Riveted joints – basic terminology and correct statements\nWhich of the following statements is correct?

Introduction / Context:
Clear terminology in riveted joints prevents design and fabrication errors. Common terms include pitch, margin (edge distance), and the basis for specifying a rivet.

Given Data / Assumptions:

• Standard fabrication practice for structural and machine riveted joints.
• Nominal sizes refer to shank/nominal diameter unless stated otherwise.

Concept / Approach:
Rivets are ordered and identified by nominal (shank) diameter and length under the head. Hole sizes are slightly larger than rivet diameter to permit insertion. Pitch is the centre-to-centre distance along the load direction, while margin is the distance from a hole centre to the plate edge.

Step-by-Step Reasoning:
Identify the correct definition: specification by shank diameter is standard.Check others: hole size in plates is typically larger than rivet to allow driving; margin is not pitch; recommended pitch is generally much greater than 1.5 d (which is a typical minimum margin, not pitch).

Verification / Alternative check:
Design handbooks list pitches typically ≥ 2.5 d to 3 d or more depending on application, and margin commonly ≥ 1.5 d.

Why Other Options Are Wrong:
(a) Hole size is slightly greater, not less; (b) margin is edge distance, while pitch is centre-to-centre; (d) 1.5 d refers to minimum edge distance, not pitch; (e) head diameter is not the standard specification.

Common Pitfalls:
Interchanging terms pitch and margin; ordering rivets by the wrong size metric.

Final Answer:
Rivets are generally specified by their shank diameter