... ''x1/4'', 1 1/4''x1/4'', 1 1/2''x1/4'', 1''x1/8'', 1 1/4''x1 ... /8'', 1 1/2''x1/8'' etc2Bearing Bar Pitch12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 32.5, 34 ... .3, 35, 38.1, 40, 41.25, ... 60, 80mm etcUS standard: 19-w-4, 15-w-4, 11-w-4 ... 76, 80, 100, 101.6, 120mm, 2'' & 4'' etc 4Material GradeASTM A36, A1011, A569, Q235, S275JR, ...