{"product_id":"compression-spring-304-stainless-steel-0-4x3x10mm-1000pcs","title":"1000pcs Compression Spring A2 304 Stainless Steel Pressure Springs 0.4x3x10mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n  \u003cdiv class=\"hdiy-overview\"\u003e\n    \u003ch2\u003eCompression Spring 0.4x3x10mm — Reliable Pressure Springs for Precision Applications\u003c\/h2\u003e\n    \u003cp\u003eWhen a failed spring causes a mechanism to jam, a sensor to misfire, or a latch to stick, the cost is far greater than the part itself. Engineers, electronics technicians, and hands-on DIYers who work with compact assemblies need a dependable stock of correctly sized compression springs — and running out mid-project is not an option. These 1000-piece compression springs are sized for tight-tolerance work where consistency across every unit matters.\u003c\/p\u003e\n    \u003cp\u003eEach spring is manufactured from A2-grade 304 stainless steel wire with a wire diameter of 0.4 mm (0.016 in), an outer diameter of 3 mm (0.118 in), and a free length of 10 mm (0.394 in). The coil count is typically 15–20 active coils depending on pitch, with closed and ground ends for stable seating. The 304 alloy provides solid corrosion resistance across a broad temperature range.\u003c\/p\u003e\n    \u003cp\u003eTypical use cases include PCB-mounted battery contacts and switch mechanisms, small-scale robotics and automation actuators requiring consistent return force, precision instrument housings, pen mechanisms, and miniature latch assemblies where a compact compression spring for electronics is essential.\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 applications requiring an outer diameter of 3 mm (0.118 in) and free length of 10 mm (0.394 in). Verify bore and seat dimensions before installation.\n  \u003c\/div\u003e\n\n  \u003ch2\u003e✅ Key Features of These 304 Stainless Steel Compression Springs\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-features\"\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🧲\u003c\/div\u003e\n      \u003cstrong\u003eA2-Grade 304 Stainless Steel\u003c\/strong\u003e\n      \u003cp\u003eResists oxidation, moisture, and mild chemical exposure — suitable for indoor and light outdoor environments without surface treatment.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📏\u003c\/div\u003e\n      \u003cstrong\u003ePrecision Wire Diameter: 0.4 mm\u003c\/strong\u003e\n      \u003cp\u003eConsistent 0.4 mm (0.016 in) wire diameter across all 1000 pieces ensures uniform spring rate and predictable deflection behavior in every assembly.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e⚙️\u003c\/div\u003e\n      \u003cstrong\u003eCompact 3 × 10 mm Form Factor\u003c\/strong\u003e\n      \u003cp\u003e3 mm outer diameter and 10 mm free length fit tight-clearance bores in electronics housings, pen mechanisms, and miniature actuators.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e📦\u003c\/div\u003e\n      \u003cstrong\u003e1000-Piece Bulk Pack\u003c\/strong\u003e\n      \u003cp\u003eSufficient quantity for production runs, prototyping batches, or maintaining a workshop stock of small compression springs without frequent reordering.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🔄\u003c\/div\u003e\n      \u003cstrong\u003eClosed \u0026amp; Ground Ends\u003c\/strong\u003e\n      \u003cp\u003eFlat, ground end coils provide stable seating on flat surfaces and reduce lateral buckling under load — important for vertical spring columns.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv\u003e\n      \u003cdiv class=\"hdiy-icon\"\u003e🌡️\u003c\/div\u003e\n      \u003cstrong\u003eBroad Operating Temperature Range\u003c\/strong\u003e\n      \u003cp\u003e304 stainless steel maintains mechanical properties from approximately −40 °C to +300 °C (−40 °F to +572 °F), covering most indoor and light industrial environments.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003ch2\u003e📐 Technical Specifications — Compression Springs\u003c\/h2\u003e\n  \u003cdiv class=\"hdiy-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eA2 304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eWire Diameter\u003c\/th\u003e\n\u003ctd\u003e0.4 mm (0.016 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOuter Diameter\u003c\/th\u003e\n\u003ctd\u003e3 mm (0.118 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eInner Diameter\u003c\/th\u003e\n\u003ctd\u003eapprox. 2.2 mm (0.087 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eFree Length\u003c\/th\u003e\n\u003ctd\u003e10 mm (0.394 in)\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 Rate\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eMax Load\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\u003eNatural (uncoated)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eQuantity per Pack\u003c\/th\u003e\n\u003ctd\u003e1000 pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eOperating Temperature\u003c\/th\u003e\n\u003ctd\u003e−40 °C to +300 °C (−40 °F to +572 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003cth\u003eCoil Direction\u003c\/th\u003e\n\u003ctd\u003eRight-hand\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\u003eWhat does 0.4x3x10mm mean for this compression spring?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe three numbers refer to wire diameter × outer diameter × free length. So 0.4x3x10mm means a 0.4 mm wire, 3 mm outer diameter, and 10 mm uncompressed length. Always match all three dimensions to your application's bore, shaft, and travel requirements.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eIs 304 stainless steel strong enough for my application?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 stainless steel offers a good balance of tensile strength and corrosion resistance for light-to-medium load applications. For very high-cycle fatigue or heavy-load environments, consider music wire or 316 stainless alternatives. For electronics contacts, pen mechanisms, and small actuators, 304 is well-suited.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWill these springs rust or corrode?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eA2-grade 304 stainless steel provides solid resistance to oxidation and moisture in most indoor and light outdoor environments. It is not recommended for prolonged exposure to chloride-rich environments (e.g., saltwater or pool chemicals) without additional protection.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat applications are these 3mm compression springs compatible with?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese springs are commonly used in battery contacts, push-button switches, pen and stylus mechanisms, miniature latches, sensor housings, small robotics actuators, and any assembly requiring a 3 mm OD spring with 10 mm free length. Verify your bore diameter accommodates a 3 mm OD with appropriate clearance.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eHow do I choose the right compression spring size?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMatch the outer diameter to your bore (OD should be slightly smaller than the bore), the inner diameter to your shaft (ID should be slightly larger than the shaft), and the free length to your available travel plus compressed length. The wire diameter determines the spring rate — thicker wire = stiffer spring.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhy buy 1000 pieces instead of a smaller quantity?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSmall compression springs are easy to lose during assembly and often needed in multiples per unit. A 1000-piece pack is cost-effective for prototyping batches, small production runs, or maintaining a workshop stock so you are never blocked waiting for a reorder.\u003c\/p\u003e\u003c\/div\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails\u003e\n      \u003csummary\u003eWhat is the operating temperature range of these springs?\u003c\/summary\u003e\n      \u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 stainless steel maintains its mechanical properties from approximately −40 °C to +300 °C (−40 °F to +572 °F). For applications exceeding this range, consult a spring engineer for high-temperature alloy alternatives.\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 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\": \"What does 0.4x3x10mm mean for this compression spring?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The three numbers refer to wire diameter × outer diameter × free length. So 0.4x3x10mm means a 0.4 mm wire, 3 mm outer diameter, and 10 mm uncompressed length. Always match all three dimensions to your application's bore, shaft, and travel requirements.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 304 stainless steel strong enough for my application?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel offers a good balance of tensile strength and corrosion resistance for light-to-medium load applications. For very high-cycle fatigue or heavy-load environments, consider music wire or 316 stainless alternatives. For electronics contacts, pen mechanisms, and small actuators, 304 is well-suited.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these springs rust or corrode?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A2-grade 304 stainless steel provides solid resistance to oxidation and moisture in most indoor and light outdoor environments. It is not recommended for prolonged exposure to chloride-rich environments without additional protection.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What applications are these 3mm compression springs compatible with?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These springs are commonly used in battery contacts, push-button switches, pen and stylus mechanisms, miniature latches, sensor housings, small robotics actuators, and any assembly requiring a 3 mm OD spring with 10 mm free length.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose the right compression spring size?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Match the outer diameter to your bore, the inner diameter to your shaft, and the free length to your available travel plus compressed length. The wire diameter determines the spring rate — thicker wire means a stiffer spring.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why buy 1000 pieces instead of a smaller quantity?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Small compression springs are easy to lose during assembly and often needed in multiples per unit. A 1000-piece pack is cost-effective for prototyping batches, small production runs, or maintaining a workshop stock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the operating temperature range of these springs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel maintains its mechanical properties from approximately −40 °C to +300 °C (−40 °F to +572 °F).\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Default Title","offer_id":52450374615314,"sku":"Adaah050092x1000","price":200.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_3d9e5267-66f5-4363-b708-c32802a68712.jpg?v=1783945004","url":"https:\/\/homediyer.com\/products\/compression-spring-304-stainless-steel-0-4x3x10mm-1000pcs","provider":"HomeDIYer","version":"1.0","type":"link"}