{"product_id":"400mm-compression-spring-black-spring-steel-all-sizes","title":"400mm Druckfeden Federstahl Rückstellfedern Compression Spring -Schwarz ALL SIZE","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e400mm Black Compression Springs — Precision Spring Steel for DIY \u0026amp; Industrial Use\u003c\/h2\u003e\n\u003cp\u003eWhen a worn-out spring causes equipment downtime or a DIY project stalls because you can't find the right size, the frustration is real. Engineers, mechanics, and hands-on makers who need a reliable 400mm compression spring in a specific wire and outer diameter will find exactly what they need here — available in multiple wire-to-outer-diameter combinations and selectable quantities.\u003c\/p\u003e\n\u003cp\u003eThese compression springs are manufactured from spring steel (65Mn grade, typically used for high-elasticity applications), finished in black surface treatment for corrosion resistance. The fixed body length is 400mm (~15.75 in). Wire diameters range from 2.3mm to 4mm (~0.091–0.157 in), and outer diameters span 16mm to 38mm (~0.63–1.50 in), covering a wide range of bore and housing fits.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include: replacing return springs in industrial presses and stamping fixtures, restoring tension in custom jigs and clamping devices, and sourcing exact-spec springs for 400mm compression spring DIY automation builds, robotics frames, and mechanical linkage assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Suitable for standard spring housings and bores matching the selected outer diameter. Verify wire Ø × outer Ø against your application before ordering. See variant options for full size matrix.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 400mm Black Compression Springs\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSpring Steel Construction\u003c\/strong\u003e — Made from 65Mn spring steel for consistent elasticity, fatigue resistance, and reliable return force across repeated compression cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e400mm Fixed Body Length\u003c\/strong\u003e — Standardized 400mm (~15.75 in) length suits long-stroke applications in presses, automation rigs, and custom mechanical assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003e11 Wire × Outer Diameter Combinations\u003c\/strong\u003e — From 2.3mm×16mm to 4mm×38mm, covering light-duty to medium-heavy load requirements without custom fabrication.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eBlack Surface Finish\u003c\/strong\u003e — Protective black coating reduces surface oxidation and provides a clean, workshop-ready appearance suitable for exposed mechanical assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Options\u003c\/strong\u003e — Order 1 to 5 springs per variant to match project scale — from single-unit repairs to multi-spring fixture builds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eConsistent Coil Pitch \u0026amp; Squareness\u003c\/strong\u003e — Ground or closely wound ends (typical for this spring class) ensure stable seating and even load distribution in spring housings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Compression Springs\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Length\u003c\/th\u003e\n\u003ctd\u003e400mm (~15.75 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWire Diameter Range\u003c\/th\u003e\n\u003ctd\u003e2.3mm – 4mm (0.091 – 0.157 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e16mm – 38mm (0.63 – 1.50 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSpring Steel (65Mn)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCompression (return \/ push)\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\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e400mm (nominal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLoad Capacity\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 Order\u003c\/th\u003e\n\u003ctd\u003e1 \/ 2 \/ 3 \/ 4 \/ 5 pcs (selectable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\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 wire diameter and outer diameter for my application?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the outer diameter to your spring housing bore (the spring OD should be slightly smaller than the bore ID). Then select the wire diameter based on the load you need — a thicker wire (e.g., 4mm) provides a stiffer spring with higher load capacity, while a thinner wire (e.g., 2.3mm) gives a softer, lighter-duty spring. If you have an existing spring to replace, measure its wire Ø and outer Ø directly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the strength and load capacity of these compression springs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eLoad capacity varies by wire diameter and outer diameter combination. Heavier wire gauges (3mm–4mm) and larger outer diameters support significantly higher loads. For precise spring rate and load data for your selected variant, please contact us to confirm — we can provide technical data sheets for specific size combinations.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these springs corrosion-resistant? Can they be used outdoors or in humid environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe black surface coating provides a basic level of oxidation resistance suitable for indoor and semi-protected environments. For prolonged outdoor exposure or high-humidity applications, we recommend applying a light machine oil or grease to the spring surface. These springs are not rated for fully submerged or highly corrosive chemical environments.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these 400mm compression springs compatible with standard spring housings?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — as long as the outer diameter of the spring you select is slightly smaller than your housing bore ID, and the wire diameter matches your load requirements, these springs will seat correctly in standard cylindrical spring housings, guide rods, and bores. Always verify the OD and wire Ø against your housing dimensions before ordering.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these springs for a DIY automation or robotics project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eAbsolutely. The 400mm body length and wide range of wire-to-outer-diameter options make these springs well-suited for custom automation frames, robotic return mechanisms, clamping jigs, and linear actuator assemblies. Select the wire Ø × outer Ø combination that matches your stroke length and force requirements.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat quantity should I order — single or multi-pack?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor single repairs or prototyping, ordering 1 or 2 springs is sufficient. For production fixtures, multi-spring assemblies, or projects requiring matched spring sets, ordering 3–5 ensures you have spares and consistent spring rates across all positions. Multi-packs are priced to offer better value per spring.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 2.3mm and 4mm wire diameter options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 2.3mm wire diameter produces a lighter, more flexible spring with lower spring rate — ideal for light return mechanisms, panel latches, or low-load applications. The 4mm wire diameter produces a stiffer spring with a higher spring rate and load capacity, suited for heavier clamping, pressing, or industrial return applications. Choose based on the force your application requires.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your Wire Ø × Outer Ø and quantity above, then add to cart.\n\u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right wire diameter and outer diameter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the outer diameter to your spring housing bore (the spring OD should be slightly smaller than the bore ID). Then select the wire diameter based on the load you need — a thicker wire (e.g., 4mm) provides a stiffer spring with higher load capacity, while a thinner wire (e.g., 2.3mm) gives a softer, lighter-duty spring. If you have an existing spring to replace, measure its wire Ø and outer Ø directly.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the strength and load capacity of these compression springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Load capacity varies by wire diameter and outer diameter combination. Heavier wire gauges (3mm–4mm) and larger outer diameters support significantly higher loads. For precise spring rate and load data for your selected variant, please contact us to confirm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs corrosion-resistant? Can they be used outdoors or in humid environments?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The black surface coating provides a basic level of oxidation resistance suitable for indoor and semi-protected environments. For prolonged outdoor exposure or high-humidity applications, we recommend applying a light machine oil or grease to the spring surface.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these 400mm compression springs compatible with standard spring housings?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — as long as the outer diameter of the spring you select is slightly smaller than your housing bore ID, and the wire diameter matches your load requirements, these springs will seat correctly in standard cylindrical spring housings, guide rods, and bores.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these springs for a DIY automation or robotics project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Absolutely. The 400mm body length and wide range of wire-to-outer-diameter options make these springs well-suited for custom automation frames, robotic return mechanisms, clamping jigs, and linear actuator assemblies.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What quantity should I order — single or multi-pack?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For single repairs or prototyping, ordering 1 or 2 springs is sufficient. For production fixtures, multi-spring assemblies, or projects requiring matched spring sets, ordering 3–5 ensures you have spares and consistent spring rates across all positions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 2.3mm and 4mm wire diameter options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 2.3mm wire diameter produces a lighter, more flexible spring with lower spring rate — ideal for light return mechanisms, panel latches, or low-load applications. The 4mm wire diameter produces a stiffer spring with a higher spring rate and load capacity, suited for heavier clamping, pressing, or industrial return applications.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"400mm \/ 2.3mm*16mm \/ 1","offer_id":52448719864082,"sku":"CXHOOE2426x1","price":7.55,"currency_code":"USD","in_stock":true},{"title":"400mm \/ 2.3mm*16mm \/ 2","offer_id":52448719896850,"sku":"CXHOOE2426x2","price":13.99,"currency_code":"USD","in_stock":true},{"title":"400mm \/ 2.3mm*16mm \/ 3","offer_id":52448719929618,"sku":"CXHOOE2426x3","price":20.39,"currency_code":"USD","in_stock":true},{"title":"400mm \/ 2.3mm*16mm \/ 4","offer_id":52448719962386,"sku":"CXHOOE2426x4","price":26.91,"currency_code":"USD","in_stock":true},{"title":"400mm \/ 2.3mm*16mm \/ 5","offer_id":52448719995154,"sku":"CXHOOE2426x5","price":27.54,"currency_code":"USD","in_stock":true},{"title":"400mm \/ 2.3mm*19mm \/ 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