What Is The Arbor of a Saw Blade? York Saw and Knife
3″ blade size = 1/4″ arbor. 6″ blade size = 1/2″ arbor. 7 1/4″ to 10″ blade sizes = 5/8″ arbor. 12″ to 16″ blade sizes = 1″ arbor. Always keep an eye on saw blades that follow the metric system, as you'll see variations from Europe and Asia. They do have millimeter variations that translate to American arbors, however.