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Compared to a typical pot head, the head is rounder and thicker, making it more like a hemisphere. There are two types of recesses: a positive (+) type and a slotted type that can be turned using a flathead (-) screwdriver. "Slotted" has the advantage that water and dirt do not accumulate in the recess, making it easy to clean, and making it difficult to come out and lick the recess. Therefore, it is used in places with harsh environments such as around water or outdoors, and because it can be turned with a coin, etc., it is used for mounting screws for covers that are frequently attached and removed. In addition to metric threads, there are also Wit Unified standard products, as they are also used in old cars, motorcycles, antique furniture, etc. Slotted fastening screws have a long history and were widely used in the mid-15th century. At that time, the recesses were all made by hand, such as being carved using a hacksaw, and the precision was not high and they were expensive. In the 18th century, manufacturing mechanization and mass production progressed, and in the 19th century, standardization (Wit screw) progressed by Whitworth, contributing to the industrial revolution. It wasn't until the 20th century that Phillips grooves became popular.
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See all 10 models in listPart Number
Round machine screwProduct
Machine screw/micro screwHandling Company
Bossard Co., Ltd.Categories
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