What should not be used on a swivel hoist ring?

The correct answer is that washers should not be used on a swivel hoist ring. The primary function of a swivel hoist ring is to provide a dynamic lifting capability while maintaining the ability to rotate during use. The design of these hoist rings is specifically engineered to ensure proper load distribution and to allow for smooth operation under tension.

Using washers may introduce unintended consequences, such as uneven loading or a failure to securely attach the hoist ring within its intended design parameters. Washers can create a gap that may affect the integrity of the connection, potentially leading to slippage or damage when the hoist ring is under load.

In contrast, nuts, spacers, and bolts are typically essential components for securely fastening the hoist ring to the intended lifting apparatus. These elements are designed to work in conjunction with the hoist ring to ensure safety and functionality during lifting operations. Proper assembly with the correct hardware is crucial in maintaining the strengths and operational limits that are essential for safe lifting practices.