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Finding the right miniature compression spring for a tight-tolerance application is a frustrating experience — wrong wire diameter, wrong free length, and the whole assembly fails. Whether you are a hobbyist repairing a pen mechanism, an engineer prototyping a sensor housing, or a maker building a custom switch, these small compression springs give you the exact geometry you need without ordering a custom batch.
Each spring is formed from steel wire with a diameter of 1 mm or 1.2 mm. The outer diameter (OD) ranges from 5 mm to 20 mm (approximately 0.20 in to 0.79 in), and the free length spans 60 mm to 100 mm (approximately 2.36 in to 3.94 in). Springs are available in packs of 5, 10, or 25 pieces to suit both one-off repairs and small-batch production runs.
Typical use cases include spring-loaded battery contacts in portable electronics, return mechanisms in DIY push-button assemblies, and light-load suspension elements in scale models or robotics projects — all scenarios where a compact, consistent compression spring is essential.
Wire dia. 1 mm and 1.2 mm combined with OD 5–20 mm and free lengths 60–100 mm give you over 200 size combinations in one listing.
Formed from steel wire for reliable spring-back force and consistent deflection across repeated compression cycles.
Choose 5, 10, or 25 pieces per order — ideal for prototyping, repair, or small-batch production without over-buying.
Consistent wire diameter and coil pitch ensure predictable spring rate and reliable fit in close-tolerance bores and housings.
End coils are closed to provide a flat seating surface, reducing lateral buckling and improving load distribution in guided applications.
Used in electronics, mechanical assemblies, robotics, scale models, and general DIY projects where a compact compression spring is required.
| Spring Type | Compression Spring |
|---|---|
| Wire Diameter | 1 mm / 1.2 mm (see variant options) |
| Outer Diameter (OD) | 5 mm – 20 mm (see variant options) |
| Free Length | 60 mm – 100 mm (see variant options) |
| Material | Steel |
| End Type | Closed ends |
| Coil Direction | Right-hand |
| Surface Finish | See variant options |
| Spring Rate | See variant options |
| Pack Quantity | 5 / 10 / 25 pcs (see variant options) |
Start with the bore or housing inner diameter — your spring's OD should be 0.5–1 mm smaller than the bore for a guided fit. Then select the wire diameter based on the load you need: 1 mm wire suits lighter loads, while 1.2 mm wire handles slightly higher forces. Finally, choose a free length that gives you the travel (compression distance) you need with some preload margin.
These springs are formed from steel wire. Steel compression springs offer a good balance of spring rate, fatigue life, and dimensional stability for general-purpose mechanical and electronic applications. They are suitable for moderate cyclic loading in dry indoor environments.
Standard steel springs have limited corrosion resistance. For outdoor or high-humidity environments, we recommend applying a light coat of oil or grease, or selecting a stainless steel alternative. Contact us if you need corrosion-resistant variants for your specific application.
Wire diameter directly affects spring rate (stiffness). A 1.2 mm wire diameter spring will be stiffer and carry a higher load at the same deflection compared to a 1 mm wire spring of the same OD and free length. Choose 1 mm for lighter-touch applications (pen mechanisms, small switches) and 1.2 mm for slightly higher-force requirements (battery contacts, return mechanisms).
Yes. The small OD range (5–20 mm) and wire diameters (1–1.2 mm) make these springs well-suited for spring-loaded battery contacts, pen and stylus mechanisms, push-button return assemblies, and similar compact applications. Select the OD and free length that match your housing dimensions.
Choose 5 pcs for a one-off repair or prototype where you need a spare or two. Choose 10 pcs for small-batch builds or when you want extras on hand. Choose 25 pcs for production runs, classroom projects, or when you want the best per-unit value. All pack sizes ship the same spring — only the quantity differs.
Absolutely. The compact dimensions and consistent spring rate make these ideal for robotics joints, gripper return mechanisms, scale model suspension, and similar maker applications. The wide size matrix means you can find a spring that fits your specific geometry without custom fabrication.
