{"product_id":"300mm-compression-spring-steel-wire-dia-2-4-5mm","title":"Large 300mm Length Compression Spring Spring Steel Wire Dia.2\/2.5\/3\/3.5\/4\/4.5mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e300mm Compression Springs — Reliable Spring Steel for Industrial \u0026amp; DIY Applications\u003c\/h2\u003e\n\u003cp\u003eWhen a standard off-the-shelf spring just won't cut it, engineers, mechanics, and serious DIYers reach for a purpose-matched compression spring. These 300mm length compression springs are designed for applications where a longer travel range and consistent load response are non-negotiable — whether you're building custom machinery, repairing industrial equipment, or prototyping a mechanical assembly.\u003c\/p\u003e\n\u003cp\u003eEach spring is formed from spring steel wire, available in wire diameters of 2.0, 2.5, 3.0, 3.5, 4.0, and 4.5 mm (approximately 0.079–0.177 in), with a fixed body length of 300 mm (11.81 in). Outer diameters vary by wire size and coil count — see variant options for exact OD dimensions. The closed-end coil construction provides stable seating on flat surfaces without additional hardware.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include linear actuator return mechanisms, valve spring replacements in pneumatic systems, suspension damping assemblies in light machinery, and custom jig or fixture clamping setups where a long-travel spring is required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e🔧\u003c\/span\u003e Compatible with standard spring seats, guide rods, and cylindrical bores sized to match the selected outer diameter. Verify bore clearance and free length before ordering.\u003c\/div\u003e\n\u003ch2\u003e✅ Key Features of These 300mm Compression Springs\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSpring Steel Construction\u003c\/strong\u003e\u003cp\u003eFormed from carbon spring steel wire for consistent elastic return and resistance to set under repeated compression cycles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003e300mm Free Length\u003c\/strong\u003e\u003cp\u003eLong 300 mm (11.81 in) body provides extended travel range — ideal for machinery, fixtures, and custom mechanical assemblies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚙️\u003c\/span\u003e\u003cstrong\u003eWide Wire Diameter Range\u003c\/strong\u003e\u003cp\u003eAvailable in 2.0, 2.5, 3.0, 3.5, 4.0, and 4.5 mm wire diameters to match varying load and deflection requirements.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🎯\u003c\/span\u003e\u003cstrong\u003eClosed-End Coil Design\u003c\/strong\u003e\u003cp\u003eClosed and ground ends ensure flat, stable seating on spring plates and guide rods without rocking or misalignment.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003eCorrosion-Resistant Finish\u003c\/strong\u003e\u003cp\u003eSurface treated to provide baseline protection against oxidation during storage and light-duty indoor use.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eConsistent Load Rate\u003c\/strong\u003e\u003cp\u003eUniform coil pitch delivers a linear spring rate across the compression stroke, supporting predictable force calculations in engineering applications.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003e📐 Technical Specifications — Compression Spring\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\u003ctable\u003e\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\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e2.0 \/ 2.5 \/ 3.0 \/ 3.5 \/ 4.0 \/ 4.5 mm (0.079–0.177 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e300 mm (11.81 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInner Diameter\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\u003eClosed ends (typically ground)\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\u003eOxidation-resistant treatment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Size\u003c\/th\u003e\n\u003ctd\u003e1 pc per unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I choose the right wire diameter for my application?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eWire diameter directly affects the spring rate and load capacity. Thinner wire (2.0–2.5 mm) suits lighter loads and lower spring rates, while thicker wire (3.5–4.5 mm) handles heavier loads and stiffer deflection requirements. Calculate your required spring rate and maximum load, then select the wire diameter that falls within that range. If you are unsure, contact us with your load and deflection specs.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the outer diameter of each size variant?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe size format shown in the variant selector follows the pattern: Wire Dia × Outer Dia × Free Length (all in mm). For example, \"2.0×10×300 mm\" means wire diameter 2.0 mm, outer diameter 10 mm, free length 300 mm. Select the variant that matches your bore or guide rod clearance.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these springs suitable for outdoor or corrosive environments?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese springs are made from carbon spring steel with a surface treatment that provides basic oxidation resistance. They are suitable for indoor and dry environments. For outdoor, high-humidity, or chemically aggressive environments, consider stainless steel springs or apply an additional protective coating after installation.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan these springs be used in automotive suspension or valve applications?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese 300mm compression springs are well-suited for light machinery, pneumatic valve returns, fixture clamping, and prototype assemblies. For safety-critical automotive suspension applications, always verify the spring rate, load capacity, and fatigue life against your engineering requirements before use.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I measure if this spring fits my guide rod or bore?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure your guide rod outer diameter — the spring inner diameter should be slightly larger than the rod for a sliding fit (typically 0.5–1.5 mm clearance). Measure your bore inner diameter — the spring outer diameter should be slightly smaller than the bore (typically 0.5–2 mm clearance). Refer to the variant size format to identify the outer diameter before ordering.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat does the size format \"2.0×10×300 mm\" mean?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe three numbers represent: Wire Diameter × Outer Diameter × Free Length, all in millimeters. So \"2.0×10×300 mm\" is a spring with 2.0 mm wire, 10 mm outer diameter, and 300 mm free length. Use this format to match the spring to your application's dimensional requirements.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow many pieces are included per order?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eEach unit contains 1 piece (1 pcs) as shown in the Pack Size option. If you need multiple springs, simply adjust the quantity in your cart before checkout.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Size and Pack Size above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"How do I choose the right wire diameter for my application?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Wire diameter directly affects the spring rate and load capacity. 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