{"product_id":"compression-spring-wire-dia-2-4mm-stainless-steel-305mm","title":"Compression Spring Wire Dia 2-4mm Pressure Small Stainless steel 305mm Length","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eCompression Springs — Stainless Steel, Wire Dia 2–4mm, 305mm Length\u003c\/h2\u003e\n\u003cp\u003eFinding a compression spring that holds its load cycle after cycle without corroding or fatiguing is a real challenge for engineers, makers, and repair technicians alike. These stainless steel compression springs are sized for precision mechanical assemblies where consistent spring force and dimensional accuracy matter — whether you are prototyping a new mechanism or replacing a worn component in an existing machine.\u003c\/p\u003e\n\u003cp\u003eEach spring is formed from stainless steel wire in diameters of 2mm, 2.5mm, 3mm, or 4mm, with outer diameters ranging from 14mm to 40mm (approximately 0.55 in to 1.57 in). The standard body length is 305mm (approximately 12 in). Exact free length, spring rate, and solid height vary by wire and outer diameter combination — see variant options for the configuration that matches your application.\u003c\/p\u003e\n\u003cp\u003eThese compression springs suit a wide range of use cases: valve return mechanisms in pneumatic and hydraulic systems, tension-relief assemblies in 3D printer extruder carriages, load-bearing suspension elements in small robotics platforms, and general-purpose compression spring replacement in industrial equipment maintenance. The stainless steel construction makes them a reliable choice for compression spring applications in damp or mildly corrosive environments.\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 compression spring seats and bores sized to match the selected outer diameter. Verify bore clearance and seat recess depth against your specific outer diameter and wire diameter variant before ordering.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Compression Springs\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eStainless Steel Construction\u003c\/strong\u003e\u003cbr\u003eFormed from corrosion-resistant stainless steel wire for durability in mechanical and light industrial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Range\u003c\/strong\u003e\u003cbr\u003eWire diameters from 2mm to 4mm; outer diameters from 14mm to 40mm — covering a broad spectrum of compression spring seat sizes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e305mm Standard Body Length\u003c\/strong\u003e\u003cbr\u003eConsistent 305mm (≈12 in) body length allows cutting to custom free lengths or direct installation in long-travel spring guides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e\u003cstrong\u003eConsistent Spring Force\u003c\/strong\u003e\u003cbr\u003eUniform wire diameter and coil pitch across the full length deliver repeatable load-deflection characteristics for engineering applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e\u003cbr\u003eEnds are closed to provide flat seating surfaces, reducing lateral buckling tendency and improving load alignment in spring guides.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eAvailable in 1-Piece or 2-Piece Packs\u003c\/strong\u003e\u003cbr\u003eOrder a single spring for prototyping or a 2-piece pack for paired assemblies — select your quantity in the variant options above.\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\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e2mm \/ 2.5mm \/ 3mm \/ 4mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e14mm – 40mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBody Length\u003c\/th\u003e\n\u003ctd\u003e305mm (approx. 12 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpring Type\u003c\/th\u003e\n\u003ctd\u003eCompression (closed ends)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\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\u003eSolid Height\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 pcs or 2 pcs (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eNatural stainless (uncoated)\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 inner diameter your spring must fit inside — the spring outer diameter should be 0.5mm to 1.5mm smaller than the bore for clearance. Then select a wire diameter based on the load you need: heavier loads require thicker wire. If you are unsure, select your outer diameter first from the variant options and contact us with your load and travel requirements for guidance.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the spring rate, and can I calculate the load for a specific deflection?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSpring rate (N\/mm or lbf\/in) describes how much force is required to compress the spring by one unit of length. The rate depends on wire diameter, outer diameter, number of active coils, and material modulus. Because these springs are 305mm long and can be cut or used at varying free lengths, the effective rate will vary. Contact us with your wire diameter, OD, and intended free length for a rate estimate.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these springs corrosion-resistant enough for outdoor or wet environments?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eStainless steel offers good resistance to moisture, mild acids, and atmospheric corrosion, making these springs suitable for damp indoor environments, light outdoor exposure, and applications where occasional water contact is expected. For highly corrosive environments (salt spray, strong acids, or chlorinated water), consider additional protective measures or contact us to discuss material options.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I cut the spring to a shorter free length?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. The 305mm body length is intentionally long to allow cutting to your required free length. Use an angle grinder or spring cutter for a clean cut. After cutting, lightly grind the cut end flat if a closed-end seating surface is needed. Note that cutting changes the number of active coils and therefore the spring rate — recalculate or test the rate after cutting.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 1-piece and 2-piece pack options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eBoth options contain the same spring in the same wire diameter, outer diameter, and 305mm length. The 1-piece pack is ideal for single-spring applications or prototyping. The 2-piece pack is suited for paired or mirrored spring assemblies — for example, dual-spring suspension setups or redundant return mechanisms — and typically offers a lower per-unit cost.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eHow do I verify the spring will fit my existing spring guide or seat?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your spring guide rod diameter (the inner guide, if used) and your housing bore diameter. The spring inner diameter (ID = OD minus 2× wire diameter) should be at least 0.5mm larger than the guide rod. The spring outer diameter should be at least 0.5mm smaller than the housing bore. Check the variant options for the OD and wire diameter combination that satisfies both clearances for your assembly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these suitable for high-cycle fatigue applications such as valve springs?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese stainless steel compression springs are appropriate for moderate-cycle mechanical applications including valve returns, jig fixtures, and general machinery. For very high-cycle fatigue applications (millions of cycles at high stress), specify your cycle count and stress requirements when contacting us, as shot-peened or music wire springs may be more appropriate for those conditions.\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, 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\": \"Start with the bore or housing inner diameter your spring must fit inside — the spring outer diameter should be 0.5mm to 1.5mm smaller than the bore for clearance. Then select a wire diameter based on the load you need: heavier loads require thicker wire. If you are unsure, select your outer diameter first from the variant options and contact us with your load and travel requirements for guidance.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the spring rate, and can I calculate the load for a specific deflection?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Spring rate (N\/mm or lbf\/in) describes how much force is required to compress the spring by one unit of length. The rate depends on wire diameter, outer diameter, number of active coils, and material modulus. Because these springs are 305mm long and can be cut or used at varying free lengths, the effective rate will vary. 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Note that cutting changes the number of active coils and therefore the spring rate — recalculate or test the rate after cutting.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 1-piece and 2-piece pack options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Both options contain the same spring in the same wire diameter, outer diameter, and 305mm length. The 1-piece pack is ideal for single-spring applications or prototyping. The 2-piece pack is suited for paired or mirrored spring assemblies and typically offers a lower per-unit cost.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I verify the spring will fit my existing spring guide or seat?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure your spring guide rod diameter and your housing bore diameter. The spring inner diameter (ID = OD minus 2× wire diameter) should be at least 0.5mm larger than the guide rod. The spring outer diameter should be at least 0.5mm smaller than the housing bore. Check the variant options for the OD and wire diameter combination that satisfies both clearances.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these suitable for high-cycle fatigue applications such as valve springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These stainless steel compression springs are appropriate for moderate-cycle mechanical applications including valve returns, jig fixtures, and general machinery. For very high-cycle fatigue applications, specify your cycle count and stress requirements when contacting us.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"2 \/ 30 \/ 305 \u0026 1pcs","offer_id":52450269987090,"sku":"WZYGLTLWJ2058x1","price":28.8,"currency_code":"USD","in_stock":true},{"title":"2.5 \/ 14 \/ 305 \u0026 1pcs","offer_id":52450270019858,"sku":"WZYGLBZSJ051863x1","price":18.69,"currency_code":"USD","in_stock":true},{"title":"2.5 \/ 16 \/ 305 \u0026 1pcs","offer_id":52450270052626,"sku":"WZYGLBZSJ051864x1","price":22.14,"currency_code":"USD","in_stock":true},{"title":"2.5 \/ 20 \/ 305 \u0026 1pcs","offer_id":52450270085394,"sku":"WZYGLBZSJ051865x1","price":35.58,"currency_code":"USD","in_stock":true},{"title":"2.5 \/ 22 \/ 305 \u0026 1pcs","offer_id":52450270118162,"sku":"WZYGLBZSJ051866x1","price":26.3,"currency_code":"USD","in_stock":true},{"title":"2.5 \/ 25 \/ 305 \u0026 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