( HEXAGON WASHER HEAD SELF DRİLİNG SCREWS ) 

Trapezoidal screw is an auxiliary fastener in the construction industry. It is used in the mounting of metal to metal or wood to metal in areas such as exterior surfaces and roofs. The trapezoidal screw is mounted using the socket tool and the drill tool. It has a scaled gasket under the head to prevent leakage.

Upon request, surface coating applications such as electro galvanization, zinc nickel, phosphate (black) and dacromet/geomet are made.