Riveted joints terminology:\nIn plate riveting, the distance from the centre of a rivet hole to the nearest free edge of the plate is called what?

Introduction / Context:
Correct terminology in riveted joints is vital for design, drafting, and inspection. Dimensions such as pitch, back pitch, diagonal pitch, and margin (edge distance) control joint strength and prevent tearing at edges.

Given Data / Assumptions:

• Single- or multi-row riveted lap or butt joints.
• Terminology per standard mechanical design and boiler codes.

Concept / Approach:
The edge distance—often called the margin—is measured from the centre of the rivet hole to the nearest free edge of the plate. It is typically selected as a multiple of the rivet diameter to avoid edge tearing and to ensure adequate bearing area around the hole.

Step-by-Step Solution:

Verification / Alternative check:
Design handbooks specify minimum margin, commonly about 1.5 d to 2 d (d = rivet diameter), confirming industry usage of the term and its purpose in preventing edge failures.

Why Other Options Are Wrong:

• Pitch is centre-to-centre distance of rivets along a row.
• Back pitch is the perpendicular distance between adjacent rows.
• Diagonal pitch is the centre-to-centre distance of rivets in adjacent rows measured diagonally.

Common Pitfalls:
Confusing margin with pitch; taking margin from hole edge instead of hole centre; ignoring minimum margin requirements leading to plate edge tearing.

Final Answer:
margin