Dowel pins are short cylindrical rods that are made up of either metal, plastic, or wood and are used to align or join two or more components in machinery, construction, and furniture making. They have many uses, such as aligning machine components during assembly for consistent results, joining stone and concrete in masonry, and providing precision holes for mating fasteners. MacDonald provides dowel pins in common materials like steel and stainless steel and we also offer a wide selection of sizes, including the prevailing standard for imperial (ASME B18.8.2) and metric (DIN) sizes.