Vis à tôle à grosse tête st3, 9x9, 5 type j De Dietrich BRO329130

This sheet metal screw features a large head and a type J design, with dimensions of ST3.9x9.5 mm. It is ideal for fastening components in boiler and burner enclosures, providing a secure hold with a wide bearing surface. The self-tapping thread ensures easy installation into metal. A versatile fastener for heating equipment assembly and repairs.