Compression Spring Wire Dia 0.3mm Pressure Small Stainless steel Micro Miniature

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Compression Spring Wire Dia 0.3mm Pressure Small Stainless steel Micro Miniature

Name: Compression Spring Wire Dia 0.3mm Pressure Small Stainless steel Micro Miniature
Brand: HomeDIYer
Price: 3.1 USD
Availability: InStock

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By HomeDIYer®

Wire Diameter(mm): 0.3

Outer Diameter(mm): 2

Length(mm) & Quantitys: 5 & 10pcs

Price:

$3.10 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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Micro Compression Springs — Precision 0.3mm Wire Diameter for Tight-Tolerance Applications

When your project demands reliable spring force in an extremely confined space, standard springs simply won't fit. Engineers, robotics builders, and electronics hobbyists working on miniature mechanisms know the frustration of sourcing springs small enough to function without compromising performance. These micro compression springs are wound from 0.3mm stainless steel wire and are engineered specifically for tight-tolerance assemblies where every fraction of a millimeter counts.

Each spring is formed from 0.3mm (approx. 0.012 in) stainless steel wire. Outer diameters span 2–7mm (approx. 0.079–0.276 in), and free lengths range from 5mm to 305mm (approx. 0.197–12.0 in), giving you a broad selection to match your exact dimensional requirements. Springs are sold in packs of 1 to 40 pieces depending on the variant selected.

Typical use cases include micro compression springs for electronics enclosures and PCB assemblies, miniature spring mechanisms in robotics and automation projects, and small-scale DIY devices such as pen mechanisms, tactile switches, and precision instruments requiring consistent return force.

⚙️ Compatibility: Suitable for spring seats, bores, and housings with inner diameters matching the selected outer diameter. Verify free length and spring rate against your load requirements before ordering.

✅ Key Features of These Micro Compression Springs

🔩0.3mm Wire Diameter — Ultra-fine wire gauge enables use in the smallest spring pockets and precision mechanisms where larger wire would not fit.
🛡️Stainless Steel Construction — Corrosion-resistant alloy maintains spring properties in humid, mildly corrosive, or outdoor environments without surface treatment.
📐Wide Size Range — Outer diameters from 2mm to 7mm and free lengths from 5mm to 305mm cover a broad spectrum of miniature spring applications in a single listing.
📦Flexible Pack Quantities — Available in packs of 1, 3, 5, 9, 10, 20, or 40 pieces so you can order exactly what your project requires without excess waste.
⚡Consistent Spring Force — Uniform coil pitch and wire diameter across each batch ensures repeatable deflection behavior, critical for precision assemblies and automated mechanisms.
🔬Miniature Micro Form Factor — Designed for applications where space is at a premium: tactile switches, pen mechanisms, medical devices, and micro robotics actuators.

📐 Technical Specifications — Micro Compression Springs

Wire Diameter	0.3 mm (approx. 0.012 in)
Outer Diameter (OD)	2 mm / 3 mm / 4 mm / 5 mm / 6 mm / 7 mm — See variant options
Free Length	5 mm – 305 mm — See variant options
Material	Stainless Steel
Spring Type	Compression (open-coil, helical)
End Type	Open ends (typically ground or plain — See variant options)
Coil Direction	Right-hand wound (standard)
Spring Rate	See variant options
Pack Quantity	1 / 3 / 5 / 9 / 10 / 20 / 40 pcs — See variant options
Surface Finish	Natural stainless (no coating)

❓ Frequently Asked Questions

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

Measure the bore or housing your spring will sit in and select an outer diameter (OD) slightly smaller than that bore to allow free movement. For free length, choose a spring longer than your required compressed length so it still exerts force at full compression. Use the variant selector above to browse available OD and length combinations.

What is the spring rate of these 0.3mm wire compression springs?

Spring rate varies by outer diameter and free length — shorter springs with smaller OD are stiffer, while longer springs with larger OD are softer. Exact spring rate data is not listed per variant; if you need a specific rate for a load-critical application, contact us to confirm before ordering.

Are these springs corrosion-resistant?

Yes. These springs are made from stainless steel, which provides good resistance to rust and mild corrosion in humid or outdoor environments. They are suitable for applications exposed to moisture, light chemicals, or temperature cycling. For highly aggressive chemical environments, please verify material compatibility with your specific conditions.

Can I use these springs in electronics or PCB assemblies?

Yes. The 0.3mm wire diameter and small outer diameters (starting at 2mm) make these springs well-suited for use in tactile switches, battery contacts, connector mechanisms, and other PCB-level spring applications. Stainless steel is non-magnetic in most grades, which is beneficial in sensitive electronic environments.

What is the difference between the 10pcs, 20pcs, and 40pcs pack options?

The pack quantity determines how many individual springs you receive per order. Larger packs offer a lower per-unit cost and are ideal for prototyping batches, repair kits, or production runs. The spring dimensions are identical across all pack sizes for the same OD and length combination — only the quantity differs.

Are the 305mm length variants full-length springs or cut-to-length stock?

The 305mm variants are individual springs wound to that free length — they are not cut from a longer stock coil. This makes them suitable for applications requiring a long, slender compression spring such as pen mechanisms, slide actuators, or extended-travel return springs.

How do I decide between the 3mm and 4mm outer diameter options?

Choose based on the inner diameter of your spring seat or bore. A 3mm OD spring fits a bore of approximately 3.2mm or larger, while a 4mm OD spring requires approximately 4.2mm or larger. If your bore is between sizes, select the smaller OD to ensure clearance. Also consider that a larger OD spring with the same wire diameter will generally have a lower spring rate.

🛒 Select your Wire Diameter, Outer Diameter, and Length & Quantity above, then add to cart.

Compression Spring Wire Dia 0.3mm Pressure Small Stainless steel Micro Miniature

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Description

Micro Compression Springs — Precision 0.3mm Wire Diameter for Tight-Tolerance Applications

✅ Key Features of These Micro Compression Springs

📐 Technical Specifications — Micro Compression Springs

❓ Frequently Asked Questions

Compression Spring Wire Dia 0.3mm Pressure Small Stainless steel Micro Miniature

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