What should be placed between the metal cap of the jack and the load when there is danger of slippage?

What should be placed between the metal cap of the jack and the load when there is danger of slippage?

• A. A wood block
• B. A rubber mat
• C. A steel plate
• D. A wedge

Answer: (A)

Preventing load slippage when using a jack relies on cribbing between the cap and the load. A wood block provides a flat, rough surface that increases friction and distributes the load over a larger area, reducing the chance that the cap will shift or dig into the load. This simple, solid contact helps keep both the jack and the load stable, especially when there’s any tendency for the load to move. Rubber mats can slide or deform under heavy pressure, which may not stop slippage. A steel plate is rigid and can still slip on smooth surfaces and may not protect the load from indentation or point pressure. A wedge doesn’t offer a stable, flat contact surface and can shift under load, making the setup unsafe. Using properly sized wooden cribbing is the standard practice to create a stable base and prevent movement.

Preventing load slippage when using a jack relies on cribbing between the cap and the load. A wood block provides a flat, rough surface that increases friction and distributes the load over a larger area, reducing the chance that the cap will shift or dig into the load. This simple, solid contact helps keep both the jack and the load stable, especially when there’s any tendency for the load to move.

Rubber mats can slide or deform under heavy pressure, which may not stop slippage. A steel plate is rigid and can still slip on smooth surfaces and may not protect the load from indentation or point pressure. A wedge doesn’t offer a stable, flat contact surface and can shift under load, making the setup unsafe. Using properly sized wooden cribbing is the standard practice to create a stable base and prevent movement.