0.5mm Wire Dia A2 Stainless Steel Compression Springs Return Spring Multi Sizes

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0.5mm Wire Dia A2 Stainless Steel Compression Springs Return Spring Multi Sizes

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Wire diameter x Outer diameter x Length: 0.5 x 3 x 5 mm

Amount (pieces): 10

Price:

$6.47 USD

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In stock (500 units), ready to be shipped

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0.5mm Wire Dia A2 Stainless Steel Compression Springs — Precision Return Force for Every Build

When a project demands reliable return force in a tight space, undersized or mismatched springs cause frustrating failures. Makers, electronics hobbyists, and precision assembly technicians who need a consistent, corrosion-resistant compression spring in the 0.5 mm wire diameter range will find this range covers virtually every common application without the need to source from multiple suppliers.

These compression springs are manufactured from A2 (304) stainless steel wire with a diameter of 0.5 mm (approx. 0.020 in). Outer diameters span 3–12 mm (approx. 0.12–0.47 in) and free lengths range from 5–100 mm (approx. 0.20–3.94 in), giving you a broad selection of spring rates and travel distances from a single product listing. Ends are typically closed and ground for flat seating.

Typical use cases include pen and stylus mechanisms requiring a light return spring, miniature valve and switch assemblies needing a small-diameter compression spring, and precision instrument or sensor housings where a stainless steel return spring resists moisture and mild chemicals without coating.

🔩 Compatibility: Suitable for spring-loaded mechanisms, PCB push-button assemblies, miniature valves, pen/stylus housings, and any application requiring a 0.5 mm wire diameter compression spring with OD 3–12 mm.

✅ Key Features of These 0.5mm Wire Stainless Steel Compression Springs

🦾A2 Stainless Steel Wire
Grade 304 stainless construction resists rust, oxidation, and mild corrosive environments — no additional coating required.

📐0.5 mm Wire Diameter
Consistent 0.5 mm wire gauge across all variants ensures predictable spring rate and deflection behaviour for precision designs.

🔢90+ Size Combinations
OD from 3 mm to 12 mm and free lengths from 5 mm to 100 mm — select the exact geometry your application demands.

⚖️Closed & Ground Ends
Flat-ground ends provide stable seating on both faces, reducing lateral buckling and improving load distribution in confined bores.

📦Multi-Pack Quantities
Available in packs of 5 or 10 pieces — stock up for prototyping runs or keep spares on hand for maintenance without over-ordering.

🔧Drop-In Replacement Ready
Standardised dimensions make these springs a direct drop-in replacement for common OEM compression springs in electronics and light mechanical assemblies.

📐 Technical Specifications — Compression Springs

Wire Diameter	0.5 mm (0.020 in)
Outer Diameter Range	3–12 mm (0.12–0.47 in)
Free Length Range	5–100 mm (0.20–3.94 in)
Material	A2 Stainless Steel (Grade 304)
End Type	Closed and ground (typical)
Spring Type	Compression / Return Spring
Coil Direction	See variant options
Surface Finish	Bright / natural stainless
Pack Quantity	5 or 10 pieces (select above)
Operating Temperature	Typically –20 °C to +200 °C (–4 °F to +392 °F)

❓ Frequently Asked Questions

How do I choose the right size compression spring for my project?

Match the outer diameter (OD) to your bore or housing ID, leaving a small clearance (typically 0.1–0.3 mm). Then select a free length that gives you the travel and preload you need. For light-duty return applications with a 0.5 mm wire, ODs of 3–6 mm suit pen mechanisms and PCB buttons, while ODs of 7–12 mm suit small valve seats and instrument housings.

What load can a 0.5 mm wire diameter compression spring handle?

A 0.5 mm wire spring is designed for light-duty applications. Typical spring rates range from approximately 0.05–0.5 N/mm depending on OD and free length. These springs are suited for return and preload forces in the range of 0.1–5 N. For heavier loads, a larger wire diameter is recommended.

Are these springs corrosion-resistant?

Yes. A2 (Grade 304) stainless steel provides good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is not recommended for prolonged immersion in chloride-rich environments (e.g. salt water) — for those applications, A4 (Grade 316) stainless would be more appropriate.

What is the difference between the 5-piece and 10-piece pack options?

Both packs contain identical springs. The 10-piece pack is priced at $6.47 and suits prototyping or small production runs where you need spares. The 5-piece pack at $6.30 is available for longer free-length variants (60–100 mm) where individual spring mass is higher. Select your preferred quantity in the Amount (pieces) option above.

Are these springs compatible with standard spring bores and plungers?

Yes. The standardised OD dimensions (3, 4, 5, 6, 7, 8, 9, 10, 12 mm) align with common metric bore sizes. Always verify your bore ID is at least 0.2 mm larger than the spring OD, and your guide pin/plunger OD is at least 0.2 mm smaller than the spring ID (ID = OD − 2 × wire diameter = OD − 1 mm).

How do I calculate the inner diameter (ID) of a specific variant?

Inner diameter = Outer diameter − (2 × wire diameter). For all variants in this listing: ID = OD − 1 mm. For example, a 0.5 × 6 × 20 mm spring has an ID of 5 mm (0.197 in). Use this to size your guide pin or plunger correctly.

Can I use these springs outdoors or in humid environments?

A2 stainless steel performs well in outdoor and humid conditions, including light rain exposure and condensation. For marine or coastal environments with salt spray, consider A4 stainless steel springs for longer service life.

🛒 Select your Wire diameter x Outer diameter x Length and Amount (pieces) 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

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0.5mm Wire Dia A2 Stainless Steel Compression Springs Return Spring Multi Sizes

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Description

0.5mm Wire Dia A2 Stainless Steel Compression Springs — Precision Return Force for Every Build

✅ Key Features of These 0.5mm Wire Stainless Steel Compression Springs

📐 Technical Specifications — Compression Springs

❓ Frequently Asked Questions

0.5mm Wire Dia A2 Stainless Steel Compression Springs Return Spring Multi Sizes

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