{"product_id":"spring-steel-compression-springs-03mm-wire-od-45mm-8mm","title":"10Pcs Spring Steel Compression Pressure Springs 0.3mm Wire Diameter OD 4.5mm-8mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003eSpring Steel Compression Springs — Precision-Wound for Reliable Return Force\u003c\/h2\u003e\n\u003cp\u003eWhen a loose or undersized spring causes your mechanism to fail mid-cycle, the frustration is real — especially for makers, engineers, and hobbyists who need consistent performance from every component. These compression pressure springs are designed for builders who demand repeatable spring force in compact assemblies without hunting through bulk hardware bins for the right size.\u003c\/p\u003e\n\u003cp\u003eEach pack contains 10 springs wound from spring steel wire with a diameter of 0.3mm (approx. 0.012 in). Outer diameter options span 4.5mm to 8mm (approx. 0.177–0.315 in), and free lengths range from 5mm to 50mm (approx. 0.197–1.969 in), giving you precise dimensional control for your application. The close-wound coil geometry provides uniform pitch and consistent load characteristics across the full compression range.\u003c\/p\u003e\n\u003cp\u003eTypical use cases include small electronics enclosures requiring button-return mechanisms, pen and stylus assemblies needing light-load compression springs, miniature valve and latch mechanisms in DIY robotics, and precision instrument housings where compact spring steel coil springs must fit within tight radial clearances.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-compat\"\u003e\n\u003cspan class=\"hdiy-compat-icon\"\u003e⚙️\u003c\/span\u003e \u003cstrong\u003eCompatibility:\u003c\/strong\u003e Suitable for spring seats, bores, and housings sized to match the selected outer diameter. Verify bore clearance and seat depth against your chosen OD and free length variant before ordering.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These Compression Pressure Springs\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e\u003cstrong\u003eSpring Steel Construction\u003c\/strong\u003e — Wound from spring steel wire for consistent elastic return and resistance to permanent set under repeated cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eWide Size Matrix\u003c\/strong\u003e — 0.3mm wire diameter with OD options from 4.5mm to 8mm and lengths from 5mm to 50mm, covering a broad range of compact assembly requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e\u003cstrong\u003eUniform Coil Pitch\u003c\/strong\u003e — Close-wound geometry ensures even load distribution and predictable deflection behavior across the compression stroke.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003e10-Piece Pack\u003c\/strong\u003e — Supplied in a quantity of 10 per order, providing spares for prototyping, testing, and replacement without over-ordering.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e\u003cstrong\u003eVersatile Application Range\u003c\/strong\u003e — Suited for button returns, pen mechanisms, miniature latches, sensor housings, and other light-load compression spring applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cstrong\u003eCompact Form Factor\u003c\/strong\u003e — Small wire diameter and tight OD tolerances allow installation in space-constrained designs where larger springs cannot fit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Compression Pressure Springs\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\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\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e0.3mm (approx. 0.012 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOuter Diameter (OD)\u003c\/th\u003e\n\u003ctd\u003e4.5mm \/ 5mm \/ 6mm \/ 7mm \/ 8mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e5mm – 50mm (see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCoil Type\u003c\/th\u003e\n\u003ctd\u003eCompression (close-wound)\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\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\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e10 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-faq\"\u003e\n\u003ch2\u003e❓ Frequently Asked Questions\u003c\/h2\u003e\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\n\u003cp\u003eMeasure the bore or housing inner diameter where the spring will seat. The spring's outer diameter should be slightly smaller than the bore to allow free movement without binding. For a spring seat (post), the spring's inner diameter (OD minus 2× wire diameter) should be slightly larger than the post. Select the OD variant closest to your target clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat free length should I select?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eFree length is the uncompressed length of the spring. Choose a free length longer than your required working stroke plus any solid-height clearance. For example, if your mechanism compresses the spring by 10mm, a free length of 20–25mm typically provides adequate working range without coil bind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these springs corrosion-resistant?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eSpring steel offers good mechanical properties but has moderate corrosion resistance. For indoor, dry, or low-humidity environments these springs perform reliably. For applications exposed to moisture, chemicals, or outdoor conditions, consider adding a protective coating or selecting stainless steel springs instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat load capacity can I expect from a 0.3mm wire diameter spring?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eA 0.3mm wire diameter spring is designed for light-load applications. Typical spring rates and maximum loads depend on the specific OD and free length combination. These springs are suited for button returns, pen mechanisms, sensor contacts, and similar low-force applications rather than heavy-duty industrial use. Contact us to confirm load specifications for your chosen variant.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these springs in automated or repetitive-cycle equipment?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eYes, spring steel compression springs are designed for repeated cycling. Performance longevity depends on operating within the spring's elastic range — avoid compressing to solid height (coil bind) during normal operation, as this causes fatigue and permanent set over time. For high-cycle applications, ensure your design limits maximum deflection to approximately 80% of the available stroke.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these compatible with standard spring seats and plunger assemblies?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eThese springs are compatible with standard spring seats, plunger bores, and guide posts sized to match the selected OD variant. Verify that your assembly's bore diameter, seat depth, and post diameter align with the spring's OD and inner diameter before installation. The 10-piece pack allows for fit-testing across multiple prototype iterations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the OD variants (4.5mm, 5mm, 6mm, 7mm, 8mm)?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\n\u003cp\u003eAll variants share the same 0.3mm wire diameter and spring steel material. The outer diameter determines the radial footprint of the spring and its inner diameter (ID = OD − 2× wire diameter). A larger OD generally provides a slightly higher spring rate for the same free length. Select the OD that fits your housing bore or guide post with appropriate clearance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Wire Diameter, Outer Diameter, and Length above, then add to cart.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"HomeDIYer","offers":[{"title":"0.3mm \/ 4.5mm \/ 5mm","offer_id":52449583726866,"sku":"BGMDLWJ12777x1","price":8.02,"currency_code":"USD","in_stock":true},{"title":"0.3mm \/ 4.5mm \/ 10mm","offer_id":52449583759634,"sku":"BGMDLWJ12778x1","price":8.02,"currency_code":"USD","in_stock":true},{"title":"0.3mm \/ 4.5mm \/ 15mm","offer_id":52449583792402,"sku":"BGMDLWJ12779x1","price":8.02,"currency_code":"USD","in_stock":true},{"title":"0.3mm \/ 4.5mm \/ 20mm","offer_id":52449583825170,"sku":"BGMDLWJ12780x1","price":8.02,"currency_code":"USD","in_stock":true},{"title":"0.3mm \/ 4.5mm \/ 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