Compression Spring Various Size 2-10mm Dia & 5-50mm Length - A2 Stainless Steel

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Compression Spring Various Size 2-10mm Dia & 5-50mm Length - A2 Stainless Steel

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By HomeDIYer®

Wire diameter x Outer diameter x Length (mm): 0.4mm x 2.0mm x 5mm

Amount (pieces): 10 pieces

Price:

$3.25 USD

Stock:

In stock (500 units), ready to be shipped

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Compression Spring 2–10mm OD — Precision A2 Stainless Steel for Tight-Space Applications

When a mechanism fails because a tiny spring loses tension or corrodes, the entire assembly stops working. Engineers, hobbyists, and repair technicians who work with miniature mechanisms, precision instruments, and small-batch prototypes need compression springs they can rely on across a wide size range without sourcing from multiple suppliers.

These compression springs are manufactured from A2 (304) stainless steel wire with diameters of 0.4 mm and 0.5 mm (approx. 0.016–0.020 in). Outer diameters span 2–10 mm (approx. 0.08–0.39 in) and free lengths range from 5–50 mm (approx. 0.20–1.97 in). Each listing is sold in a set of 10 pieces, allowing you to stock the exact size you need.

Typical use cases include replacement springs for pen mechanisms and retractable tools, return springs in miniature valves and solenoids for robotics and automation projects, and load-bearing springs in small-batch prototype assemblies where consistent spring rate and corrosion resistance are critical.

⚙️ Compatibility: Suitable for general mechanical assemblies, DIY electronics enclosures, robotics, precision instruments, and repair applications requiring miniature compression springs with OD 2–10 mm.

✅ Key Features of These A2 Stainless Steel Compression Springs

🔩A2 (304) Stainless Steel Wire — Inherent corrosion resistance makes these springs suitable for humid, mildly acidic, or outdoor-adjacent environments without surface coating.
📐Wide Size Matrix — Wire diameters 0.4 mm and 0.5 mm; outer diameters 2–10 mm; free lengths 5–50 mm. Select the exact combination from the variant selector above.
🎯Consistent Spring Rate — Uniform coil pitch and wire diameter across each batch ensures repeatable deflection behaviour for prototyping and production runs.
📦10-Piece Sets — Sold in packs of 10, giving you spares for testing, calibration, or replacement without over-ordering bulk quantities.
⚡Closed & Ground Ends — Flat-ground ends provide stable seating on spring pockets and plungers, reducing lateral buckling in confined bores.
🔄Broad Application Range — From pen clips and latch mechanisms to miniature pneumatic valves and sensor housings, these springs cover a wide spectrum of light-duty compression tasks.

📐 Technical Specifications — Compression Springs

Material	A2 (304) Stainless Steel
Wire Diameter	0.4 mm / 0.5 mm (approx. 0.016–0.020 in)
Outer Diameter Range	2–10 mm (approx. 0.08–0.39 in)
Free Length Range	5–50 mm (approx. 0.20–1.97 in)
End Type	Closed ends (ground finish typical for this wire range)
Coil Direction	Right-hand
Finish	Natural stainless (no additional coating)
Quantity per Pack	10 pieces
Spring Rate	See variant options
Load at Solid Height	See variant options

❓ Frequently Asked Questions

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

Measure the bore or housing that will contain the spring. The spring's outer diameter should be 0.1–0.3 mm smaller than the bore for a sliding fit. For free length, choose a spring whose free length is at least 20–30% longer than your required compressed length to keep stress within safe limits.

What is the difference between 0.4 mm and 0.5 mm wire diameter?

A thicker wire (0.5 mm) produces a stiffer spring with a higher spring rate and load capacity. A 0.4 mm wire spring is softer and deflects more under the same load. Choose 0.4 mm for very light-duty or delicate mechanisms and 0.5 mm where slightly more force is needed.

Are these springs suitable for outdoor or humid environments?

Yes. A2 (304) stainless steel offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. For marine or highly chlorinated environments, A4 (316) stainless would be a more appropriate choice.

Can I use these springs in food-contact or medical applications?

A2 stainless steel is widely used in food-processing equipment. However, for regulated medical or pharmaceutical applications, please verify material certifications with your compliance team before use, as specific traceability documentation may be required.

What does "closed end" mean and why does it matter?

Closed ends mean the last coil is wound tightly against the adjacent coil, creating a flat bearing surface. This allows the spring to sit squarely on a flat pocket or plunger without tilting, which is important for accurate force transmission in precision assemblies.

How many springs do I receive per order?

Each variant is sold as a pack of 10 pieces. If you need larger quantities, simply increase the order quantity at checkout.

Can these springs be used in compression-only or also in extension?

These are designed exclusively as compression springs — they resist being compressed along their axis. They are not suitable for extension (pulling) applications. For extension use, please look for extension spring listings.

🛒 Select your wire diameter, outer diameter, and length above, then add to cart.