Spring Steel Small Compression Spring 0.2/0.3/0.4mm Wire Diameter 3-50mm Length

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Spring Steel Small Compression Spring 0.2/0.3/0.4mm Wire Diameter 3-50mm Length

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By HomeDIYer®

Size: 0.2mm x 1.5mm x 5mm

Pack of Quantity (Pcs): 10

Price:

$8.01 USD

Stock:

In stock (500 units), ready to be shipped

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Spring Steel Small Compression Springs — Precision Micro Coils for Tight-Tolerance Applications

When a failed return mechanism stalls your project or a worn-out micro spring causes erratic button response, finding the exact replacement becomes a frustrating hunt. Engineers, hobbyists, and repair technicians who work with compact mechanisms — from consumer electronics to precision instruments — need a reliable source of dimensionally accurate small compression springs in a range of wire gauges and free lengths.

These spring steel small compression springs are manufactured from carbon spring steel wire (with select stainless steel variants available), featuring wire diameters of 0.2 mm, 0.3 mm, and 0.4 mm (approximately 0.008–0.016 in). Outer diameters range from approximately 1.5 mm to 10 mm (0.06–0.39 in), and free lengths span 3 mm to 50 mm (0.12–1.97 in). Each pack contains 10 pieces of the selected size.

Typical use cases include spring-loaded button and switch assemblies in consumer electronics, tension-return mechanisms in robotics and automation fixtures, pen and stylus clip springs for writing instruments, and miniature valve or latch springs in medical devices and precision instruments — all scenarios where a small compression spring with consistent spring rate and tight dimensional tolerance is essential.

⚙️ Compatibility: Suitable for spring-loaded mechanisms requiring wire diameters of 0.2 mm, 0.3 mm, or 0.4 mm. Verify the outer diameter, free length, and wire gauge against your application before ordering. Stainless steel variants are noted in the size option name.

✅ Key Features of These Spring Steel Small Compression Springs

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Wide Size Matrix

Wire diameters of 0.2 mm, 0.3 mm, and 0.4 mm combined with free lengths from 3 mm to 50 mm give you a comprehensive selection to match exacting design requirements without custom tooling.

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Spring Steel Construction

Carbon spring steel provides consistent elastic modulus and fatigue resistance across repeated compression cycles, maintaining reliable return force in high-cycle applications.

⚗️

Stainless Steel Options Available

Select size variants are offered in stainless steel for environments where corrosion resistance is required — such as humid enclosures, medical devices, or outdoor instruments.

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10-Piece Pack

Each order ships as a pack of 10 identical springs, giving you spares for prototyping, repair batches, or small-batch production runs without overstocking.

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Tight Dimensional Consistency

Consistent wire diameter and coil geometry across the batch ensures predictable spring rate and interchangeability — critical when replacing springs in matched assemblies.

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Broad Application Range

From electronics button mechanisms and pen clips to robotics return springs and miniature valve assemblies, these micro compression springs cover a wide spectrum of light-duty precision applications.

📐 Technical Specifications — Small Compression Springs

Wire Diameter	0.2 mm / 0.3 mm / 0.4 mm (approx. 0.008–0.016 in)
Outer Diameter Range	Approx. 1.5 mm – 10 mm (0.06–0.39 in) — see variant options
Free Length Range	3 mm – 50 mm (0.12–1.97 in) — see variant options
Material	Carbon spring steel; stainless steel (selected variants)
Spring Type	Compression (open coil)
Coil Direction	See variant options
Surface Finish	See variant options
Spring Rate	See variant options
Pack Quantity	10 pieces per pack
End Type	See variant options

❓ Frequently Asked Questions

How do I choose the right size compression spring for my application?

Match three key dimensions: wire diameter (0.2, 0.3, or 0.4 mm), outer diameter (which must fit inside your housing bore with clearance), and free length (the uncompressed length, which should be longer than your required travel plus solid height). If you have the original spring, measure these with calipers before selecting a variant.

What is the difference between carbon spring steel and stainless steel variants?

Carbon spring steel offers excellent elastic properties and fatigue life for most indoor, dry applications. Stainless steel variants (noted in the size option name) provide corrosion resistance for humid, wet, or chemically exposed environments at a slightly higher material cost. For electronics and robotics in controlled environments, carbon spring steel is typically sufficient.

Are these springs strong enough for my mechanism?

These are micro compression springs designed for light-duty applications — button returns, pen clips, small latches, and similar low-load mechanisms. They are not intended for heavy industrial or high-load structural applications. If you need a specific spring rate (N/mm), contact us to confirm suitability before ordering.

Can I use these springs in outdoor or corrosive environments?

Standard carbon spring steel variants are not recommended for prolonged outdoor or high-humidity exposure without protective coating, as they may develop surface oxidation over time. For corrosive or humid environments, select a stainless steel variant where available in the size options.

How do I identify which size I need if I only have the housing dimensions?

Measure the inner diameter of the housing bore — the spring outer diameter should be approximately 0.1–0.3 mm smaller than the bore for a sliding fit. Then measure the available cavity depth for the free length, and estimate the required load to determine wire diameter. When in doubt, order a small assortment of sizes to test fit and spring rate in your assembly.

Do you offer custom lengths or wire diameters beyond what is listed?

The listed size matrix covers wire diameters of 0.2, 0.3, and 0.4 mm with free lengths from 3 mm to 50 mm. For sizes outside this range or custom spring specifications, please contact us to discuss your requirements.

What is the minimum order quantity?

Each variant is sold in packs of 10 pieces. This is the minimum order quantity per size. If you need larger quantities for production runs, contact us for bulk pricing options.

🛒 Select your wire diameter and free length above, then add to cart.