{"title":"Wood Grinding Discs for Angle Grinders","description":"\u003cp\u003eThese flap discs work as wood grinding discs and wood sanding discs for an angle grinder, for woodworkers, carvers and builders who need to remove material fast and then smooth it. Every disc here is listed for both wood and metal.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e4-1\/2\" x 7\/8\" zirconia alumina Type 29 flap discs, 20 per pack, in 60 or 80 grit, on a fiberglass backing\u003c\/li\u003e\n\u003cli\u003e7\" x 7\/8\" zirconia and ceramic blend Type 27 flap discs, 5 per pack, in 40, 60 or 80 grit\u003c\/li\u003e\n\u003cli\u003e7\" x 7\/8\" calcined aluminum oxide Type 27 flap discs, 10 per pack, in 40 grit, on a fiberglass backing\u003c\/li\u003e\n\u003cli\u003eUses listed across the range: grinding, blending, deburring and finishing, with rust and paint removal on the 60 grit zirconia disc\u003c\/li\u003e\n\u003cli\u003eAll discs have a 7\/8\" (22 mm) arbor. Maximum speed is 13,300 RPM on the 4-1\/2\" discs and 8,500 RPM on the 7\" discs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003ch3\u003eIs a 40 grit flap disc good for wood?\u003c\/h3\u003e\u003cp\u003eYes, 40 grit is the coarse choice for fast stock removal on wood. Follow it with 60 grit to clean up the deep scratches, then 80 grit before finer sanding. Both 7\" disc lines come in 40 grit, and the 4-1\/2\" discs come in 60 and 80.\u003c\/p\u003e\u003ch3\u003eCan I use a wood sanding disc on an angle grinder?\u003c\/h3\u003e\u003cp\u003eYes. Flap discs are made to run on an angle grinder, and every disc in this collection fits a 7\/8\" arbor. Keep the disc moving with light pressure, because wood scorches quickly if the disc sits in one spot. Never exceed the maximum RPM marked on the disc.\u003c\/p\u003e\u003ch3\u003eType 27 or Type 29: which wood grinding disc should I choose?\u003c\/h3\u003e\u003cp\u003eChoose Type 29 for edges and contours and Type 27 for broad, flat surfaces. Here the 4-1\/2\" discs are Type 29 and the 7\" discs are Type 27. A Type 29 disc has a conical face and works at a steeper angle, while a Type 27 disc is flat and sits nearly level on the work.\u003c\/p\u003e\u003ch3\u003eDo wood grinding discs also work on metal?\u003c\/h3\u003e\u003cp\u003eThese do. Every disc in this collection is listed for metal as well as wood, and two of them also list stainless steel. Keep separate discs for each job, though, so resin, paint and wood residue does not end up on metal parts you plan to weld or finish.\u003c\/p\u003e\u003cp\u003eBrowse every size and grain in our \u003ca href=\"\/collections\/flap-disc\"\u003eflap discs\u003c\/a\u003e collection, and see our guides to \u003ca href=\"\/blogs\/news\/type-27-vs-type-29-flap-disc\"\u003eType 27 vs Type 29 flap discs\u003c\/a\u003e and \u003ca href=\"\/blogs\/news\/woodworking-sanding-grit-progression\"\u003ewoodworking grit progression\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"wa-10pack-7-x-7-8-inch-grit40-calcined-aluminum-oxide-flap-disc-sanding-disc-grinding-wheel-for-angle-grinder-metal-grinding-for-wood-metal-stainless-steel-t27-7-inch-40","title":"7\" x 7\/8\" Calcined Aluminum Oxide T27 Flap Discs for Metal \u0026 Wood","description":"\u003cul\u003e\n\u003cli\u003eDURABLE - Fiberglass backers provide a balanced, smooth grind.\u003c\/li\u003e\n\u003cli\u003eSIZE - 7\" Diameter, 7\/8\" Arbor (180mmx22mm), Type 27, 40 grit, calcined aluminum oxide.\u003c\/li\u003e\n\u003cli\u003ePACKAGE - 10 Pack of jumbo aluminum oxide, fiberglass backed flap discs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is a flap disc used for?\u003c\/strong\u003e\u003cbr\u003eA: It grinds and finishes in one step — weld blending, deburring, rust and paint removal, and surface finishing on metal and wood.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Type 27 and Type 29 flap discs?\u003c\/strong\u003e\u003cbr\u003eA: Type 27 is flat for surface and edge work on flat areas; Type 29 is conical for more aggressive stock removal and better contact on edges and contours.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What grinder do these fit?\u003c\/strong\u003e\u003cbr\u003eA: Standard angle grinders matching the arbor size listed in the title and specifications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Which grit should I choose?\u003c\/strong\u003e\u003cbr\u003eA: Use a coarse grit (36–40) for heavy stock removal, medium (60–80) for general grinding, and fine (120+) for blending and finishing.\u003c\/p\u003e\u003ch2\u003eWhy choose Whitby Abrasives\u003c\/h2\u003e\u003cp\u003eWhitby Abrasives Inc. is a Canadian supplier of professional grinding, cutting, sanding, and finishing abrasives. We focus on consistent quality, fair pricing, and fast shipping across Canada so fabricators, welders, woodworkers, contractors, and DIYers get abrasives that perform job after job. Have a question about sizing or the right grit for your project? Our team is happy to help.\u003c\/p\u003e","brand":"Whitby Abrasives","offers":[{"title":"40 Grit \/ 10 PC","offer_id":48181908406493,"sku":null,"price":49.99,"currency_code":"CAD","in_stock":true},{"title":"80 Grit \/ 10 PC","offer_id":48181908439261,"sku":null,"price":49.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/2693\/0141\/files\/8024cfc6.jpg?v=1777666709"},{"product_id":"20pack-4-1-2-x-7-8-inch-80-premium-zirconia-flap-disc-for-angle-grinder-flap-discs-for-metalworking-and-wood-working-sanding-disc-type-29-grit-80","title":"4-1\/2\" x 7\/8\" 80 Grit Zirconia Type 29 Flap Discs for Metal \u0026 Wood","description":"\u003cp class=\"wa-rating-line\"\u003e\u003cstrong\u003eCustomer rating:\u003c\/strong\u003e 4.6 out of 5 from 172 customer ratings on our online marketplace store (November 2026).\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAPPLICATION - Suitable for metal and woodworking, concrete grinding, finishing, and stone smoothing — grinding, deburring, and light grinding.\u003c\/li\u003e\n\u003cli\u003eHIGH QUALITY - Premium zirconia abrasive cloth backed by a high strength fiberglass disc enhances strength, durability, and extends disc life. Holds up to high temperatures and pressure.\u003c\/li\u003e\n\u003cli\u003eDESIGN - Bevel Type 29 is effective for radius\/contour grinding, edge grinding, and weld blending.\u003c\/li\u003e\n\u003cli\u003ePERFORMANCE - Maximum 13,300 RPM. Use eye protection and all safety guards per ANSI B7.1.\u003c\/li\u003e\n\u003cli\u003eSIZE - 4 1\/2\" x 7\/8\" (115mmx22mm) Grit 80.\u003c\/li\u003e\n\u003cli\u003ePACKAGE - 20 pcs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is a flap disc used for?\u003c\/strong\u003e\u003cbr\u003eA: It grinds and finishes in one step — weld blending, deburring, rust and paint removal, and surface finishing on metal and wood.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Type 27 and Type 29 flap discs?\u003c\/strong\u003e\u003cbr\u003eA: Type 27 is flat for surface and edge work on flat areas; Type 29 is conical for more aggressive stock removal and better contact on edges and contours.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What grinder do these fit?\u003c\/strong\u003e\u003cbr\u003eA: Standard 4-1\/2\" angle grinders with a 7\/8\" arbor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Which grit should I choose?\u003c\/strong\u003e\u003cbr\u003eA: Use a coarse grit (36–40) for heavy stock removal, medium (60–80) for general grinding, and fine (120+) for blending and finishing.\u003c\/p\u003e\u003ch2\u003eWhy choose Whitby Abrasives\u003c\/h2\u003e\u003cp\u003eWhitby Abrasives Inc. is a Canadian supplier of professional grinding, cutting, sanding, and finishing abrasives. We focus on consistent quality, fair pricing, and fast shipping across Canada so fabricators, welders, woodworkers, contractors, and DIYers get abrasives that perform job after job. Have a question about sizing or the right grit for your project? Our team is happy to help.\u003c\/p\u003e","brand":"Whitby Abrasives","offers":[{"title":"20 PC","offer_id":47870711365853,"sku":"RC-YFQE-XUHP","price":21.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/2693\/0141\/files\/aebeec9f.jpg?v=1777666720"},{"product_id":"20pack-4-1-2-x-7-8-inch-professional-grade-60-premium-zirconia-flap-disc-for-angle-grinder-flap-discs-for-metalworking-and-wood-working-sanding-disc-type-29-grit-60","title":"4-1\/2\" x 7\/8\" 60 Grit Zirconia Type 29 Flap Discs for Metal \u0026 Wood","description":"\u003cp class=\"wa-rating-line\"\u003e\u003cstrong\u003eCustomer rating:\u003c\/strong\u003e 4.6 out of 5 from 172 customer ratings on our online marketplace store (November 2026).\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eAPPLICATION - Suitable for processing and polishing of stainless steel and alloy steel. Coarse zirconia alumina tailored for aggressive grinding on robust materials such as metal.\u003c\/li\u003e\n\u003cli\u003eHIGH QUALITY - Premium zirconia abrasive cloth backed by a high strength fiberglass disc enhances strength, durability, and extends disc life. Holds up to high temperatures and pressure.\u003c\/li\u003e\n\u003cli\u003eSIZE - 4 1\/2\" x 7\/8\" (115mmx22mm) Grit 60.\u003c\/li\u003e\n\u003cli\u003ePACKAGE - 20 pcs.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is a flap disc used for?\u003c\/strong\u003e\u003cbr\u003eA: It grinds and finishes in one step — weld blending, deburring, rust and paint removal, and surface finishing on metal and wood.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Type 27 and Type 29 flap discs?\u003c\/strong\u003e\u003cbr\u003eA: Type 27 is flat for surface and edge work on flat areas; Type 29 is conical for more aggressive stock removal and better contact on edges and contours.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What grinder do these fit?\u003c\/strong\u003e\u003cbr\u003eA: Standard 4-1\/2\" angle grinders with a 7\/8\" arbor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Which grit should I choose?\u003c\/strong\u003e\u003cbr\u003eA: Use a coarse grit (36–40) for heavy stock removal, medium (60–80) for general grinding, and fine (120+) for blending and finishing.\u003c\/p\u003e\u003ch2\u003eWhy choose Whitby Abrasives\u003c\/h2\u003e\u003cp\u003eWhitby Abrasives Inc. is a Canadian supplier of professional grinding, cutting, sanding, and finishing abrasives. We focus on consistent quality, fair pricing, and fast shipping across Canada so fabricators, welders, woodworkers, contractors, and DIYers get abrasives that perform job after job. Have a question about sizing or the right grit for your project? Our team is happy to help.\u003c\/p\u003e","brand":"Whitby Abrasives","offers":[{"title":"20 PC","offer_id":47870712348893,"sku":null,"price":29.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/2693\/0141\/files\/3e095676.jpg?v=1777666720"},{"product_id":"5pack-7-x-7-8-zirconia-ceramic-purple-flap-disc-sanding-disc-grinding-wheel-for-angle-grinder-metal-grinding-woodworking-t27-7-inch","title":"7\" x 7\/8\" Zirconia\/Ceramic Type 27 Flap Discs for Metal \u0026 Wood","description":"\u003cul\u003e\n\u003cli\u003eHIGH QUALITY - Premium zirconia and ceramic blend grain offers a quick antistatic sanding experience and is durable and long lasting.\u003c\/li\u003e\n\u003cli\u003eMULTIPURPOSE - Ideal for use on carbon steel, stainless steel, and other heat-sensitive alloys.\u003c\/li\u003e\n\u003cli\u003eSIZE - 7\" Diameter, 7\/8\" Arbor, Type 27. Available in 40, 60, and 80 grit.\u003c\/li\u003e\n\u003cli\u003ePACKAGE - 5 PACK\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: What is a flap disc used for?\u003c\/strong\u003e\u003cbr\u003eA: It grinds and finishes in one step — weld blending, deburring, rust and paint removal, and surface finishing on metal and wood.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between Type 27 and Type 29 flap discs?\u003c\/strong\u003e\u003cbr\u003eA: Type 27 is flat for surface and edge work on flat areas; Type 29 is conical for more aggressive stock removal and better contact on edges and contours.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What grinder do these fit?\u003c\/strong\u003e\u003cbr\u003eA: 7\" angle grinders with a 7\/8\" arbor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Which grit should I choose?\u003c\/strong\u003e\u003cbr\u003eA: Use a coarse grit (40) for heavy stock removal, medium (60–80) for general grinding, and fine (120+) for finishing.\u003c\/p\u003e\u003ch2\u003eWhy choose Whitby Abrasives\u003c\/h2\u003e\u003cp\u003eWhitby Abrasives Inc. is a Canadian supplier of professional grinding, cutting, sanding, and finishing abrasives. We focus on consistent quality, fair pricing, and fast shipping across Canada so fabricators, welders, woodworkers, contractors, and DIYers get abrasives that perform job after job. Have a question about sizing or the right grit for your project? Our team is happy to help.\u003c\/p\u003e","brand":"Whitby Abrasives","offers":[{"title":"60 Grit \/ 5 PC","offer_id":47964400091357,"sku":"F7-5","price":31.99,"currency_code":"CAD","in_stock":true},{"title":"80 Grit \/ 5 PC","offer_id":47964400124125,"sku":"F7-6","price":31.99,"currency_code":"CAD","in_stock":true},{"title":"40 Grit \/ 5 PC","offer_id":47964400156893,"sku":"FZC00077840","price":31.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0821\/2693\/0141\/files\/d51b183f.jpg?v=1777666805"}],"url":"https:\/\/whitbyabrasives.ca\/collections\/flap-discs-for-wood.oembed","provider":"Whitby Abrasives Inc.","version":"1.0","type":"link"}