UTILITY UTILITY grade is well suited for crating and dunnage applications. UTILITY grade is a utility grade of lumber that grades out below a Number 3 Shop grade. Width:  3-3/8 inch (85.73 mm) minimum Lengths: 72 inch (182.88 cm) minimum. Minimum Finger Joint: 12 inch (30.48 cm) Overall Minimum Yield: below 33-1/3 percent.