10pcs Wire Dia.0.3mm-0.6mm OD 2mm-10mm Small Springs Compression Spring Steel

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10pcs Wire Dia.0.3mm-0.6mm OD 2mm-10mm Small Springs Compression Spring Steel

HomeDIYer

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By HomeDIYer®

Wire Diameter: 0.3mm

Outer diameter: 2mm

Length & Quantity (pcs): 5mm & 10

Price:

$4.01 USD

Stock:

In stock (500 units), ready to be shipped

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Small Compression Springs — Precision Steel Coils for Tight-Space Applications

When a standard spring is simply too large for the job, makers, engineers, and hobbyists reach for small compression springs that fit where nothing else will. Whether you are repairing a pen mechanism, building a custom PCB fixture, or assembling a scale model, finding a spring with the exact wire diameter and outer diameter you need — without ordering a bulk reel — is a constant frustration. This listing solves that problem with a curated 10-piece pack of small compression springs in steel.

Each spring is wound from carbon steel wire with diameters ranging from 0.3 mm to 0.6 mm (approximately 0.012 in to 0.024 in). Outer diameters span 2 mm to 10 mm (approximately 0.08 in to 0.39 in), and free lengths range from 5 mm to 50 mm (approximately 0.20 in to 1.97 in) depending on the variant selected. The close-wound coil geometry provides consistent spring force across the compression stroke.

Typical use cases include small compression springs for electronics enclosures and battery contacts, miniature compression springs for RC car suspension and scale models, and precision coil springs for pen mechanisms, valve assemblies, and laboratory fixtures requiring repeatable return force.

⚙️ Compatibility: Suitable for general-purpose light-load applications. Select wire diameter and outer diameter to match your bore or shaft dimensions. Verify free length against your compressed and extended travel requirements before ordering.

✅ Key Features of These Small Compression Springs

🔩Wide Size Range — Wire diameters 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm; outer diameters 2 mm through 10 mm; free lengths 5 mm through 50 mm — all in one listing for easy mix-and-match selection.
🏗️Carbon Steel Construction — Wound from carbon steel wire for reliable spring-back force and consistent coil pitch across the full compression stroke.
📦10-Piece Pack — Each variant ships as a pack of 10 identical springs, giving you spares for prototyping, testing, and replacement without over-ordering.
📐Compact Form Factor — Miniature outer diameters starting at 2 mm make these springs suitable for tight bores, pen barrels, battery contacts, and other confined spaces.
⚖️Light-Load Rated — Thin wire diameters (0.3–0.6 mm) produce low spring rates appropriate for light return-force applications such as switches, latches, and sensor mechanisms.
🔄Versatile Application Fit — Used in electronics, RC models, scale assemblies, pen mechanisms, valve springs, and DIY workshop fixtures requiring a small, reliable coil spring.

📐 Technical Specifications — Small Compression Springs

Material	Carbon steel
Wire Diameter	0.3 mm / 0.4 mm / 0.5 mm / 0.6 mm (see variant options)
Outer Diameter (OD)	2 mm – 10 mm (see variant options)
Free Length	5 mm – 50 mm (see variant options)
Spring Type	Compression (close-wound coil)
Finish	See variant options
Quantity per Pack	10 pieces
Spring Rate	See variant options
End Type	See variant options

❓ Frequently Asked Questions

How do I choose the right wire diameter for my application?

Wire diameter determines the spring rate and load capacity. Thinner wire (0.3 mm) produces a softer, lower-force spring suitable for light-duty applications such as pen mechanisms or sensor contacts. Thicker wire (0.6 mm) provides a stiffer spring better suited for latches or light valve applications. Match the wire diameter to the force range your mechanism requires.

How do I select the correct outer diameter?

The outer diameter (OD) must be smaller than the bore or housing it sits inside, and larger than the shaft or pin it surrounds. As a general rule, allow 0.1–0.3 mm clearance between the spring OD and the bore ID to prevent binding during compression. This listing offers OD options from 2 mm to 10 mm to cover a wide range of bore sizes.

What free length should I choose?

Free length is the uncompressed length of the spring. Choose a free length that is longer than your required compressed length but short enough to fit within your assembly when unloaded. Available free lengths range from 5 mm to 50 mm in this listing. If you need a specific intermediate length, contact us to confirm availability.

Are these springs corrosion-resistant?

These springs are made from carbon steel, which offers good mechanical properties but limited corrosion resistance in humid or wet environments. For indoor, dry, or low-humidity applications they perform reliably. If your application involves moisture, consider applying a light coat of oil or selecting a stainless steel spring for your use case.

Can I use these springs in electronics or PCB assemblies?

Yes. The small outer diameters (starting at 2 mm) and short free lengths (starting at 5 mm) make these springs well-suited for battery contacts, PCB test fixtures, push-button mechanisms, and similar electronics applications. Verify that the spring rate and travel match your design requirements before finalising your selection.

How many springs are included per order?

Each variant includes 10 pieces of the same spring (same wire diameter, outer diameter, and free length). This gives you spares for prototyping and replacement. If you need larger quantities, please contact us to discuss bulk options.

Are these suitable for RC models or scale assemblies?

Yes. The miniature dimensions and light spring rates make these compression springs a popular choice for RC car suspension tuning, scale model mechanisms, and hobby assemblies where standard-size springs are too large. Select the OD and free length that match your model's suspension travel and housing dimensions.

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

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These o rings are a great for my ear tunnels

These o rings are a great for my ear tunnels, always loosing one here and there, I always have a new ones in the drawer. Being silicone, don't have any reactions compared to standard rubber ones I purchased at hardware stores, plus much less expensive. Purchased 16mm I'd to use on 19mm tunnels, and stay on great, might be able to get away with 17mm rings, but really happy with my choice.

Will never order from these folks again

I waited a long time and that’s all I received was the eyebolt with no threaded rod attached to it

Perfect they are really made well and I used them for my car

Perfect they are really made well and I used them for my car. The only thing I had a great for us. It took three weeks to get here. So shipping was slow.

did not include wing nuts

Hi Scott, thank you for your feedback. We're sorry for any inconvenience caused. Please get in touch with us directly, and we'll assist you. Thanks for shopping with HomeDIYer!

Haven't received the order yet! It's been over

Haven't received the order yet! It's been over 19 days!

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10pcs Wire Dia.0.3mm-0.6mm OD 2mm-10mm Small Springs Compression Spring Steel

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DIY Expert Support

Description

Small Compression Springs — Precision Steel Coils for Tight-Space Applications

✅ Key Features of These Small Compression Springs

📐 Technical Specifications — Small Compression Springs

❓ Frequently Asked Questions

10pcs Wire Dia.0.3mm-0.6mm OD 2mm-10mm Small Springs Compression Spring Steel

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