Piston and Bore Dimensions

Standard Sizes
Tolerance Group 0
Piston Size 103.98 ± 0.007 mm (4.0937 in ± 0.0003 in)
Bore Size 104 ± 0.005 mm (4.0945 ± 0.0002 in)
Tolerance Group 1
Piston Size 103.99 ± 0.007 mm (4.0941 ± 0.0003 in)
Bore Size 104.01 ± 0.005 mm (4.0949 ± 0.0002 in)
Tolerance Group 2
Piston Size 104 ± 0.007 mm (4.0945 ± 0.0003 in)
Bore Size 104.02 ± 0.005 mm (4.0953 ± 0.0002 in)

1st Oversize
Tolerance Group 10
Piston Size 104.48 ± 0.007 mm (4.1134 ± 0.0003 in)
Bore Size 104.50 ± 0.005 mm (4.1142 ± 0.0002 in)
Tolerance Group 11
Piston Size 104.49 ± 0.007 mm (4.1138 ± 0.0003 in)
Bore Size 104.51 ± 0.005 mm (4.1146 ± 0.0002 in)
Tolerance Group 12
Piston Size 104.50 ± 0.007 mm (4.1142 ± 0.0003 in)
Bore Size 104.52 ± 0.005 mm (4.1150 ± 0.0002 in)