{"product_id":"mirka-5-in-320-grit-psa-sanding-discs-5-hole-dust-free-100-pack-23-321-320","title":"Mirka 5-in. 320 Grit PSA Sanding Discs, 5-Hole Dust-Free, 100-Pack (23-321-320)","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\u003eFine P320 Finish\u003c\/strong\u003e\u003c\/div\u003e\n        \u003cdiv class=\"feature-card\"\u003eThe P320 grit is built for fine finish sanding when you need a smoother surface before final coating or between finish steps.\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 Dust Control\u003c\/strong\u003e\u003c\/div\u003e\n        \u003cdiv class=\"feature-card\"\u003eThe 5-hole pattern is made for sanders with matching perforated pads, helping pull dust away from the work surface so the disc keeps cutting cleaner.\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\"\u003eMirka uses sharp aluminum oxide abrasive for fast, consistent sanding with good disc life, especially when you are doing larger batches of finish work.\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 23-321-320 5 in. 5-Hole P320 PSA Sanding Discs\u003c\/strong\u003e are adhesive-backed sanding discs sold in a 100-pack for fine finish sanding with compatible 5-inch sanders. This is a PSA sanding disc set designed for finish sanding on a matching 5-hole pad. Model Number: 23-321-320. If you need a finer grit for surface prep, finish leveling, or the last passes before coating, this pack gives you the quantity and consistency to keep moving without constantly swapping brands or grit lines.\u003c\/p\u003e\n    \u003cp\u003eThe big selling point here is the P320 grit. That is firmly in fine-sanding territory, which makes it useful when aggressive stock removal is already done and the goal shifts to refining the surface. On the job, that means fewer deep scratch marks to chase later and a better starting point for paint, clear, or other finish work. For wood, metal, and other surfaces that need a cleaner final prep step, that matters more than raw cutting speed.\u003c\/p\u003e\n    \u003cp\u003eMirka builds these discs with aluminum oxide abrasive, and that is a practical choice for day-to-day sanding because it balances cut quality, durability, and value. The open-coat construction and resin-over-glue bonding called out in the product data are not just technical filler. They help the abrasive stay usable longer and keep the disc from loading up as quickly during extended sanding sessions. When you are burning through discs on repetitive prep work, that translates into less downtime and more predictable results.\u003c\/p\u003e\n    \u003cp\u003eThe 5-inch diameter and 5-hole pattern make these a fit for sanders using that common size and hole layout. The hole pattern is there for a reason: it supports dust extraction when paired with a perforated pad, which helps the abrasive stay clearer and the surface stay more visible while you work. Less dust trapped under the disc usually means a more even finish and less chance of grinding loose debris back into the material.\u003c\/p\u003e\n    \u003cp\u003eAttachment is PSA, which means pressure-sensitive adhesive backing. For the right user, that is simple and secure. You get a firm stick to the pad without dealing with hook-and-loop wear, and the disc stays planted during sanding. The tradeoff is that you need a compatible PSA backup pad, so this is best for users already set up around that system rather than someone looking for universal hook-and-loop discs.\u003c\/p\u003e\n    \u003cp\u003eCompatibility data specifically lists Porter Cable 334 and 7335 sanders with a perforated pad, which gives buyers a clear reference point. More broadly, these Mirka sanding discs are aimed at users running a 5-inch PSA sanding setup and wanting a finer grit for finish work, touch-up prep, or smoothing between sanding stages. If that is your workflow, a 100-count box makes a lot more sense than buying small mixed packs and hoping they hold up the same from disc to disc.\u003c\/p\u003e\n    \u003cp\u003eWho should buy these? Anyone doing repeat finish sanding with a compatible 5-inch PSA sander. That includes woodworkers, cabinet shops, finish carpenters, auto body prep users, and serious DIYers who already know they want P320 specifically. If you need one grit that sits in the finer end of the sanding process and you want a known abrasive brand instead of bargain-bin paper, this is the kind of consumable that keeps your finish process consistent.\u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails id=\"product-benefits\" class=\"acc\"\u003e\n  \u003csummary\u003e\u003ch2\u003eFine Sanding Without Guesswork\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\/20260624341_1.jpg\" alt=\"Mirka 23-321-320 5 inch 5-hole PSA sanding discs stacked for finish sanding work on a compatible random orbit sander pad in a shop setting\" class=\"tnblock-img\"\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"copy\"\u003e\n        \u003cp\u003eWhen you already know you need a fine grit, a full box of matching discs keeps the finish stage predictable. That is the real value here: same cut, same backing, same hole pattern every time you grab a new disc.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003eP320 grit for fine surface prep and finish sanding\u003c\/li\u003e\n          \u003cli\u003e100 discs per box for production work or regular shop use\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\u003eBuilt Around Dust Extraction\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\/20260624341_2.jpg\" alt=\"Mirka 23-321-320 5 inch 5-hole PSA sanding disc next to box packaging for dust-managed finish sanding with a perforated pad\" class=\"tnblock-img\"\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"copy\"\u003e\n        \u003cp\u003eThe 5-hole layout matters if you are trying to keep the disc cutting clean instead of skating on packed dust. Pair these with a matching perforated backup pad and you get a cleaner sanding pattern and better visibility on the surface.\u003c\/p\u003e\n        \u003cul\u003e\n          \u003cli\u003e5-hole pattern supports dust removal through the pad\u003c\/li\u003e\n          \u003cli\u003eCompatible reference listed for Porter Cable 334 and 7335 with perforated pad\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 5 in. 5-hole PSA sanding discs, P320 grit\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"included-note\"\u003e\n      \u003cp\u003eSander and backup pad are not included.\u003c\/p\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\u003eDisc Diameter\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\u003eBacking Type\u003c\/th\u003e\n        \u003ctd\u003ePSA adhesive-backed\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth\u003eGrit\u003c\/th\u003e\n        \u003ctd\u003eP320\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth\u003eGrit Type\u003c\/th\u003e\n        \u003ctd\u003eExtra fine\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\u003eOpen coat, coated abrasive\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003cth\u003ePack Quantity\u003c\/th\u003e\n        \u003ctd\u003e100 discs\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\/vacuum-compatibility.svg\" alt=\"vacuum-compatibility\" class=\"icon-sm\"\u003e\n        \u003cdiv\u003e\n          \u003cstrong\u003ePad Interface\u003c\/strong\u003e\n          \u003cdiv class=\"compat-detail\"\u003eFits 5 in. PSA sanding setups using a matching 5-hole perforated pad.\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\/sander.svg\" alt=\"sander\" class=\"icon-sm\"\u003e\n        \u003cdiv\u003e\n          \u003cstrong\u003eReferenced Sanders\u003c\/strong\u003e\n          \u003cdiv class=\"compat-detail\"\u003eCompatible with Porter Cable 334 and 7335 when equipped with a perforated pad, according to the source data.\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-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=\"icon-lg\"\u003e\n      \u003cp class=\"tip-text\"\u003eIf you are switching to these from hook-and-loop discs, double-check that your backup pad is PSA before ordering. The adhesive backing gives a secure hold, but only on the right pad.\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 23-321-320 5 in. 5-Hole P320 PSA Sanding Discs make sense for guys who already know exactly what grit they need\u003c\/h3\u003e\n    \u003cp\u003eThis is a smart buy for finish sanding when you want a known abrasive, a dust-ready hole pattern, and enough discs in the box to stop thinking about consumables for a while.\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWho it's for:\u003c\/strong\u003e Shops and serious DIY users running a 5-inch PSA sander for fine finish work.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWhy it stands out:\u003c\/strong\u003e P320 grit, aluminum oxide abrasive, and a 100-count box from a brand that actually knows abrasives.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWorth knowing:\u003c\/strong\u003e This is not a universal fit disc. You need a PSA setup and a matching 5-hole pad to get the full benefit.\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 do these discs fit?\u003c\/strong\u003e They are made for a 5-inch PSA sanding setup with a 5-hole perforated pad.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWhat grit are these discs?\u003c\/strong\u003e These discs are P320, which is an extra-fine grit intended for fine sanding and finish prep.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWhat abrasive material is used?\u003c\/strong\u003e The abrasive is aluminum oxide.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAre specific sander models referenced for compatibility?\u003c\/strong\u003e Yes. The source data lists Porter Cable 334 and 7335 with a perforated pad.\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":53385942204710,"sku":"23-321-320-MIRKA","price":38.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/20260624341_1.jpg?v=1782171974","url":"https:\/\/www.toolnut.com\/products\/mirka-5-in-320-grit-psa-sanding-discs-5-hole-dust-free-100-pack-23-321-320","provider":"Tool Nut","version":"1.0","type":"link"}