A2 Stainless Small Compression Spring 0.4/0.5/0.6mm Wire Pressure Coil Spring

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A2 Stainless Small Compression Spring 0.4/0.5/0.6mm Wire Pressure Coil Spring

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By HomeDIYer®

Size: 0.4 x 2.0 x 5mm

Pack of Quantity (Pcs): 10

Price:

$9.04 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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A2 Stainless Steel Compression Springs — Reliable Elastic Force for Precision Applications

When a project demands consistent return force in a compact footprint, undersized or mismatched springs cause frustrating failures — loose assemblies, inconsistent travel, and premature fatigue. Engineers, robotics builders, and hands-on makers who need dependable small compression springs will find this range purpose-built for tight tolerances and long service life.

These A2 stainless steel compression springs are wound from round wire with diameters of 0.4 mm, 0.5 mm, and 0.6 mm (approximately 0.016–0.024 in). Outer diameters span roughly 2.0–12.0 mm (≈0.08–0.47 in), and free lengths range from approximately 3.5–50 mm (≈0.14–1.97 in). Each pack contains 10 pieces of a single specified size, sold by wire diameter × outer diameter × free length.

Typical use cases include small compression springs for electronics enclosures and switch mechanisms, pressure coil springs for robotics actuators and gripper assemblies, and miniature return springs for precision instruments, pen mechanisms, and valve assemblies where corrosion resistance is critical.

⚙️ Compatibility: Suitable for spring-loaded mechanisms requiring wire diameters of 0.4 mm, 0.5 mm, or 0.6 mm. Verify the outer diameter and free length against your housing bore and travel requirements before ordering.

✅ Key Features of These A2 Stainless Compression Springs

🔩 A2 Stainless Steel Construction

Grade A2 (304-equivalent) stainless steel wire provides solid corrosion resistance in humid, mildly acidic, and outdoor environments without surface coatings that can flake or wear.

📐 Wide Size Matrix

Three wire diameters (0.4 / 0.5 / 0.6 mm) combined with outer diameters from 2.0 to 12.0 mm and free lengths from 3.5 to 50 mm give you precise size matching across hundreds of combinations.

🔄 Consistent Spring Rate

Close-coil winding geometry maintains uniform pitch and coil spacing, delivering repeatable deflection and load characteristics across the full compression stroke.

🧲 Closed & Ground Ends (typical)

End coils are typically closed to provide flat, stable seating surfaces that reduce lateral buckling and allow accurate load transfer in confined bores.

📦 10-Piece Pack Quantity

Each listing ships 10 identical springs of the selected size — enough for prototyping, small-batch production, or stocking spares without over-ordering bulk quantities.

🛠️ Broad Application Compatibility

Sized for electronics, robotics, instrumentation, pen mechanisms, valve assemblies, and general DIY projects where miniature return or compression force is required.

📐 Technical Specifications — Compression Spring

Material	A2 Stainless Steel (304-equivalent)
Wire Diameter	0.4 mm / 0.5 mm / 0.6 mm (≈ 0.016–0.024 in)
Outer Diameter Range	2.0–12.0 mm (≈ 0.08–0.47 in)
Free Length Range	3.5–50 mm (≈ 0.14–1.97 in)
Spring Type	Compression (helical coil)
End Type	See variant options
Surface Finish	Natural stainless (no coating)
Spring Rate	See variant options
Pack Quantity	10 pieces per pack
Variant Selection	Wire Diameter × Outer Diameter × Free Length

❓ Frequently Asked Questions

How do I choose the right size compression spring?

Match three dimensions to your application: wire diameter (0.4, 0.5, or 0.6 mm), outer diameter (must fit inside your housing bore with clearance), and free length (must exceed your required travel plus solid height). Select your size from the variant dropdown using the format Wire Diameter × Outer Diameter × Free Length.

What is the load capacity of these springs?

Load capacity depends on wire diameter, outer diameter, free length, and number of active coils — all of which vary by size. These are light-duty miniature springs suited for small mechanisms, switches, and instrumentation. For specific load or spring-rate data for your chosen size, please contact us to confirm.

Are these springs corrosion-resistant?

Yes. A2 stainless steel (304-equivalent) offers solid resistance to moisture, humidity, and mild chemical exposure without requiring additional coatings. They are suitable for outdoor, marine-adjacent, and light industrial environments. For highly acidic or chloride-heavy environments, A4 (316) stainless would be a stronger choice.

Can I use these springs in electronics or PCB assemblies?

Yes. The small wire diameters (0.4–0.6 mm) and compact outer diameters (as small as 2.0 mm) make these springs well-suited for battery contacts, tactile switch returns, connector latches, and other PCB-level spring mechanisms where space is limited.

What is the difference between the 0.4, 0.5, and 0.6 mm wire diameter options?

Wire diameter directly affects stiffness: a thicker wire produces a stiffer spring with higher load capacity for the same outer diameter and length. Choose 0.4 mm for the lightest touch force, 0.5 mm for moderate return force, and 0.6 mm for the firmest response in this range. All three are available across a wide matrix of outer diameters and free lengths.

Are these springs compatible with robotics and automation projects?

Yes. These miniature compression springs are commonly used in robotic gripper fingers, actuator return mechanisms, sensor mounts, and small servo linkages. The stainless construction handles repeated cycling without rust, and the wide size range lets you match spring geometry to your specific bore and travel requirements.

Do you offer bulk quantities beyond the 10-piece pack?

The standard listing ships 10 pieces per pack. If you need larger quantities for production or stocking purposes, please contact us directly to discuss bulk pricing and availability for your specific size.

🛒 Select your Wire Diameter × Outer Diameter × Free Length above, then add to cart.