Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small
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Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure SmallCompression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure SmallCompression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure SmallCompression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure SmallCompression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure SmallCompression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure SmallCompression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small

Compression Spring Various 0.4mm-0.5mm Diameter & 305mm Length Pressure Small

HomeDIYer
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By HomeDIYer®

Price:
$2.98 USD
Stock:
In stock (500 units), ready to be shipped

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Description

Compression Spring 0.4–0.5mm Wire Diameter — Precision Miniature Springs for Tight-Tolerance Applications

When your project demands a spring that fits where others won't, finding a reliable miniature compression spring in the exact wire diameter and free length can be a real challenge. Whether you're a maker repairing a precision instrument, an engineer prototyping a small mechanism, or a hobbyist building a custom device, having the right spring on hand saves hours of searching. These small compression springs are designed for exactly those situations — delivering consistent elastic force in an ultra-compact form factor.

Each spring is made from spring steel wire with a wire diameter of either 0.4mm (~0.016 in) or 0.5mm (~0.020 in), an outer diameter ranging from 3mm to 12mm (~0.12–0.47 in), and a free length spanning from 5mm to 305mm (~0.20–12.0 in). Springs are sold in packs of 10 pieces per variant, allowing you to stock up on the exact size you need.

Typical use cases include miniature compression springs for electronics enclosures, small compression springs for pen mechanisms and clickers, precision instrument springs for medical or optical devices, and replacement compression springs for hobby RC models and robotics assemblies. The wide size matrix makes it easy to find a compression spring for tight-tolerance DIY projects without custom fabrication.

⚙️ Compatibility: Suitable for general-purpose spring applications where wire diameter 0.4mm or 0.5mm, outer diameter 3–12mm, and free length 5–305mm are required. Verify spring rate and load requirements against your specific application before ordering.

✅ Key Features of These Miniature Compression Springs

  • 📐Wide Size Matrix — Wire diameters of 0.4mm and 0.5mm combined with outer diameters from 3mm to 12mm and free lengths from 5mm to 305mm give you precise control over spring selection.
  • 🔩Spring Steel Construction — Wound from spring steel wire for reliable elastic return force and resistance to permanent deformation under repeated compression cycles.
  • 📦10-Piece Packs — Each variant ships as a pack of 10 identical springs, giving you spares for prototyping, repair, or batch assembly without over-ordering.
  • 🎯Consistent Coil Geometry — Uniform pitch and closed ends (typical for this wire gauge range) ensure stable seating and predictable load-deflection behavior across the pack.
  • 🔬Miniature Form Factor — Ultra-fine wire diameters starting at 0.4mm make these springs suitable for compact mechanisms where standard springs are too large to fit.
  • 🛠️Versatile Application Range — From pen clickers and electronic contacts to instrument mechanisms and hobby robotics, these springs cover a broad range of light-duty precision applications.

📐 Technical Specifications — Miniature Compression Springs

Wire Diameter 0.4mm (~0.016 in) or 0.5mm (~0.020 in) — see variant options
Outer Diameter (OD) 3mm – 12mm (~0.12 – 0.47 in) — see variant options
Free Length 5mm – 305mm (~0.20 – 12.0 in) — see variant options
Material Spring steel
End Type See variant options
Spring Rate See variant options
Surface Finish See variant options
Quantity per Pack 10 pieces
Application Light-duty precision compression, miniature mechanisms

❓ Frequently Asked Questions

How do I read the size format shown in the variant options?

The size format follows the pattern Wire Diameter × Outer Diameter × Free Length (all in mm). For example, "0.4×5×20mm" means a wire diameter of 0.4mm, an outer diameter of 5mm, and a free length of 20mm. Select the combination that matches your application's bore diameter and required travel.

What is the difference between the 0.4mm and 0.5mm wire diameter options?

Wire diameter directly affects the spring's stiffness (spring rate) and load capacity. A 0.5mm wire diameter spring will generally be stiffer and carry a higher load than a 0.4mm wire spring of the same outer diameter and free length. Choose 0.4mm for very light-load applications and 0.5mm when you need slightly more resistance.

Are these springs corrosion resistant?

These springs are made from spring steel, which offers good mechanical properties but has limited inherent corrosion resistance compared to stainless steel. For applications in humid or wet environments, consider applying a light protective coating or contact us to confirm material suitability for your specific conditions.

What outer diameter should I choose to fit my housing bore?

As a general rule, select an outer diameter (OD) that is slightly smaller than your housing bore to allow free movement without binding. For example, if your bore is 5.5mm, a spring with a 5mm OD is typically a good starting point. Always verify clearance with your actual assembly dimensions before finalizing your order.

Can I use these springs in electronics or PCB assemblies?

Yes. The miniature wire diameters (0.4mm and 0.5mm) and small outer diameters (starting at 3mm) make these springs well-suited for use as contact springs, battery contacts, button mechanisms, and similar light-duty electronic applications. Ensure the spring's free length and compressed length fit within your PCB stack-up or enclosure depth.

How do I determine the right free length for my application?

The free length is the spring's uncompressed length. To select the correct free length, measure the available space in your assembly when the spring is at rest, then add the required travel (deflection) distance. The spring's compressed length must not exceed the solid height (all coils touching), so choose a free length that gives you adequate working travel within your housing depth.

Are these sold individually or in packs?

Each variant is sold as a pack of 10 identical springs. This gives you spares for prototyping, batch assembly, or repair without needing to order large quantities. The packing quantity is fixed at 10 pieces per order unit for all size variants.

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

 

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