Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel
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Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring SteelWire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring SteelWire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring SteelWire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring SteelWire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring SteelWire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring SteelWire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel

Wire Dia. 3mm OD 17-40mm Length 20-100mm Small Spring Compression Spring Steel

HomeDIYer
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By HomeDIYer®

Price:
$13.99 USD
Stock:
In stock (500 units), ready to be shipped

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Description

3mm Wire Compression Springs — Reliable Coil Force for Tight Spaces

When a mechanism fails because a spring is too weak, too long, or simply the wrong size, the whole project stalls. Makers, engineers, and workshop technicians who need a compact, consistent compression spring with a 3mm wire diameter and outer diameters from 17mm to 40mm (0.67"–1.57") will find this range covers the most common small-spring applications without over-engineering the solution.

Each spring is wound from carbon steel wire with a nominal wire diameter of 3mm (0.118"). Outer diameters span 17mm to 40mm (0.67"–1.57"), and free lengths run from 20mm to 200mm (0.79"–7.87"), giving you precise control over travel and load. Springs are available in packs of 2 or 5 pieces depending on the size selected.

Typical use cases include DIY automation jigs requiring consistent return force, light industrial machinery needing compact coil springs for valve or plunger assemblies, and hobbyist robotics or 3D-printer extruder mechanisms where a small-diameter compression spring with a defined outer diameter keeps components seated reliably.

⚙️ Compatibility: Suitable for spring seats, bores, or guide rods sized to accept OD 17–40mm coil springs. Verify free length and spring rate against your application before ordering.

✅ Key Features of These 3mm Wire Compression Springs

  • 🔩Consistent 3mm Wire Diameter — Uniform wire cross-section across all sizes ensures predictable spring rate and load-bearing behaviour in every variant.
  • 📐Wide OD Range: 17–40mm — Covers a broad spectrum of bore and seat sizes (0.67"–1.57"), reducing the need to source from multiple suppliers for a single project.
  • 📏Multiple Free Lengths: 20–200mm — From short 20mm (0.79") spacer springs to longer 200mm (7.87") travel springs, the range accommodates varied stroke requirements.
  • 🛡️Carbon Steel Construction — Wound from carbon steel wire for solid mechanical strength and resistance to deformation under repeated compression cycles.
  • 📦Flexible Pack Quantities — Available in packs of 2 or 5 pieces depending on the selected size, so you can stock exactly what your project needs without excess.
  • 🔄Closed & Ground Ends (typical) — End coils are typically closed to provide a flat seating surface, improving stability in spring seats and reducing lateral deflection during compression.

📐 Technical Specifications — Compression Springs

Wire Diameter 3mm (0.118")
Outer Diameter (OD) 17mm – 40mm (0.67" – 1.57")
Free Length 20mm – 200mm (0.79" – 7.87")
Material Carbon Steel
Spring Type Compression (coil)
End Type See variant options
Surface Finish See variant options
Spring Rate See variant options
Pack Quantity 2 pcs or 5 pcs (varies by size)
Coil Direction Right-hand (typical)

❓ Frequently Asked Questions

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

Measure the bore or spring seat your spring will sit inside, then select an OD that is 0.5–1mm smaller than the bore for a sliding fit, or match the guide rod OD and choose an ID (OD minus twice the wire diameter) that clears the rod by at least 0.5mm. This range covers ODs from 17mm to 40mm (0.67"–1.57"), so check your seat dimensions before selecting a variant.

What free length should I select for my project?

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 amount of travel (compression) you need. For example, if you need 30mm of travel and a working length of 40mm, select a free length of at least 70mm. Available lengths in this range run from 20mm to 200mm.

Are these springs strong enough for industrial machinery use?

These springs are wound from carbon steel wire and are suited to light-to-medium duty applications such as valve returns, plunger assemblies, jig fixtures, and automation components. For heavy-duty or high-cycle industrial applications requiring certified spring rates and fatigue life data, please contact us to confirm suitability before ordering.

Will these springs rust or corrode over time?

Carbon steel springs can oxidise if exposed to moisture or corrosive environments without protection. For outdoor, wet, or chemically exposed applications, consider applying a light coat of oil or grease, or contact us to enquire about alternative material options. For dry indoor or enclosed mechanical use, carbon steel performs reliably over extended service life.

Can I use these springs in a 3D printer extruder or hobbyist robot?

Yes. The compact OD range (17–40mm) and short free lengths (from 20mm) make these springs well-suited to 3D printer extruder tensioners, filament guide mechanisms, and small robotic actuators where a defined return force is needed in a confined space. Select the OD and free length that match your design's spring seat and required travel.

How do I decide between a pack of 2 and a pack of 5?

Pack quantity varies by size variant — smaller or more common sizes are typically available in packs of 5, while larger or longer sizes are offered in packs of 2. The pack quantity is shown in the variant selector. If you need a specific quantity for a production run or bulk project, contact us for assistance.

What is the inner diameter (ID) of these springs?

The inner diameter equals the outer diameter minus twice the wire diameter. For example, a 3x20mm spring (wire dia. 3mm, OD 20mm) has an ID of approximately 14mm (20mm − 2×3mm). Use this formula to verify clearance over any guide rod in your assembly.

🛒 Select your size (Wire Dia. × OD × Length) and pack quantity above, then add to cart.

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