Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY
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Spring Steel Compression Spring Pressure Coil Spring 0.4mm Wire OD 3-10mm DIY

HomeDIYer
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By HomeDIYer®

Price:
$8.64 USD
Stock:
In stock (500 units), ready to be shipped

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Description

Compression Spring 0.4mm Wire — Reliable Coil Springs for DIY Precision Assemblies

When a mechanism fails because a tiny spring loses tension or collapses under load, the whole project stalls. Hobbyists, makers, and small-workshop engineers who build precision devices, electronic enclosures, or mechanical fixtures need compression springs they can count on — springs that hold their rated force across hundreds of cycles without set or fatigue. These spring steel compression springs are engineered for exactly that kind of demanding, detail-oriented work.

Each spring is wound from 0.4 mm spring steel wire with an outer diameter (OD) ranging from 3 mm to 10 mm (approximately 0.12 in to 0.39 in) and a free length ranging from 5 mm to 50 mm (approximately 0.20 in to 1.97 in). The close-wound coil geometry and consistent pitch deliver predictable linear deflection across the full compression range. Available in packs of 10 or 100 pieces to suit both prototyping and production runs.

Typical use cases include spring-loaded button mechanisms in consumer electronics, return-force elements in 3D-printer extruder assemblies, and preload components in small pneumatic or hydraulic valve bodies — all scenarios where a compact, consistent compression spring for DIY projects is essential.

⚙️ Compatibility: Suitable for spring-loaded mechanisms, electronic enclosures, 3D-printer components, model engineering, and general DIY assemblies requiring OD 3–10 mm compression springs with 0.4 mm wire diameter.

✅ Key Features of These Compression Springs

🔩 0.4 mm Spring Steel Wire

Consistent wire diameter across all variants ensures predictable spring rate and reliable force output in compact mechanisms.

📐 Wide Size Range — OD 3 mm to 10 mm

Eight outer diameter options (3, 4, 5, 6, 7, 8, 9, 10 mm) paired with free lengths from 5 mm to 50 mm give you precise fit for nearly any housing bore.

🔄 Linear Deflection Characteristic

Close-wound coil geometry and uniform pitch deliver a consistent spring rate throughout the compression stroke — no sudden stiffness spikes.

🛡️ Spring Steel Construction

Spring steel provides the elasticity and fatigue resistance needed for repeated cycling in buttons, latches, valves, and return mechanisms.

📦 10 PCS or 100 PCS Pack Options

Order a 10-piece pack for prototyping or a 100-piece bulk pack for production runs — both options available for every size combination.

🎯 Compact Form Factor

Miniature dimensions (OD as small as 3 mm / 0.12 in) make these springs ideal for tight-clearance assemblies in electronics, instruments, and precision fixtures.

📐 Technical Specifications — Compression Springs

Wire Diameter 0.4 mm (0.016 in)
Outer Diameter (OD) 3 mm – 10 mm (0.12 in – 0.39 in)
Free Length 5 mm – 50 mm (0.20 in – 1.97 in)
Material Spring Steel
Coil Type Compression (close-wound)
Spring Rate See variant options
Surface Finish See variant options
End Type See variant options
Pack Quantity 10 PCS / 100 PCS
Application DIY mechanisms, electronics, 3D printing, model engineering, precision fixtures

❓ Frequently Asked Questions

How do I choose the right OD and length for my application?

Measure the bore or housing diameter where the spring will sit — the spring OD should be slightly smaller than the bore for a sliding fit, typically 0.1–0.3 mm clearance. For free length, choose a spring that is longer than your required compressed length so it still exerts force at full compression. Use the Size selector above to browse all available OD × length combinations.

What is the spring rate (stiffness) of these compression springs?

Spring rate depends on the specific OD and free length combination selected. Shorter springs with smaller OD tend to be stiffer; longer springs with larger OD are softer. Exact spring rate values vary by variant — please contact us to confirm the rate for your chosen size if your application requires a specific force value.

Are these springs corrosion-resistant?

These springs are made from spring steel, which offers good mechanical properties but has moderate corrosion resistance. For indoor, dry, or low-humidity environments they perform reliably. For outdoor or high-moisture applications, consider applying a light coat of oil or using them in a protected housing. If you need stainless steel variants, please contact us.

Are these compatible with 3D-printer extruder or bed-leveling assemblies?

Yes. The 3 mm and 4 mm OD variants with lengths of 10–20 mm are commonly used in extruder spring-loaded mechanisms and bed-leveling assemblies on FDM printers. Verify the bore diameter and required preload force against your printer's specification before ordering.

Can I use these springs in electronic button or switch mechanisms?

Absolutely. The small OD range (3–6 mm) and short free lengths (5–15 mm) make these springs well-suited for tactile button return mechanisms, keyboard switch assemblies, and spring-loaded contact elements in electronic enclosures. Select the OD that fits your button housing bore.

What is the difference between the 10 PCS and 100 PCS options?

Both packs contain identical springs of the same size. The 10 PCS pack is ideal for prototyping, testing, or small repairs. The 100 PCS bulk pack offers a lower per-unit cost and is suited for production runs, stocking a workshop, or projects requiring many identical springs. Select your preferred quantity using the Quantitys option above.

How do I verify the spring will fit my housing before ordering?

Check three dimensions: (1) the housing bore inner diameter — the spring OD should be 0.1–0.3 mm smaller; (2) the guide pin outer diameter if present — the spring inner diameter (ID ≈ OD − 2 × wire diameter, so ID ≈ OD − 0.8 mm) should be larger than the pin; (3) the available cavity depth — the spring free length should not exceed the cavity depth. If in doubt, order a 10 PCS sample first.

🛒 Select your Size (OD × Length) and Quantity above, then add to cart.

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