Riveted joint terminology: definition of pitch between rows\n\n“The perpendicular distance between the centre lines of successive rows is called pitch.” Evaluate this statement for standard riveted joint terminology.

Introduction / Context:
Clear terminology in riveted joints avoids fabrication and inspection errors. Two commonly confused terms are pitch and back pitch (or transverse pitch).

Given Data / Assumptions:

• Pitched rows of rivets forming either chain or zig-zag patterns.
• Center-to-center distances define spacing parameters.

Concept / Approach:
Standard definitions: pitch (p) is the center-to-center distance between adjacent rivets in the same row, measured along the joint line. The perpendicular distance between adjacent rows is called back pitch or transverse pitch, not pitch.

Step-by-Step Solution:
Along-row spacing → pitch p.Perpendicular spacing between rows → back pitch (p_b) or transverse pitch.Therefore, the given statement mislabels back pitch as pitch and is incorrect.

Verification / Alternative check:
Consult typical joint layout diagrams: dimensions are marked as p (longitudinal pitch), p_b (back pitch), and sometimes diagonal pitch p_d for zig-zag arrangements.

Why Other Options Are Wrong:
“Agree” is incorrect by definition. Limiting correctness to zig-zag or chain joints still misuses the term. “Diamond” refers to group geometry, not spacing terminology.

Common Pitfalls:
Using “pitch” generically for any spacing; forgetting to distinguish back pitch from diagonal pitch in staggered rows.

Final Answer:
Disagree