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This is a hexagonal upset bolt with a flat washer (JIS standard) built into it to prevent loosening and sinking. Washers are pre-installed in the screw manufacturing process, which prevents forgetting to install or falling off on-site, and eliminates the hassle of assembling, contributing to a reduction in work time. The head is a rounded hexagonal column with a slightly concave top and a cross groove in the center. Therefore, it can be tightened with a variety of tools such as box wrenches, spanners, and Phillips screwdrivers, making it suitable for locations where multiple people handle it or where frequent attachment and detachment is required. Also, because of its relatively soft appearance, it is sometimes used for decorative purposes. This screw, which was developed in the United States in the 1930s and introduced to Japan, consists of two pieces: a screw and a spring washer (2 pieces), and a three-piece screw, SW, and flat washer. is now called [P=3]. After that, it became customary to call them by a combination of letters and numbers, such as [P = 1] for plain washers only, and [I] instead of [P] when the washers meet ISO standards. This is a convenient product that allows you to choose combinations depending on your application.
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See all 10 models in listPart Number
Hexagon upset semsProduct
Machine screw/micro screwHandling Company
Bossard Co., Ltd.Categories
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