Section R. 408.10141 - General requirementsRule 141.
(1) An abrasive wheel shall be mounted between flanges, except as noted below, which shall not be less than 1/3 the diameter of the abrasive wheel. Exceptions: (b) Portable cup, plug and cone wheels with threaded inserts or studs.(c) Abrasive disc of the inserted nut, inserted washer and projecting stud type.(e) Cylinder, cup or segmented wheel mounted in a chuck.(f) Depressed center wheel.(g) Internal wheel less than 2 inches in diameter.(h) Straight and flaring cup wheel for terrazzo use.(i) Cutting-off wheel (see subrule (2)).(j) Masonry and concrete saws.(2) A straight cutting-off wheel shall be mounted between relieved flanges which are not less than 1/4 the wheel diameter. A depressed center cutting-off wheel more than 16 inches in diameter shall be mounted between flat unrelieved flanges not less than 1/4 the wheel diameter.(3) A masonry saw using a reinforced resinoid and steel-centered wheel may use 4-inch diameter flanges for wheels through 20-inch diameter.(4) Concrete saws using a steel-centered wheel 20-inch and larger may use flanges 1/6 the wheel diameter.Mich. Admin. Code R. 408.10141