{"product_id":"400mm-long-compression-spring-16mm-120mm-diameter-pressure-coiled-springs","title":"400mm Long Compression Spring 16mm - 120mm Diameter，Pressure- coiled springs","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e400mm Compression Springs — Reliable Load Control for Mechanical and Automation Applications\u003c\/h2\u003e\n\u003cp\u003eEngineers and makers working on mechanical assemblies, CNC fixtures, or industrial automation often struggle to find compression springs that combine consistent load ratings with precise dimensional tolerances. These 400mm long compression springs are designed for builders who need dependable elastic return force across a wide range of outer diameters and wire gauges — without compromising on dimensional accuracy.\u003c\/p\u003e\n\u003cp\u003eEach spring is a single-piece coiled compression spring, manufactured from spring steel wire. Wire diameters range from 2.3 mm to 22 mm (approx. 0.09 in to 0.87 in), and outer diameters span 16 mm to 120 mm (approx. 0.63 in to 4.72 in). Free length is 400 mm (approx. 15.75 in). Ends are typically closed and ground for stable seating.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include CNC router Z-axis return mechanisms, robotic arm joint preloading, industrial press tooling, and DIY mechanical linkage assemblies requiring consistent compression spring force over long travel distances.\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 guide rods matching the selected outer diameter. Verify bore\/rod clearance against your chosen variant before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 400mm 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\u003eOuter diameters from 16 mm to 120 mm and wire diameters from 2.3 mm to 22 mm cover a broad spectrum of load and travel requirements in a single product line.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e📐\u003c\/div\u003e\n\u003cstrong\u003e400 mm Free Length\u003c\/strong\u003e\n\u003cp\u003eThe 400 mm (15.75 in) free length provides extended travel stroke, making these springs well-suited for long-travel compression applications in automation and tooling.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔩\u003c\/div\u003e\n\u003cstrong\u003eSpring Steel Construction\u003c\/strong\u003e\n\u003cp\u003eWound from spring steel wire for consistent elastic return, fatigue resistance, and dimensional stability under repeated compression cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🎯\u003c\/div\u003e\n\u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e\n\u003cp\u003eClosed and ground end coils provide flat, stable seating surfaces that reduce lateral deflection and improve alignment on guide rods and spring seats.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e⚡\u003c\/div\u003e\n\u003cstrong\u003eConsistent Load Characteristics\u003c\/strong\u003e\n\u003cp\u003eUniform coil pitch and wire diameter tolerances deliver repeatable spring rates, critical for precision mechanical assemblies and automated systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hdiy-icon\"\u003e🔧\u003c\/div\u003e\n\u003cstrong\u003eMulti-Application Versatility\u003c\/strong\u003e\n\u003cp\u003eApplicable across CNC machines, robotic joints, industrial presses, die sets, and DIY mechanical projects requiring long-stroke compression spring force.\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 Spring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e400 mm (15.75 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e16 mm – 120 mm (0.63 in – 4.72 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWire Diameter Range\u003c\/th\u003e\n\u003ctd\u003e2.3 mm – 22 mm (0.09 in – 0.87 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSpring Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEnd Type\u003c\/th\u003e\n\u003ctd\u003eClosed \u0026amp; Ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoil Direction\u003c\/th\u003e\n\u003ctd\u003eRight-hand (standard)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\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\u003eMax Load Capacity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity per Order\u003c\/th\u003e\n\u003ctd\u003e1 pc (per variant)\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 inner diameter of your spring housing or the outer diameter of your guide rod. The spring's outer diameter should be slightly smaller than the housing bore (typically 1–2 mm clearance) and larger than the guide rod (typically 1–2 mm clearance on each side). Select the variant whose outer diameter fits within those tolerances.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat wire diameter should I select for heavier loads?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eWire diameter directly affects spring rate and load capacity. Larger wire diameters (e.g., 12 mm, 16 mm, 22 mm) produce stiffer springs with higher load ratings, suitable for industrial presses and heavy tooling. Smaller wire diameters (e.g., 2.3 mm, 2.6 mm) are appropriate for lighter-duty return mechanisms and low-load automation fixtures.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these springs corrosion resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese springs are made from spring steel, which offers good mechanical properties but moderate corrosion resistance. For environments with moisture or mild chemical exposure, consider applying a light coat of machine oil or grease after installation. For highly corrosive environments, contact us to confirm suitability.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard spring guide rods and seats?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. The closed and ground ends provide flat seating surfaces compatible with standard spring seats and guide rod assemblies. Verify that your guide rod diameter is smaller than the spring's inner diameter (outer diameter minus twice the wire diameter) to ensure proper fit and prevent binding.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan these springs be used in CNC or robotic automation systems?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes. These 400mm compression springs are well-suited for CNC Z-axis return mechanisms, robotic joint preloading, and automated tooling fixtures. Their consistent coil pitch and spring steel construction support repeatable performance across many compression cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I determine the correct spring for my load and travel requirements?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eStart by identifying your required travel (deflection) and the load at that deflection. Divide the load by the deflection to estimate the required spring rate (N\/mm or lbf\/in). Then select a wire diameter and outer diameter combination that meets that rate. If you need assistance matching specifications, contact us with your load and travel requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between free length and working length?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFree length (400 mm) is the spring's uncompressed length. Working length is the compressed length during operation. The difference between free length and working length is the deflection (travel). Ensure your assembly provides enough space for the full free length and that the spring does not reach solid height (coil bind) during maximum compression.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your wire diameter, outer diameter, and quantity above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"400 mm \/ 2.3 mm \/ 16 mm \u0026 1 pcs","offer_id":52449301889298,"sku":"LXX6DFQ5224x1","price":5.73,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.3 mm \/ 18 mm \u0026 1 pcs","offer_id":52449301922066,"sku":"LXX6DFQ5228x1","price":5.88,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.3 mm \/ 19 mm \u0026 1 pcs","offer_id":52449301954834,"sku":"LXX6DFQ5232x1","price":6.01,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.3 mm \/ 20 mm \u0026 1 pcs","offer_id":52449301987602,"sku":"LXX6DFQ5236x1","price":6.13,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.3 mm \/ 22 mm \u0026 1 pcs","offer_id":52449302020370,"sku":"LXX6DFQ5240x1","price":6.27,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.3 mm \/ 25 mm \u0026 1 pcs","offer_id":52449302053138,"sku":"LXX6DFQ5244x1","price":6.42,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.3 mm \/ 28 mm \u0026 1 pcs","offer_id":52449302085906,"sku":"LXX6DFQ5248x1","price":6.56,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 16 mm \u0026 1 pcs","offer_id":52449302118674,"sku":"LXX6DFQ5618x1","price":6.98,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 18 mm \u0026 1 pcs","offer_id":52449302151442,"sku":"LXX6DFQ5622x1","price":7.26,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 19 mm \u0026 1 pcs","offer_id":52449302184210,"sku":"LXX6DFQ5626x1","price":7.52,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 20 mm \u0026 1 pcs","offer_id":52449302216978,"sku":"LXX6DFQ5630x1","price":7.81,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 22 mm \u0026 1 pcs","offer_id":52449302249746,"sku":"LXX6DFQ5634x1","price":8.08,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 25 mm \u0026 1 pcs","offer_id":52449302282514,"sku":"LXX6DFQ5638x1","price":8.36,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 28 mm \u0026 1 pcs","offer_id":52449302315282,"sku":"LXX6DFQ5642x1","price":8.65,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 2.6 mm \/ 30 mm \u0026 1 pcs","offer_id":52449302348050,"sku":"LXX6DFQ5646x1","price":9.04,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 25 mm \u0026 1 pcs","offer_id":52449302380818,"sku":"LXX6DFQ6414x1","price":10.72,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 28 mm \u0026 1 pcs","offer_id":52449302413586,"sku":"LXX6DFQ6455x1","price":11.27,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 30 mm \u0026 1 pcs","offer_id":52449302446354,"sku":"LXX6DFQ6484x1","price":11.82,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 32 mm \u0026 1 pcs","offer_id":52449302479122,"sku":"LXX6DFQ6501x1","price":12.39,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 35 mm \u0026 1 pcs","offer_id":52449302511890,"sku":"LXX6DFQ6530x1","price":13.21,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 38 mm \u0026 1 pcs","offer_id":52449302544658,"sku":"LXX6DFQ6559x1","price":14.04,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 40 mm \u0026 1 pcs","offer_id":52449302577426,"sku":"LXX6DFQ6576x1","price":14.88,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 45 mm \u0026 1 pcs","offer_id":52449302610194,"sku":"LXX6DFQ6609x1","price":16.54,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 4 mm \/ 50 mm \u0026 1 pcs","offer_id":52449302642962,"sku":"LXX6DFQ6636x1","price":18.2,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 12 mm \/ 77 mm \u0026 1 pcs","offer_id":52449302675730,"sku":"LXX6DFQ29617x1","price":35.78,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 16 mm \/ 100 mm \u0026 1 pcs","offer_id":52449302708498,"sku":"LXX6DFQ29643x1","price":46.25,"currency_code":"USD","in_stock":true},{"title":"400 mm \/ 22 mm \/ 120 mm \u0026 1 pcs","offer_id":52449302741266,"sku":"LXX6DFQ29656x1","price":76.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture_9_of_11_3dd15932-d58d-4af0-a8d9-289a2db7bf95.jpg?v=1783523582","url":"https:\/\/homediyer.com\/products\/400mm-long-compression-spring-16mm-120mm-diameter-pressure-coiled-springs","provider":"HomeDIYer","version":"1.0","type":"link"}