Pitch Of Rivets

The least distance from center to center of rivets, or the pitch, should not be less than 3 times the diameter of the rivet. If the members are in tension, the greatest pitch should not be more than 30 times the thickness of the thinnest outside plate or member. If the members are in compression, the pitch should not be more than 16 times the thickness of the thinnest outside plate or member. The pitch should never be greater than 6 in., except where the rivets are set zigzag, or staggered, in which case the pitch should not be more than 6 in. in a staggered line. The distance from the end of a plate to the center of a rivet should not be less than the thickness of the plate plus the diameter of the rivet plus 1/2 in. The distance from the center of a rivet to the side of the plate should not be less than one-half the thickness of the plate plus one-half the diameter of the rivet plus 1/8 in.

The sizes of rivets most commonly used in building construction are 3/4 in. and 7/8 in. diameter; 5/8 in. are sometimes used in connections where there is but little strain. For economy, there should be, in any structure, as few different sizes of rivets as possible.