The width of the thimble required for clamped rope attachments shall be at least how many times the rope diameter?

• A. 8 times the rope diameter
• B. 12 times the rope diameter
• C. 6 times the rope diameter
• D. 4 times the rope diameter

Answer: (A)

The key idea is giving the rope termination a solid bearing surface and a gentle bend. When the thimble’s width is at least eight times the rope diameter, the rope can sit properly in the thimble groove and form a smooth bend, which reduces wear on the rope strands and prevents pinching at the clamp and edges. This extra room also ensures the clamps can grip securely without the rope riding up or deforming against a narrow edge. If the thimble is narrower, the rope is more prone to kinking, accelerated wear, and improper clamp seating, increasing the risk of slippage or rope failure under load. So a minimum of eight times the rope diameter provides a safer, longer-lasting termination.