Compression Spring Spring Steel Pressure Coil 0.9mm Wire OD 5-25mm 5-100mm Heavy

No reviews

Price:
Sale price$5.37 USD
Stock:
In stock (500 units), ready to be shipped

Payment & Security

Ach Direct Debit Amazon American Express Apple Pay Bancontact BLIK Diners Club Discover EPS Google Pay iDEAL Wero JCB Maestro Mastercard Multibanco MobilePay PayPal Przelewy24 Shop Pay Twint Union Pay USDC Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Limited Offer — Spend More, Save More
Spend $55+
Save $5
Spend $100+
Save $10
Spend $200+
Save $25
HomeDIYer DIY Expert Support

DIY Expert Support

Get fitment advice & recommendations

Mon–Fri  8:30 AM – 8:00 PM
24-Hour Fast Ship
Arrives in 3–14 Days
Worldwide Shipping
30-Day Returns
1 tree planted with every purchase

Description

Compression Spring Steel Coil — Reliable Elastic Force for Precision Assemblies

When a project demands consistent return force in a tight space, finding the right compression spring can be a frustrating hunt through mismatched sizes and uncertain load ratings. Whether you are a maker building a custom mechanism, a technician replacing worn-out springs in machinery, or a hobbyist assembling a precision device, these compression springs give you the exact wire and coil dimensions you need to get the job done right the first time.

Each spring is wound from spring steel wire with a wire diameter of 0.9mm (approx. 0.035 in). Outer diameters span 5mm to 20mm (approx. 0.20–0.79 in), and free lengths range from 10mm to 100mm (approx. 0.39–3.94 in). The coil body is finished in a natural steel tone with a smooth surface that seats cleanly against flat or recessed contact faces.

These springs suit a wide range of applications: restoring plunger mechanisms in pneumatic tools, providing return force in jig fixtures and clamps, cushioning impact in small-scale robotics, and acting as tension elements in custom DIY hardware assemblies. The broad size matrix — 16 outer diameters × 14 free lengths — means you can source the exact spring geometry without custom fabrication.

🔧 Compatibility: Suitable for spring-loaded plungers, mechanical assemblies, jig fixtures, robotics, and general DIY hardware requiring a 0.9mm wire compression spring. Verify inner bore clearance and free-length travel before ordering.

✅ Key Features of These Compression Spring Steel Coils

🔩
0.9mm Wire Diameter

Consistent wire gauge across all size variants ensures predictable spring rate and reliable elastic return force in compact assemblies.

📐
Wide Size Matrix

Outer diameters from 5mm to 20mm and free lengths from 10mm to 100mm give you 224 size combinations to match your exact bore and travel requirements.

⚙️
Spring Steel Construction

Wound from spring steel wire for strong elastic memory, allowing repeated compression and extension cycles without permanent deformation under normal operating loads.

🛡️
Smooth Coil Surface

Clean winding finish reduces friction against guide rods and bores, helping the spring seat evenly and extend its service life in sliding or guided applications.

📦
10-Piece Pack

Each order ships as a 10-piece set, giving you spares for prototyping, replacement, or multi-position assemblies without ordering in bulk.

🔄
Versatile Application Range

Suited for plunger mechanisms, jig fixtures, robotics, pneumatic tools, and general DIY hardware — anywhere a compact, reliable compression spring is needed.

📐 Technical Specifications — Compression Spring

Wire Diameter 0.9mm (approx. 0.035 in)
Outer Diameter (OD) 5mm – 20mm (approx. 0.20–0.79 in)
Free Length 10mm – 100mm (approx. 0.39–3.94 in)
Material Spring Steel
Surface Finish Natural steel (uncoated)
Spring Type Compression (closed / ground ends)
Spring Rate See variant options
Max Load Capacity See variant options
Inner Diameter (ID) See variant options
Quantity per Pack 10 PCS

❓ Frequently Asked Questions

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

Measure the bore or housing that will guide the spring. The spring's outer diameter should be slightly smaller than the bore so it can compress freely without binding. For guide-rod applications, the inner diameter of the spring should be slightly larger than the rod. Select your OD from the Size dropdown above, then confirm the resulting inner diameter fits your rod clearance.

What free length should I select?

Free length is the uncompressed length of the spring. Choose a free length that is longer than your required compressed length by at least the travel distance you need. For example, if you need 20mm of travel and the spring must be compressed to 30mm, select a free length of at least 50mm. Available lengths run from 10mm to 100mm in this listing.

How strong are these springs — what load can they handle?

Load capacity depends on the specific OD and free-length combination. Spring steel wire at 0.9mm diameter provides moderate spring rates suitable for light-to-medium duty applications such as plunger returns, jig fixtures, and small robotics. For heavy-duty industrial loads, verify the spring rate against your force requirements. Contact us to confirm if you need specific load data for your size.

Are these springs corrosion-resistant?

These springs are made from uncoated spring steel, which offers good mechanical properties but limited corrosion resistance in wet or chemically aggressive environments. For outdoor or humid applications, consider applying a light coat of machine oil or grease after installation. If corrosion resistance is a primary requirement, stainless steel springs may be a better fit for your project.

Can I use these springs in a guide-rod assembly?

Yes. Select an OD that gives adequate clearance inside the housing bore, and confirm the inner diameter is larger than your guide rod diameter. The smooth coil surface reduces friction against the rod, helping the spring travel evenly. For best results, keep the guide rod diameter at least 1–2mm smaller than the spring's inner diameter to allow free movement without binding.

How many springs come in each order?

Each order includes 10 pieces of the selected size. This gives you spares for prototyping, multi-position assemblies, or replacement stock without committing to a large bulk order. All 10 pieces in a pack are the same size as selected in the Size dropdown.

What is the difference between the various OD options — which is most commonly used?

Smaller ODs (5–8mm) are typically used in compact mechanisms, electronics enclosures, and precision instruments. Mid-range ODs (9–14mm) suit general-purpose jig fixtures, tool returns, and robotics. Larger ODs (15–20mm) are common in heavier mechanical assemblies and industrial tooling. Choose based on your bore size and the force level your application requires.

🛒 Select your Size (OD × Length) above, then add to cart.

You may also like

Recently viewed