{"product_id":"stainless-steel-blank-round-disc-304-grade-20-100mm","title":"Ø 20-100mm Stainless Steel Blank Round Disc 304 Grade Metal Sheet Thick 20\/30mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e304 Stainless Steel Blank Round Discs — Precision-Cut Metal Blanks for DIY \u0026amp; Fabrication\u003c\/h2\u003e\n\u003cp\u003eWhen your project demands a flat, burr-free metal blank that holds its shape under load, finding the right stainless steel round disc in the exact diameter and thickness can be frustrating. These 304-grade stainless steel blank round discs are designed for makers, fabricators, and engineers who need a reliable starting point — whether you're cutting, drilling, welding, or finishing to spec.\u003c\/p\u003e\n\u003cp\u003eEach disc is cut from 304-grade stainless steel sheet stock, offering a balanced combination of corrosion resistance, weldability, and machinability. Available in outer diameters from 20mm (~0.79 in) to 100mm (~3.94 in), with thickness options of 20mm (~0.79 in) or 30mm (~1.18 in) depending on the size selected. The flat, unfinished surface is ready for secondary operations including grinding, polishing, engraving, or coating.\u003c\/p\u003e\n\u003cp\u003eTypical applications include custom flanges and backing plates for plumbing or HVAC work, base plates for welded assemblies, blanks for metal stamping and engraving projects, and structural spacers or shims in mechanical assemblies. The consistent 304 alloy composition makes these discs a dependable choice for both indoor and outdoor use where mild corrosive exposure is expected.\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 metalworking tools including angle grinders, drill presses, MIG\/TIG welders, and bench grinders. Suitable for use with 304-compatible cutting fluids and abrasives.\u003c\/div\u003e\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 304 Stainless Steel Blank Round Discs\u003c\/h2\u003e\n\u003cul class=\"hdiy-list\"\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔩\u003c\/span\u003e \u003cstrong\u003e304-Grade Stainless Steel Alloy\u003c\/strong\u003e — Contains 18% chromium and 8% nickel for reliable corrosion resistance in wet, humid, and mildly acidic environments without surface treatment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e \u003cstrong\u003eWide Diameter Range: 20mm to 100mm\u003c\/strong\u003e — 22 size combinations covering diameters from 20mm to 100mm and thicknesses of 20mm or 30mm, reducing the need for custom cutting on most standard projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e⚖️\u003c\/span\u003e \u003cstrong\u003eConsistent Thickness Tolerance\u003c\/strong\u003e — Each disc is cut to a uniform thickness (20mm or 30mm depending on variant), ensuring flat, parallel faces suitable for load-bearing and precision-fit applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🛠️\u003c\/span\u003e \u003cstrong\u003eMachinable \u0026amp; Weldable Surface\u003c\/strong\u003e — The unfinished blank surface accepts drilling, tapping, grinding, and MIG\/TIG welding without pre-treatment, saving prep time on the workbench.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔄\u003c\/span\u003e \u003cstrong\u003eVersatile Use Across Trades\u003c\/strong\u003e — Suited for plumbing flanges, mechanical spacers, engraving blanks, art fabrication bases, and structural backing plates across DIY and professional trades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e \u003cstrong\u003eSold Individually per Variant\u003c\/strong\u003e — Each listing is for one disc in the selected Diameter × Thickness combination, so you order exactly what you need without paying for unused sizes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Stainless Steel Round Disc\u003c\/h2\u003e\n\u003ctable\u003e\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\u003eOuter Diameter Range\u003c\/th\u003e\n\u003ctd\u003e20mm – 100mm (0.79 in – 3.94 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThickness Options\u003c\/th\u003e\n\u003ctd\u003e20mm (0.79 in) or 30mm (1.18 in) — see variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface Finish\u003c\/th\u003e\n\u003ctd\u003eMill finish (unpolished blank)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShape\u003c\/th\u003e\n\u003ctd\u003eFlat round disc, no center hole\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\u003e8.0–10.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 515 MPa (74,700 psi) min.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHardness\u003c\/th\u003e\n\u003ctd\u003eTypically ≤ 201 HB (Brinell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003e1 piece per order\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Operations\u003c\/th\u003e\n\u003ctd\u003eDrilling, grinding, welding, engraving, polishing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\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\u003csummary\u003eHow do I choose the right diameter and thickness for my project?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSelect the outer diameter that matches or slightly exceeds your target finished size — you can always remove material by grinding or turning, but you cannot add it. For thickness, 20mm discs suit most spacer, flange, and backing plate applications. Choose 30mm when you need additional structural depth, such as for heavy-load bearing plates or deep-engraving blanks where material removal is significant.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs 304 stainless steel strong enough for structural or load-bearing use?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 stainless steel has a minimum tensile strength of approximately 515 MPa and a yield strength of around 205 MPa, making it suitable for moderate structural applications such as mounting plates, flanges, and mechanical spacers. For high-stress or impact-critical applications, consult an engineer to confirm the grade meets your load requirements.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWill these discs rust or corrode outdoors?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003e304 stainless steel provides good corrosion resistance in most outdoor and humid environments due to its chromium oxide passive layer. It performs well in rain, moisture, and mild chemical exposure. However, in coastal or chloride-rich environments (such as near saltwater), surface staining or pitting can occur over time. For marine-grade corrosion resistance, consider 316 stainless steel instead.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre these discs compatible with MIG or TIG welding?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 304 stainless steel is one of the most commonly welded stainless alloys. It is compatible with both MIG (using ER308L wire) and TIG welding processes. The mill-finish blank surface requires no special pre-treatment before welding, though standard cleaning with acetone or stainless-specific cleaner is recommended to remove any handling oils.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eCan I drill or tap threads into these discs?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. 304 stainless steel is machinable with standard HSS or carbide tooling. Use a cutting fluid or tapping oil to extend tool life and achieve cleaner threads. Drill speeds should be lower than for mild steel — typically 30–50% slower — to prevent work hardening. Pilot holes are recommended before tapping to reduce torque and improve thread quality.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhat is the difference between the 20mm and 30mm thickness variants?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe 20mm thick discs are the lighter option, suited for applications where weight is a consideration or where the disc serves as a surface plate, backing washer, or thin flange. The 30mm thick discs provide greater depth for applications requiring more material — such as deep-drilled holes, heavy-duty spacers, or engraving blanks where significant stock removal is planned. Note that not all diameters are available in both thicknesses; check the variant selector for available combinations.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eDo these discs have a center hole or are they solid blanks?\u003c\/summary\u003e\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThese are solid blank discs with no pre-drilled center hole. This makes them suitable as a starting blank for any custom hole pattern, including center holes, bolt circles, or off-center bores. You drill or cut the holes to your exact specification using standard metalworking equipment.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hdiy-cta\"\u003e🛒 Select your Diameter × Thickness above, then add to cart.\u003c\/div\u003e\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 and thickness for my project?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Select the outer diameter that matches or slightly exceeds your target finished size. For thickness, 20mm discs suit most spacer, flange, and backing plate applications. Choose 30mm when you need additional structural depth, such as for heavy-load bearing plates or deep-engraving blanks.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 304 stainless steel strong enough for structural or load-bearing use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel has a minimum tensile strength of approximately 515 MPa and a yield strength of around 205 MPa, making it suitable for moderate structural applications such as mounting plates, flanges, and mechanical spacers.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will these discs rust or corrode outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"304 stainless steel provides good corrosion resistance in most outdoor and humid environments. It performs well in rain, moisture, and mild chemical exposure. In coastal or chloride-rich environments, surface staining or pitting can occur over time.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these discs compatible with MIG or TIG welding?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 304 stainless steel is compatible with both MIG (using ER308L wire) and TIG welding processes. The mill-finish blank surface requires no special pre-treatment before welding.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I drill or tap threads into these discs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 304 stainless steel is machinable with standard HSS or carbide tooling. Use a cutting fluid or tapping oil, and drill at 30–50% slower speeds than mild steel to prevent work hardening.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between the 20mm and 30mm thickness variants?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 20mm thick discs suit surface plates, backing washers, and thin flanges. The 30mm thick discs provide greater depth for heavy-duty spacers or engraving blanks. Not all diameters are available in both thicknesses.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Do these discs have a center hole or are they solid blanks?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"These are solid blank discs with no pre-drilled center hole, suitable as a starting blank for any custom hole pattern including center holes, bolt circles, or off-center bores.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"20mm × 20mm","offer_id":52379008532754,"sku":"WBJHHZBLN034MEN687x1","price":10.74,"currency_code":"USD","in_stock":true},{"title":"25mm × 20mm","offer_id":52379008565522,"sku":"WBJHHZBLN034MEN688x1","price":13.67,"currency_code":"USD","in_stock":true},{"title":"30mm × 20mm","offer_id":52379008598290,"sku":"WBJHHZBLN034MEN689x1","price":17.34,"currency_code":"USD","in_stock":true},{"title":"30mm × 30mm","offer_id":52379008631058,"sku":"WBJHHZBLN034MEN690x1","price":23.05,"currency_code":"USD","in_stock":true},{"title":"35mm × 20mm","offer_id":52379008663826,"sku":"WBJHHZBLN034MEN691x1","price":22.1,"currency_code":"USD","in_stock":true},{"title":"35mm × 30mm","offer_id":52379008696594,"sku":"WBJHHZBLN034MEN692x1","price":30.26,"currency_code":"USD","in_stock":true},{"title":"40mm × 20mm","offer_id":52379008729362,"sku":"WBJHHZBLN034MEN693x1","price":27.06,"currency_code":"USD","in_stock":true},{"title":"45mm × 20mm","offer_id":52379008762130,"sku":"WBJHHZBLN034MEN694x1","price":32.5,"currency_code":"USD","in_stock":true},{"title":"50mm × 20mm","offer_id":52379008794898,"sku":"WBJHHZBLN034MEN695x1","price":41.89,"currency_code":"USD","in_stock":true},{"title":"55mm × 20mm","offer_id":52379008827666,"sku":"WBJHHZBLN034MEN696x1","price":52.56,"currency_code":"USD","in_stock":true},{"title":"55mm × 30mm","offer_id":52379008860434,"sku":"WBJHHZBLN034MEN697x1","price":84.46,"currency_code":"USD","in_stock":true},{"title":"60mm × 20mm","offer_id":52379008893202,"sku":"WBJHHZBLN034MEN698x1","price":67.66,"currency_code":"USD","in_stock":true},{"title":"60mm × 30mm","offer_id":52379008925970,"sku":"WBJHHZBLN034MEN699x1","price":98.74,"currency_code":"USD","in_stock":true},{"title":"70mm × 20mm","offer_id":52379008958738,"sku":"WBJHHZBLN034MEN700x1","price":87.86,"currency_code":"USD","in_stock":true},{"title":"75mm × 20mm","offer_id":52379008991506,"sku":"WBJHHZBLN034MEN701x1","price":99.69,"currency_code":"USD","in_stock":true},{"title":"75mm × 30mm","offer_id":52379009024274,"sku":"WBJHHZBLN034MEN702x1","price":148.51,"currency_code":"USD","in_stock":true},{"title":"80mm × 20mm","offer_id":52379009057042,"sku":"WBJHHZBLN034MEN703x1","price":110.7,"currency_code":"USD","in_stock":true},{"title":"80mm × 30mm","offer_id":52379009089810,"sku":"WBJHHZBLN034MEN704x1","price":166.94,"currency_code":"USD","in_stock":true},{"title":"85mm × 20mm","offer_id":52379009122578,"sku":"WBJHHZBLN034MEN705x1","price":128.11,"currency_code":"USD","in_stock":true},{"title":"95mm × 20mm","offer_id":52379009155346,"sku":"WBJHHZBLN034MEN706x1","price":155.72,"currency_code":"USD","in_stock":true},{"title":"100mm × 20mm","offer_id":52379009188114,"sku":"WBJHHZBLN034MEN707x1","price":170.2,"currency_code":"USD","in_stock":true},{"title":"100mm × 30mm","offer_id":52379009220882,"sku":"WBJHHZBLN034MEN708x1","price":243.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_69829fcb-bcc9-4412-b671-63d896f2d0d8.jpg?v=1781700936","url":"https:\/\/homediyer.com\/products\/stainless-steel-blank-round-disc-304-grade-20-100mm","provider":"HomeDIYer","version":"1.0","type":"link"}