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When a repair stalls because you can't find a spring in the right size, the whole project grinds to a halt. Whether you're a hands-on DIYer rebuilding a mechanism, a technician servicing equipment, or an engineer prototyping a new assembly, having the exact compression spring on hand makes all the difference. These small compression springs are designed for anyone who needs reliable, consistent spring force in a compact form factor.
Each spring is manufactured from either stainless steel (grade 304) or spring steel, with an outer diameter ranging from 4 mm to 13 mm (approximately 5/32" to 1/2") and a free length spanning 5 mm to 70 mm (approximately 3/16" to 2-3/4"). Wire diameters available include 0.5 mm, 1.0 mm, 1.5 mm, and select sizes up to 1.5 mm depending on the diameter chosen. Packs are offered in quantities of 2, 5, or 10 pieces per order.
These compression springs suit a wide range of applications: replacing worn-out springs in door latches, cabinet mechanisms, and pen assemblies; providing return force in small actuators and valves; acting as cushioning elements in jigs and fixtures; and serving as load-bearing components in hobby robotics and RC vehicle builds. Their compact size also makes them ideal for use in precision instruments and electronic enclosures where space is limited.
Outer diameters from 4 mm to 13 mm and free lengths from 5 mm to 70 mm cover a broad spectrum of small-spring applications in a single listing.
Choose stainless steel for corrosion resistance in damp or outdoor environments, or spring steel for applications where higher elasticity and fatigue life are the priority.
Wire diameters of 0.5 mm, 1.0 mm, and 1.5 mm let you match the spring rate to your load requirements without over-engineering the assembly.
Order 2, 5, or 10 pieces depending on whether you need a single replacement or a workshop stock of spares — no need to buy more than you need.
Closed and ground ends on applicable sizes ensure flat, stable seating surfaces that distribute load evenly and reduce lateral deflection during compression.
Suitable for door latches, pen mechanisms, valves, actuators, jigs, hobby robotics, RC vehicles, and precision instruments where a compact return-force element is needed.
| Product Type | Compression Spring |
|---|---|
| Outer Diameter Range | 4 mm – 13 mm (approx. 5/32" – 1/2") |
| Free Length Range | 5 mm – 70 mm (approx. 3/16" – 2-3/4") |
| Wire Diameter Options | 0.5 mm, 1.0 mm, 1.5 mm (varies by diameter) |
| Material Options | Stainless Steel (304) / Spring Steel |
| Pack Quantity Options | 2 pcs / 5 pcs / 10 pcs |
| Spring Type | Compression (open coil) |
| End Type | See variant options |
| Surface Finish | See variant options |
| Weight (per piece) | See variant options |
Measure the bore or housing that the spring will sit inside, then select an outer diameter that is slightly smaller — typically 0.2 mm to 0.5 mm of clearance is sufficient for most applications. If the spring sits over a rod or pin, measure the rod and choose an inner diameter (outer diameter minus twice the wire diameter) that provides similar clearance.
Stainless steel (304 grade) offers good corrosion resistance, making it suitable for humid, wet, or mildly corrosive environments such as outdoor mechanisms or food-adjacent equipment. Spring steel has a higher carbon content, which typically delivers a higher elastic modulus and better fatigue life under repeated cycling — making it a strong choice for high-cycle mechanical applications where corrosion is not a concern.
Stainless steel variants resist rust in most everyday environments, including exposure to moisture and mild chemicals. Spring steel variants are more susceptible to surface oxidation if left unprotected in wet conditions; applying a light coat of machine oil or grease can extend their service life significantly in such environments.
Measure the original spring's free length (uncompressed height), outer diameter, and wire diameter using a caliper. Match these three dimensions as closely as possible. If the original spring is unavailable, note the compressed length under load and the approximate force required — this helps narrow down the wire diameter, as thicker wire produces a stiffer spring rate.
These are general-purpose compression springs with standard coil geometry. They are compatible with most flat spring seats and simple retainer designs. For applications with specific retainer grooves or precision-machined seats, verify the outer diameter and end-type specifications against your retainer dimensions before ordering.
Yes — select the stainless steel material option for outdoor or high-humidity use. Stainless steel 304 provides adequate corrosion resistance for most outdoor DIY and light industrial applications. For highly aggressive environments (salt spray, chemical exposure), consider additional protective coatings or consult a specialist for the appropriate spring grade.
For a single repair or replacement, the 2-piece or 5-piece pack is usually sufficient and avoids unnecessary surplus. If you work on equipment regularly or need spares on hand for future maintenance, the 10-piece pack offers better value per unit and ensures you have replacements ready without reordering delays.
