HEX CAP SCREW
Description: This is essentially a machine bolt with a hexagonal head.
Buying information: These are often used in prethreaded metal items, but can be used with nuts like machine bolts. The screws come in various sizes: the diameter is described first, followed by the number of threads per inch. In a 1/4x20 cap screw, for example, the fastener is 1/4 inch in diameter and has 20 threads per inch. Cap screws come in various "codes"; dash markings on head indicate strength rating -- the more marks, the stronger the bolt.
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