Compression Spring Wire Dia 0.4mm OD 7-8mm 304 Stainless Steel Vibration Damping

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Compression Spring Wire Dia 0.4mm OD 7-8mm 304 Stainless Steel Vibration Damping

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SIZE(CSxODxL): 0.4x7x5mm

QTY(pcs): 10Pcs

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$5.22 USD

Stock:

In stock (500 units), ready to be shipped

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Compression Spring 0.4mm Wire Dia — Corrosion-Resistant 304 Stainless Steel for Precision Applications

When a spring failure causes a device to malfunction mid-project, the culprit is often an undersized or corrosion-prone component. Engineers, hobbyists, and electronics repair technicians who work with compact mechanisms need compression springs that hold their rated load cycle after cycle without rusting or fatiguing. These 304 stainless steel compression springs deliver consistent return force in the tightest spaces.

Each spring is wound from 0.4 mm (0.016 in) wire diameter, with outer diameters of 7 mm (0.276 in) or 8 mm (0.315 in) and free lengths ranging from 5 mm to 50 mm (0.197 in – 1.969 in). The 304 stainless steel alloy provides solid corrosion resistance and maintains spring-back performance across a wide temperature range.

Typical use cases include vibration damping in PCB assemblies and sensor housings, return-force mechanisms in miniature switches and push-button fixtures, and load-bearing elements in precision instruments, pen mechanisms, and small appliance components — all scenarios where a compact compression spring with reliable fatigue life is essential.

⚙️ Compatibility: Suitable for spring seats or bores accepting OD 7 mm or 8 mm. Verify free length and spring rate against your application load requirements before ordering.

✅ Key Features of These Compression Springs

🔩304 Stainless Steel Construction
Resists oxidation and mild chemical exposure, making these compression springs suitable for humid environments and light industrial use.

📏Precise 0.4 mm Wire Diameter
Consistent wire gauge across the full range ensures predictable spring rate and deflection behavior for repeatable assembly results.

🔄Vibration Damping Performance
Tightly wound coils absorb and dissipate micro-vibrations in electronic enclosures, sensor mounts, and mechanical assemblies.

📦Flexible Quantity Options
Available in packs of 10 to 100 pieces — order the exact quantity you need for prototyping, repair, or small-batch production runs.

📐Wide Size Matrix
19 size combinations (OD 7 mm or 8 mm × lengths 5–50 mm) let you match the spring to your bore and stroke without custom fabrication.

⚡Consistent Coil Pitch
Uniform pitch throughout the coil body ensures even load distribution and prevents coil clash at maximum compression.

📐 Technical Specifications — Compression Springs

Material	304 Stainless Steel
Wire Diameter (CS)	0.4 mm (0.016 in)
Outer Diameter (OD)	7 mm (0.276 in) or 8 mm (0.315 in)
Free Length (L)	5 mm – 50 mm (0.197 in – 1.969 in)
Spring Type	Compression
End Type	See variant options
Spring Rate	See variant options
Surface Finish	Natural (uncoated stainless)
Quantity per Pack	10 / 20 / 30 / 40 / 50 / 60 / 70 / 80 / 90 / 100 pcs
Operating Temperature	Typically –20°C to +200°C (–4°F to +392°F)

❓ Frequently Asked Questions

How do I choose between the 7 mm and 8 mm outer diameter?

Measure the inner diameter of your spring seat or bore. The spring OD should be 0.2–0.5 mm smaller than the bore to allow free movement without binding. If your bore is approximately 7.5 mm, the 7 mm OD spring is the safer fit; for bores around 8.5 mm, choose the 8 mm OD variant.

What free length should I select for my application?

Start with a free length roughly 20–30% longer than your required compressed length. For example, if you need 10 mm of travel, a 13–15 mm free-length spring gives you working deflection without fully compressing the coils (solid height). Check the variant options for the length closest to your target.

Are these springs strong enough for load-bearing mechanisms?

At 0.4 mm wire diameter, these are light-duty springs suited for low-load applications such as switch returns, pen clips, sensor contacts, and vibration isolation in electronics. They are not designed for heavy mechanical loads. For higher load requirements, consider a larger wire diameter.

How corrosion-resistant is 304 stainless steel?

304 stainless steel offers solid resistance to atmospheric corrosion, fresh water, and mild acids. It is suitable for indoor humid environments and light outdoor exposure. For marine or chloride-rich environments, 316 stainless steel would be a more appropriate choice.

Can I use these springs in PCB or electronics assemblies?

Yes. The 304 stainless steel is non-magnetic (austenitic grade) and does not introduce significant magnetic interference. The small OD and short lengths make these springs well-suited for battery contacts, tactile switch returns, and vibration damping pads in compact electronic enclosures.

How do I decide how many pieces to order?

For prototyping or repair, a 10- or 20-piece pack is usually sufficient to test fit and function. For small-batch production runs, the 50- or 100-piece packs offer a lower per-unit cost. Order a slightly larger quantity than your immediate need to account for testing and attrition.

What is the difference between the SIZE format CSxODxL?

The size code follows the format CS × OD × L, where CS = wire (coil) diameter in mm, OD = outer diameter of the spring in mm, and L = free length in mm. For example, 0.4×7×20mm means a 0.4 mm wire, 7 mm outer diameter, 20 mm free-length spring.

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