Ultimate Strength

The maximum conventional stress, tensile, compressive, or shear, that a material can withstand.

Ultrasonic Frequency

A frequency, associated with elastic waves, that is greater than the highest audible frequency, generally regarded as being higher than 15 kc per sec.

Universal Mill

A rolling mill in which rolls with a vertical axis roll the edges of the metal stock between some of the passes through the horizontal rolls.

Utility Sheet Aluminum

Mill finish coiled or flat sheet of unspecified composition and properties produced in specific standard sizes and suitable for general building trade usage.

Ultimate Tensile Strength (UTS)

Another common term to describe mechanical strength. This metal property is expressed in thousands of pounds per square inch and denotes how much stress can be gradually applied to the metal before it fractures. Tensile testing is done by pulling two ends of a test sample in opposite directions under a constantly increasing force, subjecting the product to stress. The stress is measured until the product is pulled in two. The measurement at the exact time of fracture is the material’s ultimate tensile strength.