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Finding a compression spring that fits your exact application can be frustrating — too stiff and it binds, too soft and it collapses under load. Whether you are a hobbyist building a custom mechanism, a maker prototyping a new device, or a technician replacing a worn-out spring in a machine, having the right wire diameter and outer diameter combination is critical. These 100mm long compression springs are stocked in a wide range of sizes to eliminate guesswork and get your project moving.
Each spring is 100 mm (3.94 in) in free length and is available in outer diameters from 3 mm (0.12 in) up to 30 mm (1.18 in). Wire diameters span 0.5 mm through 1.8 mm, giving you fine control over spring rate and load capacity. Material options include spring steel, stainless steel (304 grade), and zinc-plated carbon steel, sold in packs of 1, 2, or 5 pieces depending on the variant selected.
Typical use cases include DIY mechanical assemblies requiring a 100mm coil spring replacement, small-engine valve return springs, 3D-printer bed levelling springs, electronics enclosure latches, and custom jig or fixture clamping mechanisms. The broad diameter range makes these springs suitable for both light-duty hobby applications and moderate industrial tasks.
Every spring is manufactured to a 100 mm (3.94 in) free length, making direct size-for-size replacements straightforward and predictable.
Outer diameters from 3 mm to 30 mm cover the majority of standard spring housings, guide pins, and custom DIY fixtures without modification.
Wire diameters from 0.5 mm to 1.8 mm let you dial in the spring rate — thinner wire for light-touch applications, thicker wire for higher-load tasks.
Choose spring steel for cost-effective general use, stainless steel (304) for corrosion-resistant environments, or zinc-plated carbon steel for added surface protection in humid conditions.
Available in packs of 1, 2, or 5 pieces depending on the variant, so you can order exactly what you need — no excess stock, no shortage mid-project.
Springs feature closed ends for stable seating on flat surfaces and guide rods, reducing lateral deflection and extending service life under repeated compression cycles.
| Free Length | 100 mm (3.94 in) |
|---|---|
| Outer Diameter Range | 3 mm – 30 mm (0.12 in – 1.18 in) |
| Wire Diameter Range | 0.5 mm – 1.8 mm |
| Material Options | Spring Steel / Stainless Steel (304) / Zinc-Plated Carbon Steel |
| End Type | Closed ends |
| Spring Rate | See variant options |
| Load Capacity | See variant options |
| Pack Quantity | 1 pc / 2 pcs / 5 pcs (see variant) |
| Surface Finish | Natural (spring steel), Passivated (stainless), Zinc-plated (carbon steel) |
| Operating Temperature | Spring steel: typically –40°C to +120°C; Stainless: up to +200°C |
Measure the inner diameter of your spring housing or the outer diameter of your guide rod. For a housing bore, the spring OD should be approximately 0.5–1 mm smaller than the bore to allow free travel. For a guide rod, the spring ID (OD minus twice the wire diameter) should be 0.5–1 mm larger than the rod diameter. Select the variant whose OD matches these clearances.
Spring steel (high-carbon steel) offers excellent elasticity and fatigue resistance at a lower cost, making it ideal for dry indoor environments. Stainless steel (304 grade) provides significantly better corrosion resistance and is the right choice for outdoor, marine, food-adjacent, or humid environments where rust would degrade performance over time.
Zinc plating provides a sacrificial barrier that slows corrosion in mildly humid or outdoor conditions. However, zinc plating is not as durable as stainless steel in continuously wet or salt-spray environments. For long-term outdoor or marine use, choose the stainless steel variant instead.
Spring rate (k) is determined by wire diameter, coil diameter, and number of active coils: k = (G × d⁴) / (8 × D³ × n), where G is the shear modulus, d is wire diameter, D is mean coil diameter, and n is the number of active coils. If you need a specific spring rate, contact us with your load and deflection requirements and we can help identify the best variant.
Yes. The smaller diameter variants (3–8 mm OD, 0.5–0.8 mm wire) are commonly used for 3D-printer bed levelling, filament tensioners, and PCB standoff mechanisms. The consistent 100 mm free length makes them easy to cut to a shorter working length if needed, though cutting will alter the spring rate.
Pack quantity varies by variant and is clearly shown in the "Material Selection & Qty" option: 5 pcs, 2 pcs, or 1 pc. Select the quantity that matches your project needs before adding to cart. Ordering multiple packs is supported if you need larger quantities.
Maximum load depends on the specific wire diameter and outer diameter combination selected. Thicker wire diameters (1.4–1.8 mm) paired with smaller outer diameters produce higher spring rates and load capacities. For exact load data for a specific variant, contact us to confirm before ordering for safety-critical applications.
