ASA Sheet Metal and Non-Metallic Structures Practice Test

To determine the dimensions of an MS20430AD-4-8 rivet, it's important to break down the rivet's designation according to the conventions established in the military specifications. The designation "MS20430AD-4-8" provides specific information about its size and type.

The first part of the designation, "MS20430," identifies the rivet series and type. The next segment, "AD," indicates the material and the style of the rivet. Following this, the "4" refers to the diameter of the rivet in 1/32 inch units, which translates to 1/8 inch (4/32 inch). Lastly, the "8" denotes the length of the rivet, which in this case corresponds to 1/2 inch (as the length is also interpreted in 1/16 inch increments, with 8 being 1/2).

Hence, the correct diameter of the MS20430AD-4-8 rivet is 1/8 inch, and its length is 1/2 inch, confirming that answer B is accurate. Understanding this nomenclature is crucial for professionals working with fasteners in aerospace applications.