{"product_id":"stainless-steel-sheet-bright-polish-3mm-thick-many-size-grade-a2-304-l50-450mm","title":"Stainless Steel Sheet Bright Polish 3mm Thick Many Size Grade A2 304 L50-450mm","description":"\u003cdiv class=\"hdiy-desc\"\u003e\n\n\u003cdiv class=\"hdiy-overview\"\u003e\n\u003ch2\u003e3mm Stainless Steel Sheet — Grade 304 Bright Polish, Cut-Ready for DIY \u0026amp; Fabrication\u003c\/h2\u003e\n\u003cp\u003eWhen a project demands a flat metal surface that resists rust, holds its shape under load, and looks clean straight out of the pack, most standard sheet options fall short. Whether you're a home fabricator patching a splashback, a maker building a bracket, or a tradesperson needing a quick repair plate, sourcing the right thickness and size without ordering a full sheet is a constant frustration. These 3mm stainless steel sheets are stocked in multiple cut sizes so you only buy what you need.\u003c\/p\u003e\n\u003cp\u003eEach sheet is cut from Grade 304 (A2) stainless steel — one of the most widely used corrosion-resistant alloys — and finished with a bright mirror polish on the face. Thickness is a consistent 3mm (approximately 1\/8 in). Available sizes range from 50 × 50mm (approx. 2 × 2 in) up to 450 × 450mm (approx. 17.7 × 17.7 in), with rectangular and square options across 13 size variants. Quantity packs of 1, 2, or 4 pieces are available depending on the size selected.\u003c\/p\u003e\n\u003cp\u003eTypical applications include kitchen splashback repair panels, machine guard plates, structural gussets and joining plates in light fabrication, decorative cladding on furniture or cabinetry, and flat stock for custom brackets in automotive or workshop builds. The bright polished surface also makes these sheets a practical choice for signage blanks and display fixtures where a reflective finish is required.\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 note:\u003c\/strong\u003e These sheets are undrilled flat stock. They are compatible with standard metal-cutting tools (angle grinder, jigsaw with metal blade, drill press). Suitable for welding, riveting, bolting, or adhesive bonding. Not pre-bent or pre-formed.\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-features\"\u003e\n\u003ch2\u003e✅ Key Features of These 3mm Stainless Steel Sheets\u003c\/h2\u003e\n\u003cdiv class=\"hdiy-list\"\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔬\u003c\/span\u003e\u003cstrong\u003eGrade 304 (A2) Alloy\u003c\/strong\u003e — Contains 18% chromium and 8% nickel, giving strong resistance to oxidation, moisture, and mild acids without surface treatment.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e✨\u003c\/span\u003e\u003cstrong\u003eBright Mirror Polish Finish\u003c\/strong\u003e — Face side is machine-polished to a reflective finish, reducing surface roughness and making the sheet easier to wipe clean in food-contact or hygiene-sensitive environments.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📏\u003c\/span\u003e\u003cstrong\u003eConsistent 3mm Thickness\u003c\/strong\u003e — Uniform gauge across the full sheet area, suitable for structural repair plates, gussets, and load-bearing brackets where dimensional accuracy matters.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🗂️\u003c\/span\u003e\u003cstrong\u003e13 Size Options in One Listing\u003c\/strong\u003e — From 50 × 50mm up to 450 × 450mm, including rectangular cuts (e.g. 200 × 100mm, 400 × 300mm), so you can match the sheet to your project without cutting waste.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e📦\u003c\/span\u003e\u003cstrong\u003eFlexible Quantity Packs\u003c\/strong\u003e — Smaller sizes are available in packs of 2 or 4 for multi-piece jobs; larger sizes are sold individually. Select the quantity that matches your build requirement.\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"hdiy-icon\"\u003e🔧\u003c\/span\u003e\u003cstrong\u003eReady to Cut, Drill, or Weld\u003c\/strong\u003e — Flat stock with no pre-drilled holes or bends. Compatible with standard metalworking tools and processes including MIG\/TIG welding, drilling, grinding, and mechanical fastening.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-table-wrap\"\u003e\n\u003ch2\u003e📐 Technical Specifications — Stainless Steel Sheet\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eGrade 304 Stainless Steel (A2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinish\u003c\/th\u003e\n\u003ctd\u003eBright Mirror Polish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThickness\u003c\/th\u003e\n\u003ctd\u003e3mm (approx. 1\/8 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAvailable Sizes (L × W)\u003c\/th\u003e\n\u003ctd\u003e50×50, 100×50, 100×100, 150×150, 200×100, 200×200, 250×250, 300×200, 300×300, 350×350, 400×300, 400×400, 450×450 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eQuantity Options\u003c\/th\u003e\n\u003ctd\u003e1, 2, or 4 pieces (varies by size — see variant options)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eChromium Content\u003c\/th\u003e\n\u003ctd\u003eTypically 17.5–19.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNickel Content\u003c\/th\u003e\n\u003ctd\u003eTypically 8–10.5%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTensile Strength\u003c\/th\u003e\n\u003ctd\u003eTypically 515–720 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSurface\u003c\/th\u003e\n\u003ctd\u003ePolished face; reverse side may be mill finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePre-drilled Holes\u003c\/th\u003e\n\u003ctd\u003eNone — flat undrilled stock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight per Sheet\u003c\/th\u003e\n\u003ctd\u003eSee variant options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeldability\u003c\/th\u003e\n\u003ctd\u003eCompatible with MIG and TIG welding processes\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\u003cdetails\u003e\n\u003csummary\u003eWhat size should I choose for a splashback repair patch?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eMeasure the damaged or exposed area and add at least 10–15mm overlap on each edge for a secure fit. For example, a 120 × 90mm gap would be well covered by the 200 × 100mm sheet. If the area is irregular, choose the next size up and trim with an angle grinder or metal-cutting jigsaw blade.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs 3mm thick stainless steel strong enough for a structural bracket or gusset?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eFor light to medium-duty applications — such as joining plates, corner gussets on furniture frames, or support brackets carrying static loads under approximately 50–80 kg — 3mm Grade 304 sheet provides adequate rigidity. For dynamic loads, impact-prone environments, or heavy structural use, consult an engineer and consider thicker stock.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWill this sheet rust or corrode outdoors?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eGrade 304 stainless steel offers good resistance to atmospheric corrosion and moisture in most outdoor environments. It is not fully immune — prolonged exposure to salt spray (coastal environments) or industrial chloride-rich atmospheres can cause surface staining over time. For marine or highly corrosive environments, Grade 316 is typically recommended instead.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I cut these sheets with standard DIY tools?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. A 4.5-inch angle grinder with a stainless-rated cutting disc, a jigsaw fitted with a bi-metal or carbide blade, or a drill press with HSS-Co (cobalt) drill bits will all work on 3mm 304 sheet. Use cutting fluid or lubricant when drilling to extend bit life and reduce heat buildup. Avoid using carbon steel tools that may leave iron deposits and cause surface rust spots.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these sheets compatible with welding?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eYes. Grade 304 stainless steel is readily weldable using TIG (GTAW) or MIG (GMAW) processes with appropriate 308L or 309L filler wire. Ensure the work area is clean and free of contaminants. Post-weld passivation or pickling is recommended if the finished joint will be exposed to moisture to restore the passive oxide layer.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I choose between the square and rectangular size options?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eSquare sizes (e.g. 100×100, 200×200) suit applications where equal coverage in both directions is needed — base plates, decorative tiles, or symmetrical patches. Rectangular sizes (e.g. 200×100, 400×300) are better for elongated openings, shelf brackets, or joining plates where one dimension is significantly longer. If your project falls between two sizes, always size up — it is easier to trim than to extend.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the bright polish finish affect how I clean or maintain the sheet?\u003c\/summary\u003e\n\u003cdiv class=\"hdiy-faq-body\"\u003e\u003cp\u003eThe polished surface is easier to wipe down than a brushed or mill finish because it has lower surface roughness, giving bacteria and grime fewer places to adhere. Clean with a damp cloth and mild detergent. Avoid abrasive scourers or steel wool, which can scratch the polish and introduce iron particles. For stubborn marks, a dedicated stainless steel cleaner applied along the grain direction works best.\u003c\/p\u003e\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"hdiy-cta\"\u003e\n🛒 Select your size and 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 size should I choose for a splashback repair patch?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Measure the damaged or exposed area and add at least 10–15mm overlap on each edge for a secure fit. For example, a 120 × 90mm gap would be well covered by the 200 × 100mm sheet. If the area is irregular, choose the next size up and trim with an angle grinder or metal-cutting jigsaw blade.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is 3mm thick stainless steel strong enough for a structural bracket or gusset?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"For light to medium-duty applications — such as joining plates, corner gussets on furniture frames, or support brackets carrying static loads under approximately 50–80 kg — 3mm Grade 304 sheet provides adequate rigidity. For dynamic loads, impact-prone environments, or heavy structural use, consult an engineer and consider thicker stock.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Will this sheet rust or corrode outdoors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Grade 304 stainless steel offers good resistance to atmospheric corrosion and moisture in most outdoor environments. It is not fully immune — prolonged exposure to salt spray (coastal environments) or industrial chloride-rich atmospheres can cause surface staining over time. For marine or highly corrosive environments, Grade 316 is typically recommended instead.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I cut these sheets with standard DIY tools?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. A 4.5-inch angle grinder with a stainless-rated cutting disc, a jigsaw fitted with a bi-metal or carbide blade, or a drill press with HSS-Co (cobalt) drill bits will all work on 3mm 304 sheet. Use cutting fluid or lubricant when drilling to extend bit life and reduce heat buildup.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these sheets compatible with welding?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Grade 304 stainless steel is readily weldable using TIG (GTAW) or MIG (GMAW) processes with appropriate 308L or 309L filler wire. Post-weld passivation or pickling is recommended if the finished joint will be exposed to moisture.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I choose between the square and rectangular size options?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Square sizes suit applications where equal coverage in both directions is needed. Rectangular sizes are better for elongated openings or joining plates where one dimension is significantly longer. If your project falls between two sizes, always size up — it is easier to trim than to extend.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the bright polish finish affect how I clean or maintain the sheet?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The polished surface is easier to wipe down than a brushed or mill finish. Clean with a damp cloth and mild detergent. Avoid abrasive scourers or steel wool. For stubborn marks, a dedicated stainless steel cleaner applied along the grain direction works best.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"HomeDIYer","offers":[{"title":"50mm X 50mm X 3mm \/ 4","offer_id":52379017838866,"sku":"WWLFABGQJDWW94x1","price":31.43,"currency_code":"USD","in_stock":true},{"title":"100mm X 50mm X 3mm \/ 2","offer_id":52379017871634,"sku":"WWLFABGQJDWW95x1","price":31.63,"currency_code":"USD","in_stock":true},{"title":"100mm X 100mm X 3mm \/ 2","offer_id":52379017904402,"sku":"WWLFABGQJDWW96x1","price":56.97,"currency_code":"USD","in_stock":true},{"title":"200mm X 100mm X 3mm \/ 1","offer_id":52379017937170,"sku":"WWLFABGQJDWW97x1","price":54.41,"currency_code":"USD","in_stock":true},{"title":"200mm X 200mm X 3mm \/ 1","offer_id":52379017969938,"sku":"WWLFABGQJDWW98x1","price":104.39,"currency_code":"USD","in_stock":true},{"title":"300mm X 200mm X 3mm \/ 1","offer_id":52379018002706,"sku":"WWLFABGQJDWW99x1","price":149.06,"currency_code":"USD","in_stock":true},{"title":"300mm X 300mm X 3mm \/ 1","offer_id":52379018035474,"sku":"WWLFABGQJDWW100x1","price":221.26,"currency_code":"USD","in_stock":true},{"title":"400mm X 300mm X 3mm \/ 1","offer_id":52379018068242,"sku":"WWLFABGQJDWW101x1","price":293.47,"currency_code":"USD","in_stock":true},{"title":"400mm X 400mm X 3mm \/ 1","offer_id":52379018101010,"sku":"WWLFABGQJDWW102x1","price":389.57,"currency_code":"USD","in_stock":true},{"title":"150mm X 150mm X 3mm \/ 1","offer_id":52379018133778,"sku":"WWLFABGQJDWW103x1","price":58.38,"currency_code":"USD","in_stock":true},{"title":"250mm X 250mm X 3mm \/ 1","offer_id":52379018166546,"sku":"WWLFABGQJDWW104x1","price":155.01,"currency_code":"USD","in_stock":true},{"title":"350mm X 350mm X 3mm \/ 1","offer_id":52379018199314,"sku":"WWLFABGQJDWW105x1","price":300.0,"currency_code":"USD","in_stock":true},{"title":"450mm X 450mm X 3mm \/ 1","offer_id":52379018232082,"sku":"WWLFABGQJDWW106x1","price":491.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0884\/8936\/1682\/files\/Main-01_513aa6fd-1665-4037-9358-851afcd8d7ec.jpg?v=1781770057","url":"https:\/\/homediyer.com\/de\/products\/stainless-steel-sheet-bright-polish-3mm-thick-many-size-grade-a2-304-l50-450mm","provider":"HomeDIYer","version":"1.0","type":"link"}