{"product_id":"compression-spring-30-40mm-diameter-20-100mm-length-3mm-wire-dia","title":"Compression Spring 30-40mm Diameter \u0026 20-100mm Length Pressure Big 3mm Wire Dia","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCompression Spring 3mm Wire Dia — Reliable Elastic Force for Demanding Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a mechanism fails because a spring loses tension too quickly or deforms under repeated load, the root cause is almost always undersized wire diameter. Engineers, robotics builders, and hands-on DIYers who need consistent return force across thousands of cycles will find these compression springs — with a robust 3mm wire diameter — engineered to hold their shape and deliver repeatable performance in demanding assemblies.\u003c\/p\u003e\n\u003cp\u003eEach spring is manufactured from spring steel wire with a wire diameter of 3mm (0.118 in). Outer diameters span 30–40mm (1.18–1.57 in) and free lengths range from 20–100mm (0.79–3.94 in), covering a wide range of cavity depths. Ends are closed and ground for stable seating on flat surfaces.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include industrial machinery damping, robotic joint return mechanisms, automotive jig fixtures, and heavy-duty DIY press or clamp builds where a compression spring 30mm OD or compression spring 40mm OD with long service life is required.\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 spring housings and bores sized to accept 30–40mm outer diameter springs. Verify free length and spring rate against your application load requirements before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These Compression Springs 3mm Wire Dia\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n  \u003cdiv\u003e\n    \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n    \u003cstrong\u003eHeavy-Duty 3mm Wire Diameter\u003c\/strong\u003e\n    \u003cp\u003eThe 3mm wire cross-section delivers significantly higher spring rates than lighter-gauge alternatives, resisting permanent set under sustained compressive loads.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv\u003e\n    \u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n    \u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e\n    \u003cp\u003eOuter diameters from 30mm to 40mm (1.18–1.57 in) paired with free lengths from 20mm to 100mm (0.79–3.94 in) — select the exact geometry your assembly requires.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv\u003e\n    \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n    \u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e\n    \u003cp\u003eGround flat ends ensure perpendicular seating, minimizing lateral deflection and extending the working life of both the spring and its housing.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv\u003e\n    \u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n    \u003cstrong\u003eSpring Steel Construction\u003c\/strong\u003e\n    \u003cp\u003eMade from spring steel wire for consistent elastic modulus, fatigue resistance, and dimensional stability across repeated compression cycles.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv\u003e\n    \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n    \u003cstrong\u003eSold in 2-Piece Packs\u003c\/strong\u003e\n    \u003cp\u003eEach order ships as a matched pair — convenient for symmetric assemblies, replacements, or keeping a spare on hand without over-ordering.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv\u003e\n    \u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\n    \u003cstrong\u003eBroad Application Range\u003c\/strong\u003e\n    \u003cp\u003eSuited for industrial machinery, robotics, automotive jigs, hydraulic valve returns, and heavy-duty DIY clamp or press builds requiring a reliable compression spring 3mm wire dia.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003e📐 Technical Specifications — Compression Spring\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n  \u003ctable\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n\u003cth\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e3mm (0.118 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e30–40mm (1.18–1.57 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr\u003e\n\u003cth\u003eFree Length Range\u003c\/th\u003e\n\u003ctd\u003e20–100mm (0.79–3.94 in)\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\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eSpring Steel\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\u003eSpring Rate\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003e2 Pcs per pack\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 outer diameter for my application?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the inner diameter of the housing or bore where the spring will sit. The spring's outer diameter should be 1–2mm smaller than the bore to allow free movement without binding. For a shaft-guided setup, the spring's inner diameter must clear the shaft by at least 1mm. Use the Size selector above to match your required OD (30, 32, 34, 35, 36, 38, or 40mm).\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eWhat free length should I select?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFree length is the uncompressed length of the spring. Choose a free length that, when compressed to your working height, still leaves the spring above its solid height. As a general rule, working deflection should not exceed 80% of the difference between free length and solid height. Available lengths range from 20mm to 100mm — select via the Size option above.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eHow strong are these springs compared to lighter wire gauges?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA 3mm wire diameter produces a substantially higher spring rate than 1–2mm wire springs of the same OD and length. This makes them well-suited for applications requiring firm return force, such as industrial press platens, heavy valve returns, or robotic joint mechanisms. If your application requires a softer, more compliant spring, consider a lighter wire gauge.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eAre these springs corrosion-resistant?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese springs are manufactured from spring steel, which offers good mechanical properties but moderate corrosion resistance in dry or mildly humid environments. For outdoor, wet, or chemically aggressive environments, consider applying a protective coating (e.g., zinc plating or oil) after installation, or contact us to confirm finish options for your specific size.\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. The 3mm wire diameter and closed-ground ends make these springs suitable for automotive jig fixtures, machinery damping, hydraulic valve returns, and similar industrial uses. 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\u003eWhy are springs sold in 2-piece packs?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMany assemblies use springs in symmetric pairs (e.g., both sides of a press platen or dual-return mechanisms). Selling in 2-piece packs ensures you receive a matched set in one order, reducing the risk of mismatched dimensions from separate purchases. If you need larger quantities, simply adjust the quantity at checkout.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n  \u003csummary\u003eHow do I confirm the spring rate before purchasing?\u003c\/summary\u003e\n  \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring rate depends on wire diameter, outer diameter, free length, and number of active coils. Because coil count varies by size, exact spring rates are not listed universally across all variants. If you need a specific spring rate for an engineering application, please contact us with your size selection and load requirements and we will provide confirmation.\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 Size and Packing 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 outer diameter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the inner diameter of the housing or bore where the spring will sit. The spring's outer diameter should be 1–2mm smaller than the bore to allow free movement without binding. For a shaft-guided setup, the spring's inner diameter must clear the shaft by at least 1mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What free length should I select?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Free length is the uncompressed length of the spring. Choose a free length that, when compressed to your working height, still leaves the spring above its solid height. Working deflection should not exceed 80% of the difference between free length and solid height.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these springs compared to lighter wire gauges?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A 3mm wire diameter produces a substantially higher spring rate than 1–2mm wire springs of the same OD and length, making them well-suited for industrial press platens, heavy valve returns, or robotic joint mechanisms.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These springs are manufactured from spring steel, which offers good mechanical properties but moderate corrosion resistance in dry or mildly humid environments. For outdoor or wet environments, consider applying a protective coating after installation.\"\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. The 3mm wire diameter and closed-ground ends make these springs suitable for automotive jig fixtures, machinery damping, hydraulic valve returns, and similar industrial uses.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why are springs sold in 2-piece packs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Many assemblies use springs in symmetric pairs. Selling in 2-piece packs ensures you receive a matched set in one order, reducing the risk of mismatched dimensions from separate purchases.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I confirm the spring rate before purchasing?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring rate depends on wire diameter, outer diameter, free length, and number of active coils. If you need a specific spring rate for an engineering application, please contact us with your size selection and load requirements.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3x30x30mm \/ 2 Pcs","offer_id":52450544025874,"sku":"GLFBQKGLBZSJ049771x2","price":4.07,"currency_code":"USD","in_stock":true},{"title":"3x30x35mm \/ 2 Pcs","offer_id":52450544058642,"sku":"GLFBQKGLBZSJ049772x2","price":4.2,"currency_code":"USD","in_stock":true},{"title":"3x30x40mm \/ 2 Pcs","offer_id":52450544091410,"sku":"GLFBQKGLBZSJ049773x2","price":4.34,"currency_code":"USD","in_stock":true},{"title":"3x30x45mm \/ 2 Pcs","offer_id":52450544124178,"sku":"GLFBQKGLBZSJ049774x2","price":4.47,"currency_code":"USD","in_stock":true},{"title":"3x30x50mm \/ 2 Pcs","offer_id":52450544156946,"sku":"GLFBQKGLBZSJ049775x2","price":5.37,"currency_code":"USD","in_stock":true},{"title":"3x30x60mm \/ 2 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