ASVAB Practice Test

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Which of the following uses a penny system to specify its size?

bolt
finishing nail
machine screw
wood screw

The correct answer is: finishing nail

The finishing nail is the correct answer because it is commonly specified using a penny system, which is a traditional method for denoting the length and size of various types of nails. In this system, the term "penny" (abbreviated as "d") comes from the old practice of pricing nails by the penny for a certain quantity. The size of finishing nails is indicated by the penny size followed by a number, which reflects their length. For example, a 6d finishing nail is typically 2 inches long. Other options do not use the penny system in the same way; for instance, bolts are often categorized by diameter and thread pitch rather than penny size. Machine screws are specified by their major diameter and thread count. Likewise, wood screws use different gauges and measurements that do not correlate as directly with the penny system used for finishing nails.