Spring Steel Compression Spring Pressure Coil Spring Wire 0.3mm OD 1.5-6mm Shop

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Spring Steel Compression Spring Pressure Coil Spring Wire 0.3mm OD 1.5-6mm Shop

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By HomeDIYer®

Size: 0.3mm X 1.5mm X 3mm

Quantitys: 10 PCS

Price:

$3.11 USD

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In stock (500 units), ready to be shipped

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Spring Steel Compression Springs — 0.3mm Wire, Precision Coil for DIY & Mechanical Assemblies

When a project demands consistent return force in a tight space, undersized or mismatched springs cause binding, premature fatigue, and failed assemblies. Engineers, robotics builders, and precision DIY enthusiasts need compression springs that hold exact tolerances across repeated cycles — and this range of 0.3mm wire diameter coil springs is built for exactly that.

Each spring is formed from spring steel wire with a nominal wire diameter of 0.3mm (approximately 0.012 in). Outer diameters span 1.5mm to 6mm (roughly 0.059 in to 0.236 in), and free lengths range from 3mm to 50mm (approximately 0.12 in to 1.97 in). Available in packs of 10 or 100 pieces to suit both prototyping and small-batch production runs.

Typical applications include miniature robotics actuators requiring compact return-force elements, precision instrument mechanisms such as pen tips and valve assemblies, and small-batch DIY electronics enclosures where a consistent spring-loaded contact is needed. Long-tail use cases include compression spring for 3D printer extruder, micro coil spring for RC car suspension, and small compression spring for electronics switch.

⚙️ Compatibility: Suitable for spring-loaded mechanisms requiring an outer diameter of 1.5–6mm and free length of 3–50mm. Verify bore/housing clearance before ordering. Select your size and quantity from the variant options above.

✅ Key Features of These Compression Coil Springs

🔩 0.3mm Spring Steel Wire

Consistent wire diameter across all variants ensures predictable spring rate and reliable elastic return in miniature mechanisms.

📐 Wide Size Matrix

OD from 1.5mm to 6mm and free lengths from 3mm to 50mm give you a broad selection to match your exact housing and travel requirements.

⚡ Spring Steel Construction

Spring steel offers strong elastic memory and resistance to permanent set under repeated compression cycles, extending service life in dynamic applications.

📦 10 or 100 PCS Pack Options

Choose a 10-piece pack for prototyping or a 100-piece pack for small-batch production — both options available for every size combination.

🎯 Precision-Wound Coils

Uniform coil pitch and closed ends provide stable seating on flat surfaces, reducing lateral deflection during compression.

🔄 Broad Application Range

Suited for robotics, precision instruments, electronics, RC models, and general mechanical assemblies where compact spring force is required.

📐 Technical Specifications — Compression Coil Springs

Wire Diameter	0.3mm (approx. 0.012 in)
Outer Diameter (OD)	1.5mm – 6mm (approx. 0.059 in – 0.236 in)
Free Length	3mm – 50mm (approx. 0.12 in – 1.97 in)
Material	Spring Steel
End Type	Closed ends (flat-ground finish not confirmed — See variant options)
Spring Rate	See variant options
Surface Finish	See variant options
Pack Quantity	10 PCS or 100 PCS (select above)
Coil Direction	Right-hand wound (typical; confirm for critical applications)

❓ Frequently Asked Questions

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

Measure the bore or housing inner diameter your spring must fit inside — the spring OD should be slightly smaller than the bore to allow free movement. Then measure the available travel distance and add your desired preload length to determine the free length you need. For example, if your housing bore is 4.5mm and you need 15mm of travel, select an OD of 4mm and a free length of 20–25mm to allow for preload.

What load capacity can a 0.3mm wire spring handle?

A 0.3mm wire diameter spring is designed for light-duty, miniature applications. Typical load capacity varies by OD and free length but generally falls in the range of a few grams to a few hundred grams of force at working deflection. For precise load requirements, contact us to confirm spring rate data for your selected size.

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 humid or wet environments, consider applying a light protective coating or selecting a stainless steel alternative. For dry indoor or enclosed applications, spring steel performs reliably over extended service life.

Are these compatible with 3D printer extruder mechanisms?

Yes — the smaller OD variants (1.5mm–3mm) and shorter free lengths (5mm–15mm) are commonly used in 3D printer extruder tensioner and filament guide assemblies. Verify the bore diameter of your extruder arm and the required spring travel before selecting a size. The 10 PCS pack is ideal for testing fitment before committing to a 100 PCS order.

Can I use these springs in RC car suspension or shock absorbers?

The larger OD variants (4mm–6mm) and longer free lengths (20mm–50mm) can be used in micro or nano-scale RC car suspension systems. Confirm the shock body inner diameter and required spring travel against the variant dimensions. For standard 1/10 scale RC cars, these springs are typically suited to micro or specialty builds rather than full-size shock assemblies.

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

Both pack options contain identical springs of the same size and specification. The 10 PCS pack is suited for prototyping, repair, or low-volume projects. The 100 PCS pack offers a lower per-unit cost and is intended for small-batch production, stocking spare parts, or projects requiring multiple spring placements. Select your preferred quantity from the Quantitys option above.

How do I verify the spring rate before purchasing?

Spring rate for each size is not listed individually in the product page due to the large variant matrix. If you require a specific spring rate (N/mm or lbf/in) for an engineering application, please contact us with your selected size (wire diameter, OD, free length) and we will provide the calculated or measured spring rate data before you order.

🛒 Select your size and quantity above, then add to cart.