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This is a hexagonal bolt with a washer pre-assembled, and is also called a hexagonal bolt with a built-in washer. After trimming and molding the hexagonal head (trimmer) and incorporating a washer, the thread is formed by rolling. After rolling, the thread diameter of the screw will be larger than the inside diameter of the washer, and it will not come off. Like regular washers, it has the effect of preventing the seat from sinking and loosening. Eliminates the hassle of installing washers and the trouble of forgetting to install them or falling off washers. Increase work efficiency and save time and effort. There are many types, standards, and combinations of washers, and they are popular for use in automobiles and machinery, as well as as replacement parts for conventional bolt and washer combinations. The name "SEMS" comes from the registered trademark of ITW (Illinois Tool Work), which developed and patented washer-mounted screws in the 1930s. We named it SEMS by adding the plural “S” to the string “SEM” which is included in the English word “pre-asSEMbled washers and screws” as it is generally bought in boxes. .
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Tory MassemsProduct
BoltHandling Company
Bossard Co., Ltd.Categories
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