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Stainless steel + hexagonal upset bolt
The head has a hexagonal shape with a cross hole. It can be tightened using either a Phillips screwdriver or a wrench. It is compliant with EU RoHS standards.
Stainless steel + hexagonal upset bolt with spring washer
The head has a hexagonal shape with a cross hole. It can be tightened using either a screwdriver, a spanner, or a wrench. The washer does not come off the screw, which saves the hassle of setting the washer and improves work efficiency. It is also referred to as a Sems screw. It is compliant with EU-RoHS standards.
