Maximum gauge (transverse spacing between rivet rows) for long riveted joints For long riveted joints, the greatest permissible gauge (distance between adjacent rows at right angles to the load) should not exceed (d = hole diameter):

Introduction / Context:
“Gauge” in riveted joints is the transverse spacing between adjacent rows of rivets. Limiting the maximum gauge controls tearing and ensures an efficient transfer of force across rows without excessive eccentricity.

Given Data / Assumptions:

• Long joint in tension or shear.
• d denotes the rivet hole diameter (governing dimension for detailing rules).
• Objective: choose the commonly adopted upper bound on gauge expressed as a multiple of d.

Concept / Approach:
Traditional riveted-joint proportioning imposes maxima on pitches and gauges. A typical rule-of-thumb places the greatest gauge for long joints near 8 d to prevent chain tearing and maintain good force flow between rows.

Step-by-Step Solution:
Identify that too-large gauge weakens plate between rows.Apply customary detailing limit → gauge ≤ about 8 d.Select 8 d from the options.

Verification / Alternative check:
Design handbooks list compatible limits on edge distance, pitch, and gauge; 8 d sits consistently with those proportions.

Why Other Options Are Wrong:

• 6 d: conservative but not the common upper bound for long joints.
• 10 d: may be excessive, risking tearing between rows.
• 4 d and 2 d: unrealistically small for practical fabrication.

Common Pitfalls:
Confusing “gauge” (between rows) with “pitch” (along the row). The limits are different.

Final Answer:
8 d