Compression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mm
Compression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mm
Compression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mm
Compression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mm
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Compression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mmCompression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mmCompression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mmCompression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mm

Compression Spring Wire Pressure Small 0.3/0.4mmX6mmX15mm

HomeDIYer
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By HomeDIYer®

Price:
$3.37 USD
Stock:
In stock (500 units), ready to be shipped

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Description

Compression Springs for Precision DIY Mechanisms — 0.3/0.4mm Wire, 6mm OD, 15mm Length

When a loose fit, inconsistent return force, or rattling component is ruining your build, the culprit is almost always an undersized or mismatched spring. Makers, electronics hobbyists, and small-appliance repair technicians who work with compact mechanisms need springs that deliver repeatable, controlled compression in tight spaces — without deforming under repeated cycling.

These small compression springs are wound from hardened steel wire in two wire diameter options — 0.3mm and 0.4mm — with a consistent 6mm outer diameter (approx. 0.24 in) and a free length of 15mm (approx. 0.59 in). Each pack contains 10 pieces, giving you spares for prototyping and replacements in one order.

Typical use cases include spring-loaded button mechanisms in consumer electronics, pen and stylus clip assemblies, miniature valve return springs in pneumatic or fluid systems, and precision jig fixtures in maker workshops. Long-tail applications include "small OD compression spring for PCB switch", "0.3mm wire micro spring for pen mechanism", and "replacement compression spring for small appliance".

⚙️ Compatibility: Suitable for spring seats or bores with an inner diameter of approximately 6mm or larger. Verify free length (15mm) and wire diameter (0.3mm or 0.4mm) against your application before ordering.

✅ Key Features of These Compression Springs

🔩 Two Wire Diameter Options

Choose 0.3mm for lighter return force or 0.4mm for firmer resistance — both wound to the same 6mm OD for drop-in interchangeability when tuning spring rate.

📏 Compact 6mm OD × 15mm Free Length

Designed for confined spaces where standard springs are too large. The 6mm outer diameter (≈0.24 in) and 15mm free length (≈0.59 in) fit a wide range of miniature mechanisms.

🔄 Consistent Coil Geometry

Uniform pitch and closed ends ensure stable seating on flat spring plates or inside cylindrical bores, reducing lateral buckling during compression cycles.

🛡️ Hardened Steel Wire Construction

Wound from hardened steel wire that resists permanent set under repeated loading, maintaining spring rate over extended service life in mechanical assemblies.

📦 10-Piece Pack — Ready for Prototyping

Each order includes 10 springs, giving you enough units to prototype, test spring rate variations, and keep replacements on hand without reordering.

🔧 Broad DIY & Repair Applications

Used in pen clips, push-button switches, miniature valves, sensor housings, and precision jig fixtures — wherever a reliable, repeatable return force is needed in a small footprint.

📐 Technical Specifications — Compression Spring

Wire Diameter 0.3mm / 0.4mm (see variant options)
Outer Diameter (OD) 6mm (approx. 0.24 in)
Free Length 15mm (approx. 0.59 in)
Spring Type Compression (closed ends)
Material Hardened steel wire
Surface Finish See variant options
Spring Rate See variant options
Quantity per Pack 10 pieces
Weight (per pack) Approx. 5g

❓ Frequently Asked Questions

How do I choose between the 0.3mm and 0.4mm wire diameter?

Wire diameter directly affects spring rate (stiffness). The 0.3mm wire produces a lighter return force, suitable for low-load applications like pen clips or lightweight push buttons. The 0.4mm wire delivers a firmer resistance, better suited for mechanisms that need a more positive return, such as small valve springs or switch plungers. If you are unsure, order both variants to test in your application.

What inner diameter bore or spring seat do these springs fit?

The outer diameter is 6mm, so the spring fits inside a bore of approximately 6.2mm or larger. For a guided post, the inner diameter of the spring (OD minus 2× wire diameter) is approximately 5.4mm (0.3mm wire) or 5.2mm (0.4mm wire), meaning the guide post should be slightly smaller than these values to allow free movement.

Are these springs corrosion-resistant?

These springs are wound from hardened steel wire. For indoor, dry environments they perform reliably over extended use. If your application involves moisture, humidity, or mild chemical exposure, consider applying a light coat of machine oil or contact us to confirm whether a coated variant is available for your use case.

Can I use these springs in electronic or PCB assemblies?

Yes. The compact 6mm OD and 15mm free length make these springs well-suited for spring-loaded contacts, push-button switches on PCBs, and battery terminal springs in small consumer electronics. Verify the compressed length against your PCB stack height before finalizing your design.

How many springs are included, and can I order larger quantities?

Each pack contains 10 pieces. If you need larger quantities for production runs or bulk prototyping, please use the quantity selector at checkout or contact us directly to discuss bulk pricing options.

What is the compressed (solid) length of these springs?

Solid length is calculated as wire diameter × number of coils. The exact coil count is not specified for all variants — please contact us to confirm solid length if your application has a strict minimum compressed-length requirement. As a conservative estimate, solid length is typically 30–50% of the free length for springs in this size range.

Are these suitable for replacement in small appliances or tools?

These springs are a strong match for replacement applications in pens, mechanical pencils, small hand tools, clamps, and light-duty appliances where the original spring has a similar OD (6mm) and free length (15mm). Always measure the original spring's wire diameter and free length before ordering to confirm compatibility.

🛒 Select your Wire Diameter and Length & Quantity above, then add to cart.

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