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When a mechanism fails to return, a valve leaks, or a prototype loses its snap, the culprit is almost always an undersized or worn-out compression spring. Engineers, hobbyists, and repair technicians who need an exact-fit compression spring without ordering a custom batch will find this range covers the vast majority of real-world applications — from sub-millimeter wire gauges for delicate electronics to 6mm wire for heavy-duty industrial assemblies.
Each spring in this series is wound from stainless steel wire with diameters ranging from 0.5 mm to 6 mm (approx. 0.020" to 0.236"), outer diameters spanning 3 mm to 50 mm (approx. 0.118" to 1.969"), and a uniform free length of 305 mm (approx. 12.0"). The open-coil helical geometry delivers consistent linear spring rates and reliable axial compression across the full deflection range.
Typical use cases include compression spring replacement for 3D printer Z-axis beds, compression spring selection for robotics actuators and gripper mechanisms, and compression spring sizing for valve assemblies, jigs, and fixture clamps in light manufacturing environments.
118 variants spanning wire diameters 0.5–6 mm and ODs 3–50 mm let you match the exact geometry your design requires without custom tooling.
Wound from stainless steel wire for inherent corrosion resistance, making these springs suitable for humid, wet, or mildly chemical environments.
The 305 mm (12.0") free length provides generous working travel and can be cut to a shorter free length if your application demands it.
Open-coil helical winding maintains a linear force-deflection curve, ensuring predictable return force across repeated compression cycles.
From 3D printer beds and robotics grippers to valve assemblies and fixture clamps — one listing covers dozens of common engineering scenarios.
Order exactly the quantity you need — no minimum pack requirement — ideal for prototyping, repair, or low-volume production runs.
| Spring Type | Open-Coil Helical Compression Spring |
|---|---|
| Material | Stainless Steel Wire |
| Wire Diameter Range | 0.5 mm – 6 mm (0.020" – 0.236") |
| Outer Diameter (OD) Range | 3 mm – 50 mm (0.118" – 1.969") |
| Free Length | 305 mm (approx. 12.0") |
| Coil Direction | Right-hand (standard) |
| End Type | See variant options |
| Spring Rate | See variant options |
| Surface Finish | Natural stainless (no coating) |
| Quantity per Order | 1 piece per variant selected |
Start with three measurements: the bore or housing inner diameter (determines maximum OD), the shaft or guide rod outer diameter (determines minimum ID = OD minus 2× wire diameter), and the required free length and working travel. Match those to the variant options in this listing. If you need a specific spring rate, calculate it using the formula k = (G × d⁴) / (8 × D³ × n), where G is the shear modulus of stainless steel (~69 GPa), d is wire diameter, D is mean coil diameter, and n is the number of active coils.
Load capacity varies by wire diameter and OD combination. Thicker wire diameters (e.g., 4–6 mm) with smaller ODs produce stiffer springs with higher load ratings, while thin wire (0.5–1 mm) with larger ODs produce softer springs. Exact spring rates depend on the number of active coils, which varies per variant. Contact us to confirm load data for your specific size if needed.
Yes. These springs are wound from stainless steel wire, which provides good resistance to rust and oxidation in humid, wet, and mildly corrosive environments. For highly aggressive chemical environments (e.g., strong acids or chloride-heavy saltwater immersion), consider additional protective measures or consult us about material grade specifics.
Yes, stainless steel compression springs can be cut to a shorter free length using a rotary tool or spring cutter. After cutting, lightly grind or deburr the cut end to ensure flat seating. Note that cutting changes the number of active coils and therefore alters the spring rate — recalculate accordingly.
Yes, provided you select a variant whose OD fits within your housing bore with appropriate clearance (typically 0.5–1 mm radial clearance) and whose ID clears your guide rod. The 305 mm free length accommodates most standard spring seat assemblies. Always verify the selected OD and wire diameter against your mechanical drawings before ordering.
The variant name follows the format: Wire Diameter × OD × Length. For example, "1mm × 10mm × 305mm" means the wire itself is 1 mm thick, the spring's outer coil diameter is 10 mm, and the free length is 305 mm. The inner diameter (ID) is approximately OD minus 2× wire diameter (in this example, 10 − 2 = 8 mm ID).
Each order for a single variant includes 1 piece. If you need multiple pieces of the same size, simply increase the quantity in your cart. For bulk or wholesale inquiries, please contact us directly.
