Wire rope diameter should be measured at how many places with calipers?

• A. Six or more places
• B. Four places
• C. Eight places
• D. Ten places

Answer: (A)

Wire rope isn’t perfectly uniform along its length or around its circumference, so a single measurement can miss local variations that affect fit and load handling. Taking caliper readings at six or more places around the rope’s cross-section provides a representative sample that captures these irregularities and yields a reliable diameter for safe use.

Measuring at only four places could miss smaller or larger spots, leading to an inaccurate diameter. While eight or ten places might be used in stricter checks, the standard practical guidance is six or more, balancing accuracy with effort. This approach helps ensure the rope will fit properly with drums, sheaves, and other hardware and maintain safe operating clearances.