What is the ability of a fastener material to be drawn or stretched without breaking?

Ductility refers to the ability of a material, particularly metals, to undergo significant plastic deformation before rupture. This characteristic allows a fastener to be stretched or drawn into a wire-like form while still maintaining its structural integrity, which is essential for various applications where fasteners need flexibility and elongation under load without breaking.

In contrast, tensile strength measures how much force a material can withstand when being pulled apart. Although high tensile strength is often desirable in fasteners, it does not directly relate to their ability to be drawn or stretched.

Elasticity is the capacity of a material to return to its original shape after being deformed, which does not necessarily involve any stretching beyond the elastic limit.

Brittleness describes a material's tendency to fracture without significant plastic deformation when subjected to stress, meaning it would not be suitable for applications that require stretching or drawing.

In summary, ductility specifically encompasses the capacity for materials to be drawn or stretched without breaking, making it the correct answer for this question.