{"product_id":"forney-71897-type-27-c24s-bf-masonry-cut-1-4x22-x-4-1-2x22-grinding-wheel-7-8x22-arbor","title":"Masonry Cut Grinding Wheel 4-1\/2 x 7\/8 Arbor Q544074","description":"The Forney 71897 4-1\/2-Inch Type 27 Masonry Grinding Wheel is silicon carbide and dual fiberglass reinforced. Used primarily on ceramic, masonry, plastic and other non-ferrous materials. Quality made to provide fast, safe and dependable service. Designed to be used on right angle grinders. 4-1\/2-Inch (114.3 mm) by 1\/4-Inch (6.35 mm) with 7\/8-Inch (22.23 mm) arbor. C24S-BF with Max 13,300 RPM. Typical Spec Example A24R-BF: A=Used for Steel, 24=Grit (Coarse), R=Medium to Hard Bond. The First series of letters indicates Grain Type; A=Aluminum Oxide (Used in Metal Applications) C=Silicon Carbide (Used for Masonry Applications) ZA= Alumina Zirconium used for (Stainless Steel and Ferrous Metal Applications) TA=Ceramic Treated Aluminum Oxide (Used for Metal Applications) The Second series of letters indicates Grain Size or Grit; 8-24=Coarse, 30-60=Medium, 70-180=Fine and 220-Up=Hard. The Third series of letters indicates Bond Hardness; A-N=Soft, O-S=Medium and T-Z=Hard. The Fourth series of letters indicates type of Bond; BF=Retinoid Fiberglass Reinforced (Double Bonded), E=Shellac, R=Rubber and V=Vitrified. Wheel Types; Type 1=Flat Wheel for Cutting, Type 27=Depressed Center Wheel, Type 28=Hat Shaped for Grinding and Type 29=Flap Disc for Grinding and Finishing. Note: Harder Wheel have a longer life where a softer wheel will cut faster. Fine Grain=Long Life=Slower Cutting and Grinding. Coarse Grain=Short Life=Fast Cutting or Grinding. Proof of purchase required.","brand":"My Store","offers":[{"title":"Default Title","offer_id":45410615558326,"sku":"P353528461773642383","price":18.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/2084\/8822\/files\/13bac7672f4ed2753d15d94c775cdd1072681f5c694cf894a881906e05067ba1.jpg?v=1788765443","url":"https:\/\/arovera.shop\/products\/forney-71897-type-27-c24s-bf-masonry-cut-1-4x22-x-4-1-2x22-grinding-wheel-7-8x22-arbor","provider":"My Store","version":"1.0","type":"link"}