{"product_id":"long-305mm-high-carbon-steel-compression-spring-wire-diameter-0-3-2mm-od-3-28mm","title":"Long 305mm High Carbon Steel Compression Spring Wire Diameter 0.3-2mm OD 3-28mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eLong 305mm Compression Springs — Precision High Carbon Steel for Demanding DIY \u0026amp; Mechanical Applications\u003c\/h2\u003e\n    \u003cp\u003eWhen your project demands a reliable, consistent return force over a long stroke, standard short springs simply fall short. Engineers, robotics builders, and hands-on DIYers working on actuators, jigs, clamps, and custom mechanisms need a compression spring that holds its geometry across the full 305mm length without fatigue or set. These long 305mm high carbon steel compression springs are engineered for exactly that use case.\u003c\/p\u003e\n    \u003cp\u003eEach spring is formed from high carbon steel wire, offering a strong balance of tensile strength and elastic recovery. Wire diameters range from 0.3mm to 2mm (approximately 0.012 in to 0.079 in), with outer diameters spanning 3mm to 28mm (approximately 0.12 in to 1.10 in) and a fixed free length of 305mm (approximately 12.0 in). The close-wound or open-pitch coil geometry is consistent across the full length, ensuring predictable spring rate behavior.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include long-travel return mechanisms in robotics and automation assemblies, tension-balancing in custom jig and fixture designs, and replacement or prototype springs for industrial equipment, 3D printer Z-axis systems, and DIY pneumatic or mechanical actuators requiring a long compression spring with precise wire-to-OD ratios.\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    Compatible with robotics frames, automation fixtures, 3D printer assemblies, custom jigs, and general mechanical DIY applications requiring a 305mm free-length compression spring.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"hdiy-features\"\u003e\n    \u003ch2\u003e✅ Key Features of These Long 305mm Compression Springs\u003c\/h2\u003e\n    \u003cul class=\"hdiy-list\"\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n        \u003cstrong\u003eFixed 305mm Free Length\u003c\/strong\u003e — Consistent 305mm (≈12.0 in) free length across all variants, enabling long-stroke compression travel in actuators, clamps, and return mechanisms.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n        \u003cstrong\u003eWide Size Range\u003c\/strong\u003e — Wire diameters from 0.3mm to 2mm and OD from 3mm to 28mm let you match the exact spring rate and fit required by your design without custom fabrication.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🏗️\u003c\/span\u003e\n        \u003cstrong\u003eHigh Carbon Steel Construction\u003c\/strong\u003e — Formed from high carbon steel wire for strong elastic recovery, resistance to permanent set under repeated cycling, and reliable mechanical performance.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n        \u003cstrong\u003eConsistent Coil Geometry\u003c\/strong\u003e — Uniform pitch and coil diameter maintained along the full 305mm length, ensuring a linear and predictable spring rate throughout the compression stroke.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n        \u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e — Available in 3-piece or 5-piece packs depending on size, so you can stock spares or prototype multiple configurations without over-ordering.\n      \u003c\/li\u003e\n      \u003cli\u003e\n        \u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\n        \u003cstrong\u003eBroad Application Fit\u003c\/strong\u003e — Suited for robotics, automation, 3D printer Z-axis assemblies, custom jigs, mechanical actuators, and any DIY project requiring a long compression spring with a defined wire-to-OD ratio.\n      \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 Spring\u003c\/h2\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eHigh Carbon Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e305mm (≈12.0 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWire Diameter Range\u003c\/th\u003e\n\u003ctd\u003e0.3mm – 2.0mm (≈0.012 in – 0.079 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e3mm – 28mm (≈0.12 in – 1.10 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCompression\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\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\u003eEnd Type\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e3 Pcs or 5 Pcs (see variant options)\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 OD for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect wire diameter based on the load your spring must support — thicker wire (e.g., 1.5mm–2mm) handles heavier loads, while thinner wire (0.3mm–0.8mm) suits lighter return-force applications. The outer diameter must fit inside your housing or guide rod bore with clearance. A common rule is to allow at least 0.5mm–1mm clearance between the OD and the bore. Check the variant options table for the exact Wire Diameter × OD × Length combination that matches your design.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the spring rate of these 305mm compression springs?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring rate varies by wire diameter and OD combination. Thicker wire and smaller OD generally produce a stiffer spring (higher rate), while thinner wire and larger OD produce a softer spring. Exact spring rate values depend on the specific variant. If you need a calculated spring rate for your design, please contact us with your selected variant dimensions and we can assist.\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 made from high carbon steel, which provides strong mechanical performance but has limited inherent corrosion resistance compared to stainless steel. For indoor, dry, or controlled-environment applications they perform reliably. For outdoor or high-humidity environments, consider applying a light protective coating or lubricant, or contact us to confirm if a coated variant is available for your size.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eCan I use these springs in a 3D printer Z-axis or bed-leveling system?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 305mm free length and the range of OD options (3mm–28mm) make these springs well-suited for 3D printer Z-axis return mechanisms and bed-leveling assemblies where a long, consistent spring is needed. Select a wire diameter and OD that matches your printer's guide rod diameter and the preload force required by your bed weight.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eAre these springs compatible with standard guide rods or shafts?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes, provided the inner diameter (ID = OD minus 2× wire diameter) is larger than your guide rod or shaft diameter. For example, a 1mm wire × 10mm OD spring has an approximate ID of 8mm, suitable for a guide rod up to about 7–7.5mm. Always verify the ID calculation for your chosen variant before ordering.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the difference between the 3-piece and 5-piece pack options?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSmaller wire diameter variants (typically 0.3mm–1mm wire) are available in 5-piece packs, while larger wire diameter variants (typically 1mm–2mm wire) are offered in 3-piece packs. The pack size is shown in the QTY variant selector. Choose based on how many springs your project requires or how many spares you want to keep on hand.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I measure whether a compression spring has taken a permanent set?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the free length of the spring when fully unloaded. If the free length has decreased from the original 305mm after use, the spring has taken a permanent set — meaning it has been compressed beyond its elastic limit. To avoid this, ensure the maximum compressed length in your application does not exceed the spring's solid height (coil count × wire diameter). If you need help calculating solid height for a specific variant, contact us.\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 Diameter × OD and QTY 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 OD for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select wire diameter based on the load your spring must support. Thicker wire handles heavier loads, while thinner wire suits lighter return-force applications. The outer diameter must fit inside your housing or guide rod bore with clearance. Check the variant options for the exact Wire Diameter x OD x Length combination that matches your design.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the spring rate of these 305mm compression springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring rate varies by wire diameter and OD combination. Thicker wire and smaller OD generally produce a stiffer spring, while thinner wire and larger OD produce a softer spring. Contact us with your selected variant dimensions for a calculated spring rate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs corrosion-resistant?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These springs are made from high carbon steel, which provides strong mechanical performance but has limited inherent corrosion resistance. For indoor or dry environments they perform reliably. For outdoor or high-humidity use, consider applying a protective coating or lubricant.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these springs in a 3D printer Z-axis or bed-leveling system?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 305mm free length and OD range of 3mm to 28mm make these springs well-suited for 3D printer Z-axis return mechanisms and bed-leveling assemblies. Select a wire diameter and OD that matches your printer's guide rod diameter and required preload force.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these springs compatible with standard guide rods or shafts?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, provided the inner diameter (OD minus 2x wire diameter) is larger than your guide rod diameter. Always verify the ID calculation for your chosen variant before ordering.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 3-piece and 5-piece pack options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Smaller wire diameter variants are typically available in 5-piece packs, while larger wire diameter variants come in 3-piece packs. The pack size is shown in the QTY variant selector.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I measure whether a compression spring has taken a permanent set?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the free length when fully unloaded. If it has decreased from the original 305mm after use, the spring has taken a permanent set. Ensure the maximum compressed length in your application does not exceed the spring's solid height (coil count x wire diameter).\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"0.3*3*305mm \/ 5 Pcs","offer_id":52450347385106,"sku":"GLFBZBP2024KC01640x5","price":4.01,"currency_code":"USD","in_stock":true},{"title":"0.4*4*305mm \/ 5 Pcs","offer_id":52450347417874,"sku":"GLFBZBP2024KC01641x5","price":4.09,"currency_code":"USD","in_stock":true},{"title":"0.4*5*305mm \/ 5 Pcs","offer_id":52450347450642,"sku":"GLFBZBP2024KC01642x5","price":4.18,"currency_code":"USD","in_stock":true},{"title":"0.5*3*305mm \/ 5 Pcs","offer_id":52450347483410,"sku":"GLFBZBP2024KC01643x5","price":4.01,"currency_code":"USD","in_stock":true},{"title":"0.5*3.5*305mm \/ 5 Pcs","offer_id":52450347516178,"sku":"GLFBZBP2024KC01644x5","price":4.01,"currency_code":"USD","in_stock":true},{"title":"0.5*4*305mm \/ 5 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