{"product_id":"compression-spring-4-12mm-diameter-18mm-length-stainless-steel","title":"Compression Spring Various Size 4 - 12mm Diameter \u0026 18mm Length Pressure Small","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCompression Springs 4–12mm Diameter, 18mm Length — Reliable Force for Every Mechanical Build\u003c\/h2\u003e\n\u003cp\u003eWhen your project demands consistent spring force in a compact form factor, finding the right compression spring can be frustrating — wrong wire diameter, wrong outer diameter, or springs that lose tension after a few cycles. These compression springs are designed for makers, engineers, and DIY builders who need precise, repeatable performance across a wide range of sizes.\u003c\/p\u003e\n\u003cp\u003eEach spring is manufactured from stainless steel wire with diameters ranging from 0.6 mm to 1 mm (0.024\"–0.039\"), outer diameters from 4 mm to 12 mm (0.16\"–0.47\"), and a free length of 18 mm (0.71\"). The helical coil geometry provides linear load characteristics suitable for light-to-medium duty applications.\u003c\/p\u003e\n\u003cp\u003eThese compression springs are well-suited for use in 3D printer bed leveling mechanisms, small robotics actuators and gripper assemblies, electronic enclosure latches and push-button return mechanisms, and precision jig and fixture clamping setups requiring consistent preload.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔧\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Suitable for standard spring seats and bores sized to match the selected outer diameter. Verify bore clearance and seat depth against your chosen variant before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These Compression Springs\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eWide Size Range\u003c\/strong\u003e\n\u003cp\u003eAvailable in outer diameters from 4 mm to 12 mm and wire diameters from 0.6 mm to 1 mm — one listing covers the full spectrum of small compression spring needs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e\n\u003cp\u003eMade from stainless steel wire, offering solid corrosion resistance for indoor mechanical assemblies, humid environments, and applications where carbon steel would oxidize.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003eConsistent 18 mm Free Length\u003c\/strong\u003e\n\u003cp\u003eAll variants share an 18 mm (0.71\") free length, making it straightforward to swap diameters without redesigning your spring pocket depth.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n\u003cstrong\u003eHelical Coil Design\u003c\/strong\u003e\n\u003cp\u003eThe open-coil helical geometry delivers linear compression force, predictable deflection behavior, and reliable return stroke — essential for repeatable mechanical actuation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n\u003cstrong\u003eSold in 10-Piece Sets\u003c\/strong\u003e\n\u003cp\u003eEach order includes 10 pieces of your selected size, giving you spares for prototyping, testing, and replacement without needing to reorder frequently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔬\u003c\/div\u003e\n\u003cstrong\u003ePrecision Wire Diameter Options\u003c\/strong\u003e\n\u003cp\u003eChoose from 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm wire diameter to match the spring rate and load capacity your application requires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Compression Springs\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCompression (helical coil)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e18 mm (0.71\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e4 mm – 12 mm (0.16\" – 0.47\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWire Diameter Range\u003c\/th\u003e\n\u003ctd\u003e0.6 mm – 1 mm (0.024\" – 0.039\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoil Direction\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEnd Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpring Rate\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e10 pcs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose the right outer diameter for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eMeasure the bore or spring pocket in your assembly. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a shaft-guided spring, the inner diameter (outer diameter minus twice the wire diameter) should be slightly larger than the shaft. Select your outer diameter variant accordingly from the options above.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the wire diameter options (0.6 mm vs 1 mm)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWire diameter directly affects spring rate and load capacity. A thicker wire (e.g., 1 mm) produces a stiffer spring that requires more force to compress, while a thinner wire (e.g., 0.6 mm) yields a softer spring with lower load capacity. Choose a thicker wire when you need higher resistance or preload, and a thinner wire for lighter-duty return or cushioning applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these springs corrosion-resistant enough for outdoor or humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese springs are made from stainless steel, which provides good resistance to rust and oxidation in typical indoor and moderately humid conditions. For prolonged outdoor exposure or contact with harsh chemicals or saltwater, additional protective measures or a higher-grade stainless alloy may be advisable. Contact us to confirm suitability for your specific environment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these springs in 3D printers or CNC machines?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These compression springs are commonly used in 3D printer bed leveling assemblies, CNC router dust shoe returns, and similar precision motion applications. The consistent 18 mm free length and range of outer diameters make them compatible with many standard spring pockets found in maker hardware. Verify the outer diameter and wire diameter match your specific printer or machine's spring specification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many springs are included per order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eEach order includes 10 pieces of your selected size combination (length, wire diameter, outer diameter, and material). This gives you extras for prototyping, testing, or future replacements without needing to place a separate order.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat should I check before selecting a variant to ensure compatibility?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eBefore ordering, confirm three key dimensions against your design: (1) outer diameter — must fit freely inside the bore or housing; (2) wire diameter — determines spring rate and load; (3) free length — all variants are 18 mm, so verify your assembly has sufficient travel and pocket depth. If you are unsure, contact us with your application details and we can help you select the right variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these springs be used in electronic enclosures or push-button mechanisms?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The smaller diameter variants (4 mm–6 mm outer diameter, 0.6 mm–0.7 mm wire) are well-suited for push-button return springs, battery contact springs, and latch mechanisms in electronic enclosures. The stainless steel material also avoids the conductivity concerns associated with some coated carbon steel springs in sensitive electronic environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your diameter, wire size, and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"18 mm \u0026 0.6 mm \/ 5 mm \/ Stainless steel \u0026 10pcs","offer_id":52449248608530,"sku":"LXX6DFQ993x1","price":3.21,"currency_code":"USD","in_stock":true},{"title":"18 mm \u0026 0.6 mm \/ 6 mm \/ Stainless steel \u0026 10pcs","offer_id":52449248641298,"sku":"LXX6DFQ1011x1","price":3.21,"currency_code":"USD","in_stock":true},{"title":"18 mm \u0026 0.6 mm \/ 8 mm \/ Stainless steel \u0026 10pcs","offer_id":52449248674066,"sku":"LXX6DFQ1046x1","price":3.21,"currency_code":"USD","in_stock":true},{"title":"18 mm \u0026 0.6 mm \/ 9 mm \/ Stainless 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