{"Images":["https://res.cloudinary.com/osg-usa-inc/image/upload/f_jpg,q_auto//Products%2FMilling%2FSolid%2FBall%20Nose%2FList%20521/End_Mills_-_End_Mill_-_Single_End_Mills_-_List_521_-_Ball_End_-_Catalog"],"Number of Flutes":"2","Corner Radius - Inch (R)":["0.0625","0.09375","0.125","0.15625","0.1875","0.25","0.28125","0.3125","0.375","0.4375","0.5","0.5625","0.625","0.75","0.21875"],"Diameter - Inch (D)":["0.125","0.1875","0.25","0.3125","0.375","0.5","0.5625","0.625","0.75","0.875","1","1.125","1.25","1.5","0.4375"],"Cutting Diameter Tolerance - Inch":"+0.0011 / -0","Diameter - Fractional Size (D)":["1/8","3/16","1/4","5/16","3/8","1/2","9/16","5/8","3/4","7/8","1","1-1/8","1-1/4","1-1/2","7/16"],"Product Overview":"2 Flute, HSS-Co, Regular Length, Ball End, Two Flute","Length of Cut - Inch (Lc)":["0.375","0.5","0.625","0.75","1.5","1","1.125","1.3125","1.375","1.625","1.875","2.25","2","3","2.5"],"Overall Length - Inch (L)":["2.3125","2.375","2.4375","2.5","3.25","3","3.125","3.3125","3.5","3.875","4.125","4.5","4.25","5.25","4.75","5","4"],"Helix Angle - Degree":"30","Shank Diameter - Inch (d)":["0.375","0.5","0.625","0.75","0.875","1","1.25"],"Web Literature 4":"800388CA","Stainless Steels : 300":"M; Good","Substrate":"HSS-CO","Web Literature 1":"8002024CA-EM,321|8002024CA-EMT,170","End Cut Type":"Ball Nose","Notes":"Other coatings available upon request.","Surface Treatment":"BRIGHT","Units":"Inch","Hardened Steels : 35 HRC":"H; Good","Hardened Steels : 35-45 HRC":"H; Good","Cutting Type":"Center Cutting","Cast Iron":"K; Good","Low Carbon Steel : 1010; 1018":"P; Best","List Name":"COBALT HSS EBD","Medium Carbon Steel : 1035; 1045":"P; Best","Alloy Steels : 4140; 4340":"P; Good","Full Description":"High Performance Cobalt HSS End Mills for General Milling Applications","Short Description":"High Performance Cobalt HSS End Mills for General Milling Applications","Die Steels":"P; Good","Stainless Steels : 17-4PH":"M; Good","High Carbon Steel : 1065":"P; Good","View Catalog Page":"Here","View Speed and Feed Page":"Here","Stainless Steels : 400":"M; Good","Aluminum : Casting":"N; Good","Coolant Thru":"No","Aluminum : 6061; 7075":"N; Good","Weldon Flat":"Yes","Mill Type":"Single End","Length of Cut - Specification":["REGULAR","LONG","STUB"],"Cutting Direction":"RH","Helix Direction":"RH","Titanium : 6AL4V (30HRC)":"S; Good","Diameter-Sizes":"1/8\" - 1.5\"","Flute-Sizes":"-","Neck-Sizes":"-","Taper-Sizes":"-","Overall-Sizes":"2.3125\" - 5.25\"","Shank-Sizes":"0.375\" - 1.25\"","Friendly Name":"521","CategoryBrand":"OSG"}