{"product_id":"304-stainless-steel-round-disc-plate","title":"304 Stainless Steel Round Discs Sheet Plate Dia 150\/200\/250\/300mm, Thick 1mm~3mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e304 Stainless Steel Round Disc Plates — Precision-Cut Blanks for DIY Fabrication \u0026amp; Industrial Use\u003c\/h2\u003e\n\u003cp\u003eWhen a project calls for a flat, circular metal blank that won't rust, warp, or corrode under load, finding the right disc in the right size can be frustrating. Whether you're a hobbyist machinist, a workshop fabricator, or a maintenance professional, these 304 stainless steel round disc plates give you a ready-to-use starting point — no rough cutting, no guesswork on alloy grade.\u003c\/p\u003e\n\u003cp\u003eEach disc is cut from 304-grade stainless steel sheet, offering a balanced combination of corrosion resistance, weldability, and workability. Diameters range from Ø100mm (~3.94\") to Ø300mm (~11.81\"), with wall thicknesses from 1mm (~0.039\") to 3mm (~0.118\"), available in 0.5mm increments. Edges are machine-cut; surface finish is the standard 2B mill finish typical of 304 sheet stock.\u003c\/p\u003e\n\u003cp\u003eTypical applications include custom flanges and backing plates for plumbing or HVAC work, base plates for welding fixtures and jigs, decorative medallions and sign blanks, heat shields and splash guards in automotive or appliance repair, and circular templates for layout and marking tasks in metalworking shops.\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 MIG\/TIG welding, drilling, grinding, and plasma cutting. Compatible with standard stainless steel fasteners and fittings. Not recommended for applications requiring magnetic permeability — 304 SS is non-magnetic in annealed condition.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 304 Stainless Steel Round Disc Plates\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛡️\u003c\/span\u003e\u003cstrong\u003e304-Grade Alloy:\u003c\/strong\u003e Contains 18% chromium and 8% nickel, providing reliable resistance to oxidation, moisture, and mild chemical exposure without surface coatings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📐\u003c\/span\u003e\u003cstrong\u003eMultiple Diameter Options:\u003c\/strong\u003e Available in Ø100mm, Ø150mm, Ø200mm, and Ø300mm — covering the most common blank sizes needed for flanges, templates, and decorative discs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eSelectable Thickness:\u003c\/strong\u003e Choose from 1mm, 1.5mm, 2mm, 2.5mm, or 3mm to match your structural or weight requirements without over-engineering the part.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✂️\u003c\/span\u003e\u003cstrong\u003eMachine-Cut Edges:\u003c\/strong\u003e Discs are cut to a consistent circular profile, reducing the prep time needed before welding, drilling, or finishing operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eWeldable \u0026amp; Machinable:\u003c\/strong\u003e 304 SS responds well to TIG and MIG processes and can be drilled or tapped with standard HSS or carbide tooling using appropriate cutting speeds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Pack Quantities:\u003c\/strong\u003e Smaller diameters (Ø100mm) are available in 2-piece packs for projects requiring matched pairs; larger sizes ship as single pieces to keep costs proportional.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — 304 Stainless Steel Round Disc Plate\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003e304 Stainless Steel (18-8)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShape\u003c\/th\u003e\n\u003ctd\u003eRound \/ Circular Disc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDiameter Range\u003c\/th\u003e\n\u003ctd\u003eØ100mm – Ø300mm (approx. 3.94\" – 11.81\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThickness Range\u003c\/th\u003e\n\u003ctd\u003e1mm – 3mm (approx. 0.039\" – 0.118\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThickness Increments\u003c\/th\u003e\n\u003ctd\u003e1mm, 1.5mm, 2mm, 2.5mm, 3mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003e2B Mill Finish (standard cold-rolled)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEdge Condition\u003c\/th\u003e\n\u003ctd\u003eMachine-cut; may require light deburring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChromium Content\u003c\/th\u003e\n\u003ctd\u003e17.5–19.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNickel Content\u003c\/th\u003e\n\u003ctd\u003e8–10.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMagnetic Properties\u003c\/th\u003e\n\u003ctd\u003eNon-magnetic (annealed condition)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeldability\u003c\/th\u003e\n\u003ctd\u003eTIG \/ MIG compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Quantity\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight (per piece)\u003c\/th\u003e\n\u003ctd\u003eSee variant options\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 diameter for my project?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the opening or footprint your disc needs to cover or fit into, then select the next size up to allow for trimming or drilling. For flanges, match the disc diameter to the outer flange OD of your fitting. For decorative or template use, the disc can be used as-cut at the listed diameter.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhich thickness should I choose for a structural backing plate?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor light-duty backing plates or decorative applications, 1mm–1.5mm is typically sufficient. For load-bearing flanges, weld backing, or heat shields subject to mechanical stress, 2mm–3mm provides greater rigidity. When in doubt, go one step thicker — the weight difference between 2mm and 3mm on a Ø150mm disc is modest.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eIs 304 stainless steel rust-proof outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 SS offers strong resistance to atmospheric corrosion and moisture in most outdoor environments. However, it is not fully immune — prolonged exposure to chloride-rich environments (coastal salt air, road de-icing salts) can cause surface staining or pitting over time. For marine or high-chloride settings, 316-grade stainless steel is the more appropriate choice.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eCan I weld these discs to mild steel or other stainless grades?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 304 SS can be TIG or MIG welded to mild steel using 309L filler rod, which bridges the dissimilar metal joint. When welding 304 to 304, use 308L filler. Avoid welding to 400-series (ferritic\/martensitic) stainless without consulting a welding procedure specification, as the joint properties differ significantly.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eDo the edges need finishing before use?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMachine-cut edges are consistent in profile but may have minor burrs depending on the cutting method. For applications where the edge will be handled frequently or where a smooth seating surface is needed, a quick pass with a deburring tool, file, or flap disc on an angle grinder will bring the edge to a clean finish. For purely structural or hidden applications, the as-cut edge is generally acceptable.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eAre these discs suitable for food-contact or sanitary applications?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 stainless steel is widely used in food processing and commercial kitchen equipment due to its corrosion resistance and ease of cleaning. However, the 2B mill finish on these discs is not a polished or electropolished surface. If your application requires a sanitary finish (e.g., Ra ≤ 0.8 µm), you would need to polish the surface after purchase. The base material itself is food-grade compatible.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eWhy does the Ø100mm disc come in a 2-piece pack while larger sizes are single pieces?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSmaller discs are frequently used in pairs — for example, as matched end caps, symmetrical mounting plates, or paired templates. The 2-piece pack for Ø100mm reflects this common use pattern and offers better value for those applications. Larger diameters (Ø150mm and above) are more often used individually, so single-piece pricing keeps the cost proportional to the material involved.\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 Diameter x Thickness 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 diameter for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the opening or footprint your disc needs to cover or fit into, then select the next size up to allow for trimming or drilling. For flanges, match the disc diameter to the outer flange OD of your fitting. For decorative or template use, the disc can be used as-cut at the listed diameter.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which thickness should I choose for a structural backing plate?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light-duty backing plates or decorative applications, 1mm–1.5mm is typically sufficient. For load-bearing flanges, weld backing, or heat shields subject to mechanical stress, 2mm–3mm provides greater rigidity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 304 stainless steel rust-proof outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 SS offers strong resistance to atmospheric corrosion and moisture in most outdoor environments. However, prolonged exposure to chloride-rich environments can cause surface staining or pitting. For marine or high-chloride settings, 316-grade stainless steel is more appropriate.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I weld these discs to mild steel or other stainless grades?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 304 SS can be TIG or MIG welded to mild steel using 309L filler rod. When welding 304 to 304, use 308L filler.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do the edges need finishing before use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Machine-cut edges are consistent but may have minor burrs. A quick pass with a deburring tool or flap disc will bring the edge to a clean finish for handled or seating-surface applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these discs suitable for food-contact or sanitary applications?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel is food-grade compatible, but the 2B mill finish is not polished. If a sanitary finish (Ra ≤ 0.8 µm) is required, the surface must be polished after purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Why does the Ø100mm disc come in a 2-piece pack while larger sizes are single pieces?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Smaller discs are frequently used in pairs for matched end caps, symmetrical mounting plates, or paired templates. Larger diameters are more often used individually, so single-piece pricing keeps cost proportional.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"Ø100mm x 1mm \/ 2 PCS","offer_id":52378946666770,"sku":"Adaah012632x1","price":17.14,"currency_code":"USD","in_stock":true},{"title":"Ø150mm x 1mm \/ 1 PCS","offer_id":52378946699538,"sku":"Adaah012633x1","price":18.66,"currency_code":"USD","in_stock":true},{"title":"Ø200mm x 1mm \/ 1 PCS","offer_id":52378946732306,"sku":"Adaah012634x1","price":29.36,"currency_code":"USD","in_stock":true},{"title":"Ø300mm x 1mm \/ 1 PCS","offer_id":52378946765074,"sku":"Adaah012635x1","price":56.02,"currency_code":"USD","in_stock":true},{"title":"Ø100mm x 1.5mm \/ 2 PCS","offer_id":52378946797842,"sku":"Adaah012636x1","price":23.66,"currency_code":"USD","in_stock":true},{"title":"Ø150mm x 1.5mm \/ 1 PCS","offer_id":52378946830610,"sku":"Adaah012637x1","price":25.66,"currency_code":"USD","in_stock":true},{"title":"Ø200mm x 1.5mm \/ 1 PCS","offer_id":52378946863378,"sku":"Adaah012638x1","price":40.92,"currency_code":"USD","in_stock":true},{"title":"Ø300mm x 1.5mm \/ 1 PCS","offer_id":52378946896146,"sku":"Adaah012639x1","price":81.94,"currency_code":"USD","in_stock":true},{"title":"Ø100mm x 2mm \/ 1 PCS","offer_id":52378946928914,"sku":"Adaah012640x1","price":17.14,"currency_code":"USD","in_stock":true},{"title":"Ø150mm x 2mm \/ 1 PCS","offer_id":52378946961682,"sku":"Adaah012641x1","price":30.18,"currency_code":"USD","in_stock":true},{"title":"Ø200mm x 2mm \/ 1 PCS","offer_id":52378946994450,"sku":"Adaah012642x1","price":50.52,"currency_code":"USD","in_stock":true},{"title":"Ø100mm x 2.5mm \/ 1 PCS","offer_id":52378947027218,"sku":"Adaah012643x1","price":20.14,"currency_code":"USD","in_stock":true},{"title":"Ø150mm x 2.5mm \/ 1 PCS","offer_id":52378947059986,"sku":"Adaah012644x1","price":36.65,"currency_code":"USD","in_stock":true},{"title":"Ø200mm x 2.5mm \/ 1 PCS","offer_id":52378947092754,"sku":"Adaah012645x1","price":61.59,"currency_code":"USD","in_stock":true},{"title":"Ø100mm x 3mm \/ 1 PCS","offer_id":52378947125522,"sku":"Adaah012646x1","price":24.04,"currency_code":"USD","in_stock":true},{"title":"Ø150mm x 3mm \/ 1 PCS","offer_id":52378947158290,"sku":"Adaah012647x1","price":30.99,"currency_code":"USD","in_stock":true},{"title":"Ø200mm x 3mm \/ 1 PCS","offer_id":52378947191058,"sku":"Adaah012648x1","price":54.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Picture1of7_c038f6b5-22c1-40d9-95f6-cf9368b224c2.jpg?v=1781685906","url":"https:\/\/homediyer.com\/products\/304-stainless-steel-round-disc-plate","provider":"HomeDIYer","version":"1.0","type":"link"}