing to a larger quantity.
Yes. These 35mm compression springs are commonly used in 3D printer bed leveling assemblies (typically 0.4–0.5 mm wire, 6–8 mm outer diameter) and CNC floating spindle or drag knife heads (typically 0.6–1.0 mm wire, 8–15 mm outer diameter). Select the stainless steel variant for environments with moisture or cutting fluid exposure, and the spring steel variant for high-cycle applications where fatigue life is a priority. Always confirm the outer diameter fits your spring pocket and the free length suits your travel range.
Stainless steel and spring steel variants are sold in packs of 10 pieces. Zinc-plated variants are sold in packs of 5 pieces. Single-piece ordering is not available for this listing. The multi-piece pack format is designed to provide spares for prototyping, repair, or small-batch production without requiring a large minimum order quantity.
