5pcs Wire Dia. 3.5 mm OD 19mm-50mm Small Springs Compression Spring Steel

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5pcs Wire Dia. 3.5 mm OD 19mm-50mm Small Springs Compression Spring Steel

HomeDIYer

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By HomeDIYer®

Wire Diameter: 3.5mm

Outer diameter: 19mm

Length & Quantity (pcs): 45mm & 5

Price:

$36.42 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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Compression Springs Wire Dia. 3.5mm — Reliable Force in a Compact Form

When your project demands consistent spring force in a tight space, undersized or mismatched springs cause binding, premature fatigue, and failed assemblies. Engineers, makers, and maintenance technicians who need a dependable stock of small compression springs will find this selection covers the most common OD and length combinations in a single listing.

Each pack contains 5 pieces of compression spring steel wire with a wire diameter of 3.5mm (0.138 in). Outer diameters span 18mm–50mm (0.71–1.97 in) and free lengths range from 20mm–100mm (0.79–3.94 in), giving you the flexibility to match the exact spring rate and travel your design requires.

These compression springs suit a wide range of applications: industrial machinery maintenance requiring small compression spring replacements, DIY robotics and automation builds needing precise return-force components, and prototyping or repair work on valves, latches, and mechanical actuators where a compact compression spring with 3.5mm wire diameter is specified.

⚙️ Compatibility: Suitable for spring housings, guide rods, and bores sized to accept the selected outer diameter. Verify free length and spring rate against your load requirements before ordering.

✅ Key Features of These Compression Springs

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3.5mm Wire Diameter

Consistent wire cross-section across all variants ensures predictable spring rate and load capacity for your mechanical design.

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Wide OD Range: 18–50mm

Outer diameters from 18mm to 50mm (0.71–1.97 in) cover the most common bore and housing sizes found in light industrial and DIY applications.

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Multiple Free Lengths: 20–100mm

Free lengths from 20mm to 100mm (0.79–3.94 in) let you dial in the travel and preload your assembly needs without custom fabrication.

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Spring Steel Construction

Wound from spring steel wire for reliable elastic return, resistance to set under repeated cycling, and durability in mechanical assemblies.

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5-Piece Pack

Each order ships as a pack of 5 identical springs, giving you spares for prototyping, testing, or replacement without over-ordering.

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Closed & Ground Ends (typical)

Closed ends provide a flat seating surface for stable load transfer against spring seats and housings — standard for this wire diameter class.

📐 Technical Specifications — Compression Spring

Wire Diameter	3.5 mm (0.138 in)
Outer Diameter (OD)	18 mm – 50 mm (0.71 – 1.97 in) — see variant options
Free Length	20 mm – 100 mm (0.79 – 3.94 in) — see variant options
Material	Spring Steel
End Type	Closed (typical for this wire diameter)
Quantity per Pack	5 pieces
Spring Rate	See variant options
Surface Finish	See variant options
Coil Direction	Right-hand (standard)

❓ Frequently Asked Questions

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

Measure the bore or housing your spring will sit inside, then select an OD that is 1–2mm smaller than the bore for a sliding fit, or match the guide rod OD to the spring's inner diameter (ID = OD minus twice the wire diameter). For a 3.5mm wire spring, ID = OD − 7mm. Use the variant selector above to pick the OD that fits your assembly.

What free length should I select?

Free length is the uncompressed length of the spring. Choose a free length longer than your required working length by at least the amount of travel (deflection) your application needs. If you need 30mm of travel and a 10mm compressed height, select a free length of at least 40mm. Available lengths in this listing range from 20mm to 100mm.

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

Load capacity depends on the specific OD and free length combination selected. Spring steel wire at 3.5mm diameter provides moderate-to-high load capacity for small springs. For precise spring rate (N/mm or lbf/in) values, contact us with your selected variant and we can provide the specification sheet.

Are these springs corrosion resistant?

These springs are made from spring steel, which offers good mechanical properties but moderate corrosion resistance. For environments with moisture or mild chemicals, consider applying a light oil or protective coating after installation. For highly corrosive environments, stainless steel springs would be a better choice.

What applications are these compression springs suitable for?

These springs are well-suited for: mechanical actuators and return mechanisms, valve and latch assemblies, robotics and automation prototypes, DIY machinery and equipment repair, jigs and fixtures, and general-purpose spring replacement in light industrial equipment. The 3.5mm wire diameter makes them appropriate for medium-load applications.

Can I use these springs outdoors or in wet conditions?

Spring steel has limited corrosion resistance when exposed to prolonged moisture. For outdoor or wet-environment use, apply a rust-inhibiting coating or lubricant, or select a stainless steel alternative. For indoor, dry, or lightly oiled environments, these springs perform reliably over many cycles.

Why buy a 5-piece pack instead of a single spring?

Having multiple springs on hand lets you test different preload configurations, replace worn springs quickly without waiting for reorder, and keep spares for ongoing maintenance. For prototyping and small-batch production, a 5-piece pack is the most practical and cost-effective quantity.

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