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This screw has a hexagonal head with a slight recess at the top. They are also called upset bolts or upset machine screws. It has cross recesses and plus/minus (±) holes, so it can be tightened with various tools such as spanners, box wrenches, drivers, etc. Therefore, it is also used in places where it is frequently removed or where multiple people are putting it on and taking it off. It gives a softer impression than hex bolts, so it is also used in places where it is easily seen. The built-in washer (SEMS) type helps improve work efficiency.
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See all 10 models in listPart Number
Hexagon upset boltProduct
Machine screw/micro screwHandling Company
Bossard Co., Ltd.Categories
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