Base Diameter (inch) Base Diameter (mm) Inch Thread (1"L) Metric Thread (1"L)
1-1/8" 28.6mm 1/4" M6
1-1/8" 28.6mm 5/16" M8
1-1/8" 28.6mm 3/8" M10
Base Diameter (inch) Base Diameter (mm) Inch Thread (1"L) Metric Thread (1"L)
1-3/8" 34.9mm 1/4" M6
1-3/8" 34.9mm 5/16" M8
1-3/8" 34.9mm 3/8" M10
Base Diameter (inch) Base Diameter (mm) Inch Thread (1"L) Metric Thread (1"L)
1-11/16" 42.9mm 1/4" M6
1-11/16" 42.9mm 5/16" M8
1-11/16" 42.9mm 3/8" M10