{"product_id":"mirka-bulldog-gold-5-in-400-grit-5-hole-psa-sanding-disc-23-321-400","title":"Mirka Bulldog Gold 5-in. 400 Grit 5-Hole PSA Sanding Disc (23-321-400)","description":"\u003csection data-aplus\u003e\n  \u003cdetails id=\"product-features\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"features\"\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/grit-range.svg\" alt=\"grit-range\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003e400 Grit Finish\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eBuilt for fine sanding where surface quality matters. The 400 grit cut helps refine scratches and prep for the next finishing step without getting overly aggressive.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/material.svg\" alt=\"material\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eDurable Aluminum Oxide\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eThe aluminum oxide abrasive is made to cut fast and hold up. Combined with resin bonding, it gives the disc better grain support for longer usable life.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/vacuum-compatibility.svg\" alt=\"vacuum-compatibility\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003e5-Hole PSA Vacuum Disc\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eThis Mirka sanding disc uses a pressure sensitive adhesive backing and 5-hole pattern for dust extraction. That means quick disc changes and better resistance to loading during longer sanding sessions.\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-overview\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eOverview\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\" data-product-summary\u003e\n      \u003cp\u003e\u003cstrong\u003eMirka 23-321-400 Bulldog Gold 5-Inch 5-hole PSA Vacuum Disc 400 Grit\u003c\/strong\u003e is a 5-inch abrasive disc for sanders that use a pressure sensitive adhesive backing. This is a sanding disc designed for fine finishing and controlled stock removal on compatible 5-inch PSA vacuum sanders. Model Number: \u003cstrong\u003e23-321-400\u003c\/strong\u003e. If you need a finer grit disc that still cuts consistently and holds up through repeated passes, this is the kind of abrasive that makes sense.\u003c\/p\u003e\n      \u003cp\u003eThe big story here is the 400 grit rating paired with Mirka's Bulldog Gold abrasive design. That combination makes it a good fit for refining a surface, evening out previous sanding marks, and getting material ready for finishing steps where a rough scratch pattern will show. It is not a coarse rip-down disc. It is for the stage where consistency matters and you want a more controlled result.\u003c\/p\u003e\n      \u003cp\u003eMirka uses durable aluminum oxide grain, which is a proven abrasive for general sanding across wood, fillers, primers, and other common shop materials. The resin bonding supports the grain so the disc keeps cutting instead of falling off too quickly. In practical terms, that means less wasted paper and fewer disc changes when you are working through a box on repetitive prep work.\u003c\/p\u003e\n      \u003cp\u003eThis Bulldog Gold disc also uses a semi-open coat and a stearate coating to help resist clogging and loading. That matters because loaded discs stop cutting cleanly, run hotter, and leave a less consistent finish. If you spend time sanding surfaces that can gum up abrasives, that anti-load design helps the disc stay useful longer and maintain a more even scratch pattern.\u003c\/p\u003e\n      \u003cp\u003eThe 5-hole vacuum pattern is there for dust extraction when used with the right sanding setup. Better dust pull means cleaner sanding, less buildup on the disc face, and better visibility on the work. The pressure sensitive adhesive backing also makes setup straightforward. Stick it on, line up the holes, and get back to work without dealing with hook and loop wear or a loose fit on the pad.\u003c\/p\u003e\n      \u003cp\u003eFor compatibility, this disc is intended for 5-inch PSA sanders and is listed as fitting tools such as the DeWalt DC421 and DC423, along with certain 5-inch Ryobi and Bosch 3107 and 3725 models. That is an important detail because PSA discs need the right pad style, not just the right diameter. If your sander uses a 5-inch PSA pad and a 5-hole vacuum pattern, this disc is built around that format.\u003c\/p\u003e\n      \u003cp\u003eThis product comes packed 100 discs per box, which makes it a practical buy for shops and repeat users rather than someone looking for a handful of discs for one weekend project. If you do finish sanding regularly and want a known abrasive from a brand with a strong reputation in surface prep, this is a solid fit. It makes the most sense for users who care about a clean finish, repeatable cut, and less downtime from clogged discs.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits-1\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eBuilt for Consistent Fine Sanding\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/cdn.anglera.com\/assets\/74d6ed76-fe0d-4d23-a9db-1f8749ca9ef2\/20260624342_4.jpg\" alt=\"Mirka 23-321-400 Bulldog Gold 5-Inch 5-hole PSA Vacuum Disc 400 Grit stacked for shop sanding work on a 5 inch vacuum sander\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eWhen you are sanding for surface quality instead of brute removal, the disc has to cut evenly from the first pass to the last. This 400 grit Bulldog Gold disc is made for that stage of the job where scratch pattern control matters.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e400 grit for finer finishing and surface refinement\u003c\/li\u003e\n            \u003cli\u003eUniform semi-open coat helps produce a more consistent scratch pattern\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits-2\" class=\"acc flip\"\u003e\n    \u003csummary\u003e\u003ch2\u003eLonger Life, Less Loading\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/cdn.anglera.com\/assets\/74d6ed76-fe0d-4d23-a9db-1f8749ca9ef2\/20260624342_3.jpg\" alt=\"Mirka Bulldog Gold 5 inch 5 hole PSA vacuum discs in box for finish sanding and production surface prep\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eA disc that clogs early costs time and leaves a rougher result. Mirka's stearate coating and resin-bonded aluminum oxide grain are there to keep the abrasive working longer and cutting cleaner.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003eAnti-load stearate coating helps resist clogging during sanding\u003c\/li\u003e\n            \u003cli\u003eHigh-strength resin bonding improves grain support and durability\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits-3\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eMade for PSA Vacuum Sanders\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/cdn.anglera.com\/assets\/74d6ed76-fe0d-4d23-a9db-1f8749ca9ef2\/20260624342_1.jpg\" alt=\"Mirka 23-321-400 Bulldog Gold 5-Inch 5-hole PSA Vacuum Disc 400 Grit with packaging for 5 inch PSA dust-extraction sanding systems\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eThe right abrasive needs more than the right diameter. This disc uses a pressure sensitive adhesive backing and 5-hole layout, so it is meant for specific 5-inch PSA sander pads with dust extraction.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e5-inch diameter for compatible sanding pads\u003c\/li\u003e\n            \u003cli\u003e5-hole vacuum pattern supports dust collection on matching tools\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-whats-included\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tnincluded-wrapper\"\u003e\n        \u003cul\u003e\n          \u003cli\u003e(100) Mirka Bulldog Gold 5-Inch 5-hole PSA Vacuum Discs, 400 Grit\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-key-specifications\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003ctable class=\"aplusspecs\"\u003e\n        \u003ctr\u003e\n          \u003cth\u003eDiameter\u003c\/th\u003e\n          \u003ctd\u003e5 in\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eHole Pattern\u003c\/th\u003e\n          \u003ctd\u003e5-hole\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eAttachment Type\u003c\/th\u003e\n          \u003ctd\u003ePSA (Pressure Sensitive Adhesive)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eGrit\u003c\/th\u003e\n          \u003ctd\u003e400\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eAbrasive Material\u003c\/th\u003e\n          \u003ctd\u003eAluminum Oxide\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eConstruction\u003c\/th\u003e\n          \u003ctd\u003eCoated\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003ePiece Count\u003c\/th\u003e\n          \u003ctd\u003e100\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eDimensions\u003c\/th\u003e\n          \u003ctd\u003e5 in x 5 in\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-compatibility\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"compat-list\"\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/sander.svg\" alt=\"sander\" class=\"aplusicon\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eSander Type\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eDesigned for 5-inch sanders that use a PSA pad and 5-hole vacuum pattern.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/vacuum-compatibility.svg\" alt=\"vacuum-compatibility\" class=\"aplusicon\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eDust Extraction\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003e5-hole vacuum disc layout for use with matching dust-extraction sanding setups.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/specs.svg\" alt=\"specs\" class=\"aplusicon\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eListed Tool Fit\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eListed to fit DeWalt DC421 and DC423, plus certain 5-inch Ryobi and Bosch 3107 and 3725 models.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-applications-uses\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eBuilt For\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tags\"\u003e\n        \u003cspan class=\"tag\"\u003eFinish Sanding\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eSurface Preparation\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eWoodworking\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eRefining Scratch Patterns\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eDust-Extracted Sanding\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eProduction Shop Use\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-pro-tips\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003ePro Tip\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tip-row\"\u003e\n        \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/specs.svg\" alt=\"specs\" class=\"aplusicon\"\u003e\n        \u003cp class=\"tip-text\"\u003eBefore sticking on a new PSA disc, wipe the sander pad clean and line up all five holes carefully. A clean pad gives the adhesive a flat bond, and proper hole alignment helps the disc run cooler and load up less.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-tool-nut-take\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eTool Nut's Take\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"eyebrow\"\u003eTool Nut's Take\u003c\/div\u003e\n      \u003ch3\u003eMirka 23-321-400 Bulldog Gold 5-Inch 5-hole PSA Vacuum Disc 400 Grit is a smart buy for finish work that needs consistency\u003c\/h3\u003e\n      \u003cp\u003eThis is the kind of abrasive you buy when you care more about a clean, repeatable finish than just chewing material off fast.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWho it's for:\u003c\/strong\u003e Shops and serious users running compatible 5-inch PSA vacuum sanders for finish sanding and surface prep.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhy it stands out:\u003c\/strong\u003e The aluminum oxide grain, resin bonding, and anti-load coating all work toward the same goal: a disc that keeps cutting clean and stays useful longer.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWorth knowing:\u003c\/strong\u003e Make sure your sander uses PSA discs, not hook and loop, and check the 5-hole pattern before you order.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-faqs\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCommon Questions\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhat type of sander does this disc fit?\u003c\/strong\u003e It is designed for 5-inch sanders that use a PSA backing and a 5-hole vacuum pattern.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhat is the abrasive material?\u003c\/strong\u003e This disc uses aluminum oxide abrasive grain.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIs this a fine or coarse sanding disc?\u003c\/strong\u003e With a 400 grit rating, it is on the fine side and is better suited for finishing and surface refinement than aggressive removal.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDoes this disc help reduce clogging?\u003c\/strong\u003e Yes. It uses a stearate coating that is intended to improve resistance to clogging and loading during sanding.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e","brand":"Mirka","offers":[{"title":"Default Title","offer_id":53385942139174,"sku":"23-321-400-MIRKA","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/20260624342_1.jpg?v=1782171975","url":"https:\/\/www.toolnut.com\/products\/mirka-bulldog-gold-5-in-400-grit-5-hole-psa-sanding-disc-23-321-400","provider":"Tool Nut","version":"1.0","type":"link"}