Design Factor – a measure of the theoretical reserve capacity, which is determined by dividing the ultimate load by the working load limit.

Proof Load – the average force to which a product is subjected before deformation occurs.

Proof Test – a test conducted on a product to determine defective material or manufacturing defects.

Shock Load – a load that results from the rapid application of a force or a rapid movement of a static load.

Static Load – the load resulting from a constant applied force or load.

Ultimate Load – the maximum load or force at which a product fails or no longer supports the load.

Working Load Limit (also known as WLL, Rated Load Value and Resultant) – the maximum mass or force for which the product is authorized to support in general service when the pull is applied with respect to the centerpiece of the product.