0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs
0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs
0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs
0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs
0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs
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0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs

0.3mm Wire Diameter Compression Spring 2mm-4mm OD Small Pressure Springs

HomeDIYer
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By HomeDIYer®

Price:
$7.97 USD
Stock:
In stock (500 units), ready to be shipped

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Description

0.3mm Wire Diameter Compression Springs — Precision Fit for Tight Spaces

When your project demands a spring that fits where nothing else will, finding a reliable 0.3mm wire diameter compression spring in the exact outer diameter and length you need can be a real challenge. Whether you are a maker repairing a precision instrument, an engineer prototyping a miniature mechanism, or a hobbyist building a custom gadget, undersized springs that slip out of spec or collapse under load waste time and money.

These compression springs feature a 0.3mm wire diameter and are available in outer diameters of 2mm, 2.5mm, 3mm, and 4mm (approximately 0.079–0.157 in), with free lengths ranging from 5mm to 50mm (approximately 0.20–1.97 in). Each spring is wound from spring steel wire and finished with a consistent closed-end coil profile to ensure stable seating and repeatable load characteristics across the full size range.

Typical use cases include electronic device button mechanisms requiring a small return-force spring, miniature valve assemblies in fluid control systems, pen and stylus click mechanisms needing a compact compression element, and precision instrument calibration fixtures where a low-force small-OD spring is essential for consistent actuation.

⚙️ Compatibility: Suitable for spring seats, bores, and housings designed for 2mm–4mm OD compression springs. Verify bore diameter and free-length clearance before ordering. Select your size from the variant options above.

✅ Key Features of These 0.3mm Wire Diameter Compression Springs

🔩 Consistent 0.3mm Wire Diameter

Uniform wire cross-section across all size variants ensures predictable spring rate and reliable load performance in tight-tolerance assemblies.

📐 Wide Size Range in One Listing

OD options of 2mm, 2.5mm, 3mm, and 4mm combined with free lengths from 5mm to 50mm give you the flexibility to match your exact application without sourcing from multiple suppliers.

🛡️ Closed-End Coil Construction

Closed and ground-style ends provide a flat seating surface that reduces lateral buckling and keeps the spring centered in its housing during compression cycles.

⚡ Spring Steel Material

Wound from spring steel wire that offers a balance of elasticity and fatigue resistance suitable for repeated compression cycles in mechanical and electronic applications.

📦 Flexible Pack Quantities

Available in packs of 10, 20, 30, or 50 pieces so you can order exactly what your project requires — from a single prototype run to a small production batch.

🔬 Miniature Scale for Precision Work

The 0.3mm wire diameter and sub-5mm OD options make these springs well-suited for electronics repair, pen mechanisms, miniature valves, and other applications where space is at a premium.

📐 Technical Specifications — Compression Springs

Wire Diameter 0.3 mm (0.012 in)
Outer Diameter (OD) 2 mm / 2.5 mm / 3 mm / 4 mm — See variant options
Free Length 5 mm – 50 mm (0.20 in – 1.97 in) — See variant options
Spring Type Compression (closed ends)
Material Spring Steel
Finish See variant options
Spring Rate See variant options
Max Load Capacity See variant options
Pack Quantity 10 / 20 / 30 / 50 pcs — See variant options
Application Electronics, precision instruments, miniature mechanisms, DIY assemblies

❓ Frequently Asked Questions

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

Measure the bore or housing your spring will sit in and select an OD that is slightly smaller than the bore diameter to allow free movement. For free length, choose a spring that is longer than your required compressed height so it maintains positive force at full compression. Use the variant selector above to pick your OD (2mm, 2.5mm, 3mm, or 4mm) and length (5mm–50mm).

What load can a 0.3mm wire diameter compression spring handle?

At 0.3mm wire diameter, these are light-duty springs designed for low-force applications such as button return mechanisms, pen clicks, and miniature valve actuation. Exact load capacity varies by OD and free length — shorter springs with larger OD will generally have a higher spring rate. Contact us to confirm load specifications for your specific variant.

Are these springs corrosion resistant?

These springs are made from spring steel wire. Spring steel offers good mechanical properties for dry or low-humidity indoor environments. For applications exposed to moisture, chemicals, or outdoor conditions, consider using stainless steel springs instead, as standard spring steel may develop surface oxidation over time without a protective coating.

Will these springs fit standard spring seats and housings?

These springs are designed to fit housings and bores sized for 2mm–4mm OD compression springs. Always verify the inner diameter of your housing is at least 0.1–0.2mm larger than the spring OD to allow free travel. The closed-end coil profile provides a flat seating surface compatible with most standard spring seats.

Can I use these springs in electronic devices or PCB assemblies?

Yes. The miniature scale of these springs — particularly the 2mm and 2.5mm OD variants — makes them well-suited for button return mechanisms, battery contacts, stylus tips, and other low-force electronic assembly applications. Ensure the spring material is compatible with any conductive or insulating requirements of your specific design.

How many springs do I need to order, and what pack sizes are available?

Pack sizes of 10, 20, 30, and 50 pieces are available for each size combination. For prototyping or repair work, a pack of 10 is usually sufficient. For small production runs or to keep spares on hand, packs of 30 or 50 offer better per-unit value. Select your preferred quantity from the Quantity(Pcs) option above.

What is the difference between the 2mm, 2.5mm, 3mm, and 4mm OD variants?

All variants share the same 0.3mm wire diameter, so the key difference is the outer diameter and the resulting spring rate. A larger OD with the same wire diameter and length will generally produce a slightly stiffer spring. Choose the OD that matches your housing bore and the stiffness your application requires. If you are unsure, start with the 3mm OD as a mid-range option.

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

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