The development of square bolts is closely related to the overall development history of bolts, and is also driven by the progress of industrial technology and the improvement of standards and norms. Its specific development history is as follows:
From ancient times to the Middle Ages: The prototype of bolts can be traced back to the Roman era, when people used wooden bolt-shaped objects to latch doors. Around 400 BC, threads came into being and were used for water lifting, grape juice pressing, etc., but at this time, bolts as fasteners had not yet appeared. In medieval Europe, screws began to gradually gain popularity in industry. Early screws were made of wood and were mainly used in wine presses, olive oil presses, etc.
From the 15th century to the 19th century: In the 15th century, bolts began to be used in combination with threads. People hand-made threads on screws with silver or copper, which were mainly used in industries such as armor, muskets, and watchmaking. In the middle of the 16th century, Europeans began to use simple lathes to make metal bolts and nuts, but they still mainly relied on manual production. In the 18th century, the Industrial Revolution accelerated the development of bolts. The emergence of precision lathes enabled bolts to be mass-produced, and gradually unified specification standards appeared. Bolts began to become important parts in machinery and construction.
From the early to the middle of the 20th century: In 1908, Canadians invented the square slot screw, which was "the first grooved fastener suitable for production use", and soon invented the square head screwdriver. The related technologies and tools for square bolts gradually developed. In 1932, the flat-head and cross-head concave screws were invented and widely used in automobile manufacturing, promoting the diversified development of screws and related tools, and indirectly influencing the expansion of the application scenarios of square bolts.
From the late 20th century to the present: With the development of industrial technology, the requirements for the precision, strength, corrosion resistance and other aspects of bolts in various industries have been increasing day by day, and the standards for square bolts have also been constantly updated and improved. For instance, China's GB/T 8-2021 standard has unified the reference of thread standards, enhanced production accuracy and product universality, and also added technical requirements for non-electrolytic zinc sheet coating, improving the corrosion resistance of bolts. Internationally, the German Institute for Standardization has released standards such as DIN 186 and DIN 480, which regulate square Neck head bolts, square head bolts with shoulders and semi-cylindrical journal end caps, etc., to ensure their consistency and safety in different application scenarios.
Product：customizable-carbon-steel-square-bolt
