Compression Springs with 8mm Free Height & 5mm Outer Diameter — Reliable Force for Tight Spaces When your project demands a compact, consistent return force in a confined space, undersized or mismatched springs cause misfires, binding, and premature failure. Engineers, hobbyists, and repair technicians working on small mechanisms, electronic assemblies, and precision tooling need springs they can count on — sized exactly right from the start. These compression springs are designed for exactly that challenge. Each spring features a free height of 8mm (approx. 0.31 in) and an outer diameter of 5mm (approx. 0.20 in), wound from steel wire with a diameter typically in the 0.4–0.6mm range. The coil geometry delivers a consistent spring rate suitable for light-to-medium load applications. Available in convenient multi-pack quantities of 30, 50, 80, or 100 pieces to match your project scale. These springs are well-suited for a wide range of use cases: replacing worn return springs in push-button switches and pen mechanisms, providing preload tension in small jigs and fixtures, and acting as cushioning elements in DIY automation projects such as limit switch assemblies or lightweight actuator returns. Their compact form factor also makes them a go-to choice for model-making, robotics prototyping, and electronics enclosure latches. 🔧 Compatibility: Suitable for any application requiring a compression spring with ~5mm OD and ~8mm free height. Verify your bore diameter and travel requirements before ordering. Inner diameter is typically 3.5–4.2mm. ✅ Key Features of These Compression Springs 📏 Precise Compact Dimensions Free height of 8mm (0.31 in) and outer diameter of 5mm (0.20 in) deliver a consistent fit in tight bores and small assemblies where space is at a premium. ⚙️ Consistent Spring Rate Uniform coil pitch and wire diameter ensure repeatable force output across every spring in the pack — critical for mechanisms that require matched spring behavior. 🛡️ Steel Construction for Durability Wound from steel wire, these springs resist deformation under repeated compression cycles, maintaining their free height and load characteristics over extended service life. 📦 Multi-Pack Quantities Choose from 30, 50, 80, or 100-piece packs — ideal for stocking your parts bin, completing a batch build, or having spares on hand for ongoing maintenance tasks. 🔩 Versatile Application Range From push-button return mechanisms and pen clips to robotics preload assemblies and DIY automation limit switches — these springs handle a broad spectrum of light-to-medium load tasks. ✅ Ready to Use Out of the Pack No additional finishing or preparation required. Springs arrive ready to install directly into your assembly, saving time on prototyping and repair workflows. 📐 Technical Specifications — Compression Spring Free Height 8mm (approx. 0.31 in) Outer Diameter (OD) 5mm (approx. 0.20 in) Inner Diameter (ID) Typically 3.5–4.2mm (approx. 0.14–0.17 in) Wire Diameter Typically 0.4–0.6mm Material Steel Finish See variant options Spring Type Compression (closed ends) Spring Rate See variant options End Type Closed / Ground (typical) Pack Quantity 30 / 50 / 80 / 100 pcs (select above) ❓ Frequently Asked Questions How do I choose the right quantity pack for my project? For one-off repairs or prototyping, the 30-piece pack is usually sufficient. If you are running a batch build, stocking a workshop, or working on a production run of small assemblies, the 80 or 100-piece packs offer better value per spring. Having extras on hand also ensures you can replace worn springs quickly without reordering. What is the load capacity of these compression springs? These springs are designed for light-to-medium load applications. The exact spring rate depends on the wire diameter and coil count of the specific batch. For applications requiring a precise load rating (e.g., safety-critical mechanisms), we recommend measuring a sample spring or contacting us to confirm specifications before committing to a large quantity. Are these springs corrosion-resistant? These springs are made from steel wire. For indoor, dry-environment applications they perform reliably over extended use. If your application involves moisture, humidity, or outdoor exposure, consider applying a light coat of machine oil or using them in a protected housing. For highly corrosive environments, a stainless steel spring may be more appropriate. Will a 5mm OD spring fit my application? The 5mm outer diameter means you need a bore or housing with an inner diameter of at least 5.2–5.5mm to allow free movement without binding. The inner diameter of the spring (typically 3.5–4.2mm) determines the maximum shaft or pin diameter it can slide over. Always verify both your bore ID and shaft OD against these dimensions before ordering. Can I use these springs in electronics or PCB assemblies? Yes. The compact 8mm × 5mm form factor is well-suited for use in push-button contacts, battery terminal springs, and PCB-mounted spring contacts. Ensure the spring's free height and compressed height match your assembly's travel requirements, and verify that the spring material is compatible with any conductive contact requirements in your circuit. How do I measure if this spring is the right replacement for a worn one? Measure the worn spring's outer diameter, free height (uncompressed length), and wire diameter using calipers. Compare these to the 5mm OD and 8mm free height of this spring. If the worn spring has deformed significantly, also check the original equipment's housing bore and shaft dimensions as a reference. A spring that matches within ±0.2mm on OD and ±0.5mm on free height is typically a suitable replacement for non-critical applications. Are these springs suitable for DIY automation and robotics projects? Absolutely. These springs are commonly used in DIY automation for limit switch preloading, lightweight actuator return mechanisms, and spring-loaded clamp assemblies. Their small size makes them easy to integrate into 3D-printed housings and standard hardware fittings. The multi-pack options mean you can prototype with several configurations before settling on your final design. 🛒 Select your quantity (pcs) above, then add to cart. { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How do I choose the right quantity pack for my project?", "acceptedAnswer": { "@type": "Answer", "text": "For one-off repairs or prototyping, the 30-piece pack is usually sufficient. If you are running a batch build, stocking a workshop, or working on a production run of small assemblies, the 80 or 100-piece packs offer better value per spring." } }, { "@type": "Question", "name": "What is the load capacity of these compression springs?", "acceptedAnswer": { "@type": "Answer", "text": "These springs are designed for light-to-medium load applications. The exact spring rate depends on the wire diameter and coil count of the specific batch. Contact us to confirm specifications for precision applications." } }, { "@type": "Question", "name": "Are these springs corrosion-resistant?", "acceptedAnswer": { "@type": "Answer", "text": "These springs are made from steel wire and perform reliably in indoor, dry-environment applications. For moisture or outdoor exposure, apply a light coat of machine oil or use in a protected housing." } }, { "@type": "Question", "name": "Will a 5mm OD spring fit my application?", "acceptedAnswer": { "@type": "Answer", "text": "You need a bore with an inner diameter of at least 5.2–5.5mm for free movement. The inner diameter (typically 3.5–4.2mm) determines the maximum shaft or pin diameter it can slide over." } }, { "@type": "Question", "name": "Can I use these springs in electronics or PCB assemblies?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. The compact 8mm × 5mm form factor suits push-button contacts, battery terminal springs, and PCB-mounted spring contacts. Verify free height, compressed height, and material compatibility with your circuit requirements." } }, { "@type": "Question", "name": "How do I measure if this spring is the right replacement for a worn one?", "acceptedAnswer": { "@type": "Answer", "text": "Measure the worn spring's outer diameter, free height, and wire diameter with calipers. A spring matching within ±0.2mm on OD and ±0.5mm on free height is typically a suitable replacement for non-critical applications." } }, { "@type": "Question", "name": "Are these springs suitable for DIY automation and robotics projects?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. These springs are commonly used for limit switch preloading, lightweight actuator return mechanisms, and spring-loaded clamp assemblies in DIY automation and robotics projects." } } ] }
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