Base Diameter (Inch) Base Diameter (MM)

Inch Thread

(1"L, 1-1/2"L)

Metric Thread

(25MML, 38MML)

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, 1-1/2"L)

Metric Thread

(25MML, 38MML)

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, 1-1/2"L)

Metric Thread

(25MML, 38MML)

1-11/16" 42.9MM 1/4" M6
1-11/16" 42.9MM 5/16" M8
1-11/16" 42.9MM 3/8" M10