Compression Steel Spring Wire Dia 3mm OD 16/17/18/19mm Pressure Coil Springs

Roll over image to zoom in Click on image to zoom

Compression Steel Spring Wire Dia 3mm OD 16/17/18/19mm Pressure Coil Springs

HomeDIYer

No reviews

By HomeDIYer®

Wire Diameter x Outer Diameter: 3mm x 16mm

Length: 20mm

Packing QTY (Piece): 1 PCS

Price:

$6.38 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

Share this product

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

DIY Expert Support

Get fitment advice & recommendations

Mon–Fri 8:30 AM – 8:00 PM

WhatsApp Email Us

24-Hour Fast Ship

Arrives in 3–14 Days

Worldwide Shipping

30-Day Returns

1 tree planted with every purchase

3mm Wire Compression Coil Springs — Reliable Pressure for Every DIY Mechanism

When a mechanism fails because a spring loses tension too quickly or snaps under load, the entire project stalls. Hobbyists, makers, and small workshop operators who build custom jigs, fixtures, tooling, or automation assemblies need a compression spring they can count on across repeated cycles. These 3mm wire diameter pressure coil springs are engineered for consistent return force and long service life in demanding DIY and light-industrial applications.

Each spring is formed from steel wire with a nominal wire diameter of 3mm (0.118 in). The outer diameter (OD) is available in four sizes — 16mm (0.630 in), 17mm (0.669 in), 18mm (0.709 in), and 19mm (0.748 in) — and free lengths range from 20mm (0.787 in) up to 305mm (12.008 in), giving you precise control over spring rate and travel. Packing options of 1, 2, 5, or 10 pieces let you order exactly what your build requires.

Typical use cases include compression spring replacement in hand tools and power-tool accessories, return-force elements in DIY pneumatic or mechanical actuators, and preload components in 3D-printer extruder assemblies or CNC router fixtures — all scenarios where a consistent, repeatable spring force is critical to reliable operation.

🔧 Compatible with standard spring seats and pockets sized for 3mm wire / OD 16–19mm compression springs. Verify your bore diameter and free-length clearance before ordering.

✅ Key Features of These 3mm Wire Compression Coil Springs

📐 Four OD Options in One Listing
Choose from 16mm, 17mm, 18mm, or 19mm outer diameter — all sharing the same 3mm wire gauge — so you can match the exact bore or pocket in your assembly without sourcing from multiple suppliers.
📏 Wide Free-Length Range
Available in 17 length steps from 20mm to 305mm (0.787 in – 12.008 in), enabling fine-tuned spring rate and stroke selection for everything from compact mechanisms to longer travel actuators.
⚙️ Steel Construction for Consistent Return Force
Formed from steel wire to deliver repeatable compression and extension cycles, maintaining spring rate stability across the service life of your tool or fixture.
🔄 Closed & Ground Ends
Squared and ground end coils provide flat, stable seating surfaces that reduce lateral deflection and ensure the spring sits squarely in its pocket or against its retainer.
📦 Flexible Pack Quantities
Order 1, 2, 5, or 10 pieces per pack — ideal whether you need a single replacement spring or a small batch for a production run or workshop stock.
🛠️ Broad DIY & Light-Industrial Compatibility
Suited for hand tools, jigs, fixtures, 3D-printer extruders, CNC router hold-downs, pneumatic return mechanisms, and general-purpose compression spring applications.

📐 Technical Specifications — Compression Coil Springs

Wire Diameter	3mm (0.118 in)
Outer Diameter (OD)	16mm / 17mm / 18mm / 19mm (0.630–0.748 in)
Free Length	20mm – 305mm (0.787 in – 12.008 in) — see variant options
End Type	Closed & Ground (squared ends)
Material	Steel wire
Spring Type	Compression (pressure coil)
Spring Rate	See variant options
Load Capacity	See variant options
Finish / Coating	See variant options
Pack Quantity	1 / 2 / 5 / 10 PCS — see variant options

❓ Frequently Asked Questions

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

Measure the bore or pocket your spring will sit in. The spring's OD should be slightly smaller than the bore to allow free movement without binding. For a 16mm bore, choose the 16mm OD spring; for a 19mm bore, choose 19mm. If the spring slides over a rod, the rod diameter should be smaller than the spring's inner diameter (OD minus twice the wire diameter, so approximately 10–13mm for this range).

How do I select the correct free length?

The free length should be longer than your required compressed length plus the desired travel (stroke). As a starting point, measure the available space in your assembly when the spring is fully extended, then subtract the compressed height you need. Choose the next available length step that fits within your clearance envelope.

Are these springs suitable for outdoor or humid environments?

These are steel wire compression springs. For outdoor or high-humidity environments, corrosion protection is recommended — such as applying a light coat of machine oil or grease, or housing the spring in a protected enclosure. If your application requires inherent corrosion resistance, contact us to confirm finish options before ordering.

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

The inner diameter equals the outer diameter minus twice the wire diameter. For this product range: 16mm OD → ~10mm ID; 17mm OD → ~11mm ID; 18mm OD → ~12mm ID; 19mm OD → ~13mm ID. These are nominal values — contact us to confirm if your application requires tight ID tolerances.

Can I use these springs in a 3D printer extruder or CNC fixture?

Yes. These compression coil springs are commonly used in 3D-printer extruder assemblies (for bed leveling or filament tension), CNC router hold-down clamps, and fixture return mechanisms. Select the OD and free length that match your design's spring pocket and required preload travel.

How many pieces do I need to order, and can I mix sizes?

Each variant is sold in packs of 1, 2, 5, or 10 pieces of the same OD and length combination. To order multiple sizes, add each size as a separate line item to your cart. This lets you stock a range of springs for different projects without committing to large quantities of any single size.

What is the spring rate, and how does it affect my project?

Spring rate (measured in N/mm or lbf/in) describes how much force is required to compress the spring by one unit of length. A higher spring rate means stiffer resistance; a lower rate means softer. The spring rate for each OD/length combination varies — contact us to confirm the rate for your specific variant if your application has a defined load requirement.

🛒 Select your Wire Diameter × OD, Length, and Quantity above, then add to cart.

91%

(1770)

(128)

(21)

(5)

(17)

281

These o rings are a great for my ear tunnels

These o rings are a great for my ear tunnels, always loosing one here and there, I always have a new ones in the drawer. Being silicone, don't have any reactions compared to standard rubber ones I purchased at hardware stores, plus much less expensive. Purchased 16mm I'd to use on 19mm tunnels, and stay on great, might be able to get away with 17mm rings, but really happy with my choice.

Will never order from these folks again

I waited a long time and that’s all I received was the eyebolt with no threaded rod attached to it

Perfect they are really made well and I used them for my car

Perfect they are really made well and I used them for my car. The only thing I had a great for us. It took three weeks to get here. So shipping was slow.

did not include wing nuts

Hi Scott, thank you for your feedback. We're sorry for any inconvenience caused. Please get in touch with us directly, and we'll assist you. Thanks for shopping with HomeDIYer!

Haven't received the order yet! It's been over

Haven't received the order yet! It's been over 19 days!

1 2 3

Compression Steel Spring Wire Dia 3mm OD 16/17/18/19mm Pressure Coil Springs

Payment & Security

DIY Expert Support

Description

3mm Wire Compression Coil Springs — Reliable Pressure for Every DIY Mechanism

✅ Key Features of These 3mm Wire Compression Coil Springs

📐 Technical Specifications — Compression Coil Springs

❓ Frequently Asked Questions

Compression Steel Spring Wire Dia 3mm OD 16/17/18/19mm Pressure Coil Springs

You may also like

Recently viewed

Let customers speak for us