Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring
Roll over image to zoom in Click on image to zoom
Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure SpringCompression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring

Compression Spring 3mm Wire Diameter 30-40mm OD 30-100mm Length Pressure Spring

HomeDIYer
No reviews

By HomeDIYer®

Price:
$4.88 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
✅ Discount applied automatically at checkout 🚚 Free shipping on orders over $89
HomeDIYer DIY Expert Support

DIY Expert Support

Get fitment advice & recommendations

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

Description

Compression Spring 3mm Wire Diameter — Reliable Pressure Spring for DIY & Automation

When a project demands consistent return force and dimensional precision, a mismatched or undersized compression spring becomes the weakest link. Engineers, robotics builders, and hands-on DIYers who need a dependable pressure spring with a 3mm wire diameter will find this range covers the most common outer diameter and free-length combinations in a single listing.

Each spring is formed from round wire with a 3mm cross-section. Outer diameters span 30–40mm (approximately 1.18–1.57 in) and free lengths run from 20mm up to 100mm (roughly 0.79–3.94 in). The coil geometry follows a closed-and-ground end configuration typical of industrial compression springs, providing flat seating surfaces for stable load application.

Typical applications include mechanical return mechanisms in 3D-printer extruder assemblies, spring-loaded clamps and fixtures for small-batch manufacturing, vibration-isolation mounts in robotics frames, and valve or plunger return springs in pneumatic or hydraulic DIY builds. The broad size matrix lets you match free length and outer diameter to your bore or shaft without custom fabrication.

⚙️ Compatibility: Suitable for spring guides or bores sized to accept 30–40mm OD springs. Verify inner diameter clearance against your shaft or guide rod before ordering.

✅ Key Features of These Compression Pressure Springs

  • 🔩3mm Round Wire Diameter — Consistent cross-section throughout the coil for uniform stress distribution and predictable spring rate.
  • 📐Wide Size Matrix — Outer diameters from 30mm to 40mm and free lengths from 20mm to 100mm cover the majority of standard bore and shaft configurations.
  • 🛡️Closed & Ground Ends — Flat end coils provide stable, square seating on both faces, reducing lateral deflection under load.
  • ⚡Consistent Spring Rate — Uniform coil pitch across the active coils delivers linear force-deflection behavior suitable for precision mechanisms.
  • 🔄Multi-Pack Options — Available in packs of 1, 5, 10, or 20 pieces so you can stock spares or fulfill small-batch production runs without overpaying.
  • 🏭Industrial-Grade Construction — Wound to tight dimensional tolerances for repeatable performance across interchangeable assemblies in robotics and automation.

📐 Technical Specifications — Compression Spring

Wire Diameter 3mm (0.118 in)
Outer Diameter Range 30–40mm (1.18–1.57 in)
Free Length Range 20–100mm (0.79–3.94 in)
End Type Closed and ground
Coil Direction See variant options
Material See variant options
Surface Finish See variant options
Spring Rate See variant options
Max Load Capacity See variant options
Pack Size 1 / 5 / 10 / 20 pieces

❓ Frequently Asked Questions

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

Measure the inner diameter of your bore or the outer diameter of your guide shaft. For a bore-guided spring, the spring OD should be 1–2mm smaller than the bore ID to allow free movement. For a shaft-guided spring, the spring ID (OD minus twice the wire diameter) should be 1–2mm larger than the shaft OD. Use the variant selector to pick the OD that fits your clearance requirements.

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 working length by at least the deflection you need. For example, if you need 20mm of travel and want the spring to operate at mid-deflection, a free length of 50–60mm is a reasonable starting point. Always confirm against your assembly's available spring pocket depth.

Are these springs suitable for corrosive or outdoor environments?

Corrosion resistance depends on the specific material and finish of the variant you select. If your application involves moisture, chemicals, or outdoor exposure, contact us to confirm the material specification before ordering. For demanding environments, a stainless steel or coated variant is generally recommended over plain carbon steel.

Can I use these springs in high-temperature applications?

Standard spring steel loses temper and spring rate at elevated temperatures, typically above 120–150°C for carbon steel variants. If your application involves sustained heat, please contact us to confirm the material grade and its rated temperature range before purchasing.

What is the difference between the pack size options?

All pack sizes contain identical springs — only the quantity differs. Packs of 1 are ideal for prototyping or single repairs. Packs of 5 or 10 suit small-batch builds or keeping spares on hand. Packs of 20 offer the best per-unit value for production runs or stocking a workshop. Select your preferred pack size using the Pack Size(Pcs) option above.

How do I verify the spring rate before committing to a large order?

We recommend ordering a single-piece sample first to test fit, deflection, and load characteristics in your actual assembly. Once confirmed, you can reorder in larger pack sizes. If you need specific spring rate data for engineering calculations, contact us with your OD and free length selection and we will provide available technical data.

Are these springs compatible with 3D-printer extruder or bed-leveling assemblies?

Many 3D-printer designs use compression springs in the 3mm wire diameter range for extruder tension arms, bed-leveling corners, and Z-axis mechanisms. Check your printer's BOM or community documentation for the required OD and free length, then match to the appropriate variant. The closed-and-ground ends provide stable seating on printed or machined spring pockets.

🛒 Select your Wire Dia x Outer Dia x Length and Pack Size above, then add to cart.

 

You may also like

Recently viewed