In riveted joints, the center-to-center distance between two consecutive rivets in the same row is called the pitch of rivets.

Introduction / Context:
Riveted and bolted joints are laid out using standard geometric terms. Knowing the correct terminology—pitch, margin, back pitch, and diagonal pitch—is essential for strength checks against tearing, shearing, and bearing.

Given Data / Assumptions:

• Plate joint with one or more rows of rivets.
• Uniform rivet spacing within a given row.
• Definitions as used in machine design and fabrication standards.

Concept / Approach:
The pitch is defined as the center-to-center distance between adjacent rivets along the same row. Other distances measure from rivet center to plate edge (margin), or between adjacent rows (back pitch), or along a diagonal between staggered rows (diagonal pitch).

Step-by-Step Solution:

Verification / Alternative check:
Check a standard joint sketch: symbols p (pitch), m (margin), pb (back pitch), pd (diagonal pitch) are conventionally labeled.

Why Other Options Are Wrong:
Margin is center-to-near-edge distance.Back pitch is the perpendicular spacing between rows.Diagonal pitch is the center distance between staggered rows measured along a diagonal.

Common Pitfalls:
Confusing pitch and gauge; using edge distance in place of pitch; measuring across different rows.

Final Answer:

pitch