Riveted joints: definition of back pitch in zig-zag riveting Statement: The distance between the centres of rivets in adjacent rows of a zig-zag riveted joint is called back pitch.

Introduction / Context:
In plate-to-plate connections, rivet layout parameters govern strength against tearing, shearing, and bearing failures. Standard terms include pitch (longitudinal spacing), back pitch (transverse spacing between adjacent rows), and diagonal pitch in zig-zag patterns. Knowing these helps compute net section and staggered pitch efficiency.

Given Data / Assumptions:

• Zig-zag riveted joint with multiple rows.
• Centers of rivets are used for spacing definitions.

Concept / Approach:
Back pitch is the perpendicular spacing between adjacent rows of rivets. In zig-zag riveting, holes are staggered; the diagonal pitch relates a hole in one row to the nearest in the adjacent row along the joint direction, while back pitch is the transverse distance between rows irrespective of staggering.

Step-by-Step Solution:
Identify joint direction (longitudinal axis).Measure spacing between row centre lines perpendicular to this axis.This spacing is the back pitch, matching the statement.

Verification / Alternative check:
Design handbooks and codes define p (pitch), pb (back pitch), and pd (diagonal) consistently; diagrams show back pitch as transverse spacing.

Why Other Options Are Wrong:
False contradicts standard definition; qualifiers (chain, lap, butt) are unnecessary because the definition of back pitch does not depend on joint type.

Common Pitfalls:
Confusing diagonal pitch with back pitch; measuring edge distance instead of row-to-row spacing.

Final Answer:
True