1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 19Get this manual
GENERAL INFORMATION
American fasteners are normally described by diameter, threads per inch and lengthFor example, 38-16 indicates bolt 38 inch in diameter with 16 threads per inch, inches longThe measurement across two flats on the head of the bolt or screw indicates the proper wrench size to
be usedFigure 13 shows how to determine bolt diameterNOTE bolt from dealer or parts store, you must know how to specify bolt lengthCorrectly measure bolt length by measuring the length starting from underneath the bolt head to the end of the bolt (Figure 17)