{"product_id":"black-big-compression-springs-spring-steel-o1-5-6mm-wire-od8-50mm-long-110-400mm","title":"Black Big Compression Springs Spring Steel Ø1.5-6mm Wire,OD8-50mm,Long 110~400mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eBlack Compression Springs — Heavy-Duty Spring Steel for Industrial \u0026amp; DIY Use\u003c\/h2\u003e\n    \u003cp\u003eWhen a standard spring fails under load or corrodes after a season outdoors, the whole assembly suffers. Engineers, machinists, and serious DIYers who need reliable black compression springs turn to a solution that holds its rate under repeated cycling without visible rust creep. These black oxide compression springs are built for exactly that — consistent force delivery in demanding environments where a flimsy spring is not an option.\u003c\/p\u003e\n    \u003cp\u003eEach spring is formed from spring steel wire with diameters ranging from Ø1.5 mm to Ø6 mm (approx. 0.059 in to 0.236 in). Outer diameters span 8 mm to 50 mm (approx. 0.31 in to 1.97 in), and free lengths run from 110 mm to 400 mm (approx. 4.3 in to 15.7 in). The black oxide surface treatment provides a uniform matte finish that reduces surface friction and offers a baseline level of corrosion inhibition compared to bare steel.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include industrial machinery return mechanisms, automotive suspension jigs and fixture clamps, heavy-duty drawer and cabinet hardware, robotic actuator assemblies, and custom DIY press or tensioning rigs where a specific spring rate and free length must be matched precisely.\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 seats, guide rods, and bores sized to match the selected outer diameter. Verify inner diameter clearance against your guide rod before ordering.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These 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 — Formed from carbon spring steel for consistent elastic return and resistance to permanent set under rated load.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🖤\u003c\/span\u003e\u003cstrong\u003eBlack Oxide Surface Finish\u003c\/strong\u003e — Uniform matte black coating reduces surface friction, minimises light reflection, and provides baseline corrosion inhibition versus bare steel.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e — Wire diameters Ø1.5–6 mm, outer diameters 8–50 mm, and free lengths 110–400 mm cover a broad range of engineering and DIY applications in a single product family.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e — Flat ground ends ensure square seating on spring plates, reducing lateral deflection and improving load distribution across the coil body.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eConsistent Spring Rate\u003c\/strong\u003e — Uniform coil pitch across the active coils delivers a linear force-deflection curve, making these springs predictable in load-critical assemblies.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eVersatile Application Range\u003c\/strong\u003e — Suited for industrial machinery, automotive jigs, robotics, press tooling, cabinet hardware, and custom fabrication projects requiring a specific free length and OD.\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eCarbon Spring Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eBlack Oxide\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003eØ1.5 mm – Ø6 mm (0.059 in – 0.236 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e8 mm – 50 mm (0.31 in – 1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e110 mm – 400 mm (4.3 in – 15.7 in)\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\u003eLoad Capacity\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\u003e1 piece per variant\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      \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\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\u003eStart with the bore or housing diameter your spring must fit inside — the spring OD should be 0.5–1 mm smaller than the bore for clearance. Then select a wire diameter that delivers the spring rate you need: thicker wire (e.g. Ø4–6 mm) produces a stiffer spring, while thinner wire (e.g. Ø1.5–2 mm) gives a softer rate. Use the variant selector above to match both dimensions to your design.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow strong are these compression springs under repeated cycling?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese springs are formed from carbon spring steel, which is engineered for elastic deformation — meaning the coils return to their original free length after each compression cycle. Fatigue life depends on the deflection ratio (how far you compress relative to free length); keeping deflection below 80% of the solid height significantly extends service life in high-cycle applications.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eDoes the black oxide finish protect against rust and corrosion?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBlack oxide provides a baseline level of corrosion inhibition compared to bare steel by converting the surface layer to magnetite. It is not equivalent to zinc plating or stainless steel in wet or salt-spray environments. For outdoor or high-humidity use, we recommend applying a light coat of oil or grease after installation to extend service life.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these springs compatible with a guide rod or mandrel?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — the inner diameter (ID) of each spring is approximately OD minus twice the wire diameter. For example, a spring with OD 25 mm and wire Ø2 mm has an ID of roughly 21 mm. Ensure your guide rod diameter is at least 0.5 mm smaller than the ID to allow free travel without binding. Check the variant dimensions before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these springs in automotive or machinery applications?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These black compression springs are commonly used in automotive jig fixtures, press tooling, valve return mechanisms, and industrial machinery where a specific free length and OD must be matched. Always verify the spring rate and solid height against your load and travel requirements before installation in safety-critical assemblies.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 305 mm, 400 mm, 110 mm, 120 mm, 130 mm, and 150 mm length options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe length listed is the free length — the uncompressed length of the spring. Choose a free length that gives you adequate travel (compression distance) for your application. A longer free length allows more total deflection before reaching solid height. Select the length that fits your housing depth and required stroke in the variant selector above.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I calculate the spring rate I need?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring rate (k) = Load (N) ÷ Deflection (mm). If you need to support 50 N over 10 mm of travel, you need a spring rate of 5 N\/mm. Spring rate increases with wire diameter and decreases with more active coils or a larger OD. If you need help matching a specific rate, contact us with your load and travel requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-cta\"\u003e\n    🛒 Select your Wire Dia, Outer Diameter, and Length 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\": \"Start with the bore or housing diameter your spring must fit inside — the spring OD should be 0.5–1 mm smaller than the bore for clearance. Then select a wire diameter that delivers the spring rate you need: thicker wire (e.g. Ø4–6 mm) produces a stiffer spring, while thinner wire (e.g. Ø1.5–2 mm) gives a softer rate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these compression springs under repeated cycling?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These springs are formed from carbon spring steel engineered for elastic deformation. Fatigue life depends on the deflection ratio; keeping deflection below 80% of the solid height significantly extends service life in high-cycle applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the black oxide finish protect against rust and corrosion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black oxide provides a baseline level of corrosion inhibition compared to bare steel. It is not equivalent to zinc plating or stainless steel in wet environments. Apply a light coat of oil or grease after installation for extended service life.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs compatible with a guide rod or mandrel?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The inner diameter is approximately OD minus twice the wire diameter. Ensure your guide rod is at least 0.5 mm smaller than the ID to allow free travel without binding.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these springs in automotive or machinery applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These black compression springs are commonly used in automotive jig fixtures, press tooling, valve return mechanisms, and industrial machinery. Always verify the spring rate and solid height against your load and travel requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 305 mm, 400 mm, 110 mm, 120 mm, 130 mm, and 150 mm length options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The length listed is the free length — the uncompressed length of the spring. Choose a free length that gives you adequate travel for your application. A longer free length allows more total deflection before reaching solid height.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I calculate the spring rate I need?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring rate (k) = Load (N) ÷ Deflection (mm). If you need to support 50 N over 10 mm of travel, you need a spring rate of 5 N\/mm. Spring rate increases with wire diameter and decreases with more active coils or a larger OD.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"1.6 \/ 8 \/ 305 \u0026 1","offer_id":52447656640786,"sku":"PFQGLBZSJ049900x1","price":2.84,"currency_code":"USD","in_stock":true},{"title":"1.6 \/ 10 \/ 305 \u0026 1","offer_id":52447656673554,"sku":"PFQGLBZSJ049901x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"1.6 \/ 12 \/ 305 \u0026 1","offer_id":52447656706322,"sku":"PFQGLBZSJ049902x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"1.6 \/ 13 \/ 305 \u0026 1","offer_id":52447656739090,"sku":"PFQGLBZSJ049903x1","price":2.79,"currency_code":"USD","in_stock":true},{"title":"1.6 \/ 16 \/ 305 \u0026 1","offer_id":52447656771858,"sku":"PFQGLBZSJ049904x1","price":2.98,"currency_code":"USD","in_stock":true},{"title":"1.8 \/ 10 \/ 305 \u0026 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