{"product_id":"compression-spring-3-5mm-wire-dia-spring-steel-pressure-coil-springs-od-20-50mm","title":"Compression Spring 3.5mm Wire Dia Spring Steel Pressure\/Coil Springs OD 20-50mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCompression Spring 3.5mm Wire Dia — Reliable Coil Springs for DIY Machines \u0026amp; Automation\u003c\/h2\u003e\n\u003cp\u003eWhen a loose mechanism, a rattling fixture, or an under-tensioned jig brings your project to a halt, the right compression spring makes all the difference. These 3.5mm wire diameter coil springs are engineered for makers, small-workshop builders, and automation hobbyists who need consistent, repeatable spring force without sourcing from industrial suppliers.\u003c\/p\u003e\n\u003cp\u003eEach spring is formed from spring steel wire with a nominal wire diameter of 3.5mm (approximately 0.138 in). Outer diameters span 20–50mm (roughly 0.79–1.97 in), and body lengths range from 60mm to 305mm (2.36–12.01 in), giving you a broad selection matrix to match your exact application. Ends are closed and ground for stable seating on flat surfaces.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include return-force mechanisms in DIY press jigs, tension-balancing in 3D-printer Z-axis assemblies, buffer springs in light conveyor systems, and load-bearing coil springs in custom automation fixtures — all scenarios where a 3.5mm wire compression spring with a defined outer diameter delivers measurable, repeatable performance.\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-loaded fixtures, DIY press tools, automation jigs, conveyor buffers, and mechanical assemblies requiring a closed-end ground compression spring with 3.5mm wire diameter. Verify inner bore clearance and free length against your design before ordering.\n\u003c\/div\u003e\n\n\u003ch2\u003e✅ Key Features of These 3.5mm Wire Compression Springs\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\n\u003cstrong\u003e3.5mm Wire Diameter\u003c\/strong\u003e\n\u003cp\u003eConsistent 3.5mm (0.138 in) wire cross-section across all variants for predictable spring-rate calculations in your design.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\n\u003cstrong\u003eWide OD Range: 20–50mm\u003c\/strong\u003e\n\u003cp\u003eThirteen outer diameter options from 20mm to 50mm (0.79–1.97 in) let you match bore or housing dimensions precisely.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\n\u003cstrong\u003eMultiple Free Lengths: 60–305mm\u003c\/strong\u003e\n\u003cp\u003eTen length options from 60mm to 305mm (2.36–12.01 in) cover short-stroke return springs through long-travel buffer applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\n\u003cstrong\u003eSpring Steel Construction\u003c\/strong\u003e\n\u003cp\u003eFormed from spring steel for strong elastic recovery and resistance to fatigue under repeated compression cycles in mechanical assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\n\u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e\n\u003cp\u003eClosed and ground end coils provide a flat, stable seating surface, reducing lateral deflection and improving load alignment in your fixture.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\n\u003cstrong\u003eFlexible Pack Quantities\u003c\/strong\u003e\n\u003cp\u003eAvailable in 1, 2, or 5-piece packs depending on the variant — order exactly what your project needs without excess stock.\u003c\/p\u003e\n\u003c\/div\u003e\n\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\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e3.5mm (0.138 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e20mm – 50mm (0.79 – 1.97 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e60mm – 305mm (2.36 – 12.01 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\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCompression (Coil \/ Pressure)\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\u003ePack Quantity\u003c\/th\u003e\n\u003ctd\u003e1 PCS \/ 2 PCS \/ 5 PCS (varies by variant)\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 bore or housing your spring will sit inside, then select an OD that provides a small clearance — typically 1–2mm smaller than the bore. For a guide rod application, measure the rod diameter and choose an inner diameter (OD minus two wire diameters) that clears the rod with 0.5–1mm of play. This product offers ODs from 20mm to 50mm to cover a wide range of fixture sizes.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat free length should I select for my design?\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 (coils fully closed). As a starting point, your working deflection should not exceed 70–80% of the free length. Available lengths here range from 60mm to 305mm to suit short-stroke and long-travel applications alike.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow strong are these compression springs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring force depends on the wire diameter, OD, free length, and number of active coils — all of which interact. With a 3.5mm wire diameter, these springs are suited for moderate-to-heavy-duty DIY and light industrial applications. For precise load requirements, use the spring rate formula (G × d⁴) \/ (8 × D³ × n) or contact us with your target load and deflection so we can confirm suitability.\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 spring steel, which offers good mechanical properties but has moderate corrosion resistance in dry indoor environments. For outdoor, humid, or chemically exposed applications, consider applying a light coat of corrosion-inhibiting oil or grease, or contact us to ask about surface-treated options. Avoid prolonged exposure to moisture without protection.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard spring guides and retainers?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes — closed and ground ends make these springs compatible with standard flat spring seats, guide rods, and retainer cups. Verify that your guide rod diameter is smaller than the spring's inner diameter (OD minus 2× wire diameter) and that your retainer cup inner diameter is larger than the OD. With 13 OD options, you can find a match for most standard tooling.\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, CNC machine, or automation fixture?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. These compression springs are commonly used in DIY 3D-printer Z-axis leveling, CNC hold-down clamps, pneumatic fixture return mechanisms, and light conveyor buffer stops. Select the OD and length that match your mounting geometry, and confirm the spring rate meets your force requirement before finalizing your design.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 1 PCS, 2 PCS, and 5 PCS pack options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe pack quantity refers to the number of identical springs included in one order. Smaller packs (1 PCS) are ideal for prototyping or single-fixture builds, while 5 PCS packs offer better value for production runs or builds requiring multiple springs of the same specification. Pack availability varies by OD and length combination — check the variant selector for options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the spring fits before I finalize my order?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBefore ordering, confirm three dimensions: (1) OD — must clear your housing bore with 1–2mm gap; (2) inner diameter (OD − 2 × 3.5mm) — must clear your guide rod; (3) free length — must allow your required working stroke without reaching solid height. If you are unsure, order a single-piece sample of your target variant first, then scale up once fit is confirmed.\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 × Outer Diameter, Length, and Packing 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 outer diameter for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the bore or housing your spring will sit inside, then select an OD that provides a small clearance — typically 1–2mm smaller than the bore. For a guide rod application, measure the rod diameter and choose an inner diameter (OD minus two wire diameters) that clears the rod with 0.5–1mm of play. This product offers ODs from 20mm to 50mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What free length should I select for my design?\",\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. Your working deflection should not exceed 70–80% of the free length. Available lengths range from 60mm to 305mm.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How strong are these compression springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring force depends on wire diameter, OD, free length, and number of active coils. With a 3.5mm wire diameter, these springs are suited for moderate-to-heavy-duty DIY and light industrial applications. For precise load requirements, use the spring rate formula or contact us with your target load and deflection.\"\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 spring steel, which offers good mechanical properties but moderate corrosion resistance in dry indoor environments. For outdoor or humid applications, apply a light coat of corrosion-inhibiting oil or grease.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these compatible with standard spring guides and retainers?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes — closed and ground ends make these springs compatible with standard flat spring seats, guide rods, and retainer cups. Verify that your guide rod diameter is smaller than the spring's inner diameter and that your retainer cup inner diameter is larger than the OD.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I use these springs in a 3D printer, CNC machine, or automation fixture?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. These compression springs are commonly used in DIY 3D-printer Z-axis leveling, CNC hold-down clamps, pneumatic fixture return mechanisms, and light conveyor buffer stops.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 1 PCS, 2 PCS, and 5 PCS pack options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The pack quantity refers to the number of identical springs included in one order. Smaller packs are ideal for prototyping, while 5 PCS packs offer better value for production runs. Pack availability varies by OD and length combination.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I verify the spring fits before I finalize my order?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Confirm three dimensions: (1) OD must clear your housing bore with 1–2mm gap; (2) inner diameter (OD − 2 × 3.5mm) must clear your guide rod; (3) free length must allow your required working stroke without reaching solid height. Order a single-piece sample first if unsure.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"3.5mm x 20mm \/ 60mm \/ 5 PCS","offer_id":52450939928850,"sku":"Adaah2024TENGLUOWJ13489x5","price":27.44,"currency_code":"USD","in_stock":true},{"title":"3.5mm x 20mm \/ 70mm \/ 5 PCS","offer_id":52450939961618,"sku":"Adaah2024TENGLUOWJ13490x5","price":28.68,"currency_code":"USD","in_stock":true},{"title":"3.5mm x 20mm \/ 80mm \/ 5 PCS","offer_id":52450939994386,"sku":"Adaah2024TENGLUOWJ13491x5","price":30.72,"currency_code":"USD","in_stock":true},{"title":"3.5mm x 20mm \/ 90mm \/ 5 PCS","offer_id":52450940027154,"sku":"Adaah2024TENGLUOWJ13492x5","price":32.76,"currency_code":"USD","in_stock":true},{"title":"3.5mm x 20mm \/ 100mm \/ 5 PCS","offer_id":52450940059922,"sku":"Adaah2024TENGLUOWJ13493x5","price":34.8,"currency_code":"USD","in_stock":true},{"title":"3.5mm x 20mm \/ 120mm \/ 5 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