Spring steel compression springs with diameter of 2-25mm and a length of 40mm.

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Spring steel compression springs with diameter of 2-25mm and a length of 40mm.

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Length(mm) & Wirediameter: 40 mm & 0.2 mm

Diameter: 2 mm

Material Selection & Qty (pcs): Stainless steel & 10pcs

Price:

$5.96 USD

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In stock (500 units), ready to be shipped

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40mm Compression Springs — Precise Load Control for Makers & Engineers

When a mechanism fails because a spring loses tension or collapses under load, the culprit is almost always an undersized or wrong-material coil. Hobbyists, prototype builders, and workshop technicians who need repeatable, consistent spring force in a compact 40 mm body will find this range covers the widest practical selection of wire diameters and coil diameters in one listing.

Each compression spring has a free length of 40 mm (approximately 1.57 in). Wire diameters span 0.2 mm to 1.4 mm (0.008–0.055 in) and coil outer diameters range from 2 mm to 25 mm (0.08–0.98 in). Available in 304 stainless steel, carbon spring steel, and zinc-plated spring steel to match your corrosion and load requirements.

Typical applications include 3D printer bed levelling mechanisms, RC car suspension assemblies, electronic push-button return mechanisms, jig and fixture clamping systems, and small pneumatic valve returns — all scenarios where a reliable 40mm compression spring with a specific wire-to-coil ratio is critical.

⚙️ Compatibility: Suitable for any application requiring a cylindrical compression spring with a free length of 40 mm. Match coil outer diameter to your bore or housing ID. Confirm wire diameter against your load and deflection requirements before ordering.

✅ Key Features of These 40mm Compression Springs

📏Wide Size Matrix — Wire diameters from 0.2 mm to 1.4 mm paired with coil diameters from 2 mm to 25 mm give you precise spring-rate control without custom tooling.
🔩Three Material Options — 304 stainless steel for corrosion resistance, carbon spring steel for higher load capacity, and zinc-plated spring steel for a cost-effective general-purpose choice.
📐Consistent Free Length — All springs in this listing share a 40 mm (1.57 in) free length, simplifying drop-in replacement across your designs.
🔄Closed & Ground Ends — Flat-ground ends ensure square seating against spring pockets and reduce lateral deflection under compression.
📦Convenient Pack Sizes — Stainless and spring steel variants ship in 10-piece packs; zinc-plated variants in 5-piece packs — ideal for prototyping and small-batch production.
🛡️Corrosion-Resistant Options — 304 stainless steel construction withstands moisture, mild chemicals, and outdoor exposure without surface treatment.

📐 Technical Specifications — Compression Spring

Free Length	40 mm (1.57 in)
Wire Diameter Range	0.2 mm – 1.4 mm (0.008–0.055 in)
Coil Outer Diameter Range	2 mm – 25 mm (0.08–0.98 in)
Material Options	304 Stainless Steel / Carbon Spring Steel / Zinc-Plated Spring Steel
End Type	Closed & Ground
Spring Type	Cylindrical Compression
Pack Quantity	5 pcs (Zinc) / 10 pcs (Stainless & Spring Steel)
Spring Rate	See variant options
Max Load	See variant options
Surface Finish	Natural (Stainless & Spring Steel) / Zinc-plated

❓ Frequently Asked Questions

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

Start with the coil outer diameter: it must fit inside your bore or housing with a small clearance (typically 0.5–1 mm). Then select the wire diameter based on the load you need to support — thicker wire means a stiffer spring and higher load capacity. If you are unsure, select your size above and contact us with your load and deflection requirements for guidance.

What is the difference between stainless steel and spring steel for compression springs?

304 stainless steel offers excellent corrosion resistance and is suitable for wet, outdoor, or mildly chemical environments. Carbon spring steel (uncoated) provides higher tensile strength and is preferred where maximum load capacity matters and moisture exposure is limited. Zinc-plated spring steel sits between the two — it adds a basic corrosion barrier at a lower cost than stainless.

Will these springs rust or corrode over time?

The 304 stainless steel variants are highly resistant to rust and mild corrosion. Carbon spring steel variants are not inherently rust-resistant and should be used in dry or protected environments, or coated after installation. Zinc-plated variants offer moderate corrosion protection suitable for indoor or lightly humid conditions.

Are these compression springs compatible with standard spring pockets and plungers?

Yes — the closed and ground ends allow these springs to seat flat in standard spring pockets, plunger housings, and guide rods. Verify that the coil outer diameter you select is at least 0.5 mm smaller than your housing bore, and that the guide rod (if used) is at least 0.5 mm smaller than the coil inner diameter.

Can I use these springs in a 3D printer, RC vehicle, or electronics project?

Absolutely. The fine wire diameter options (0.2–0.5 mm) are well-suited for 3D printer bed levelling, small electronic push-button returns, and RC suspension tuning. Heavier wire diameters (0.8–1.4 mm) are better for mechanical jigs, fixtures, and valve return applications where higher spring force is needed.

How many pieces are included per order?

Stainless steel and spring steel variants are sold in packs of 10 pieces. Zinc-plated variants are sold in packs of 5 pieces. The pack size is shown in the "Material Selection & Qty" option when you select your variant above.

What should I check before purchasing to make sure I get the right spring?

Confirm three things: (1) the free length — all springs here are 40 mm; (2) the coil outer diameter — must fit your housing bore; (3) the wire diameter — determines spring rate and load capacity. If you need a specific spring rate or load value, contact us to confirm before ordering.

🛒 Select your Length, Diameter, and Material 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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Spring steel compression springs with diameter of 2-25mm and a length of 40mm.

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Description

40mm Compression Springs — Precise Load Control for Makers & Engineers

✅ Key Features of These 40mm Compression Springs

📐 Technical Specifications — Compression Spring

❓ Frequently Asked Questions

Spring steel compression springs with diameter of 2-25mm and a length of 40mm.

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