Detailed information:

1)Name:Industrial door screw(Square head screws)
2)Specification:9*40

3)Specifications: equilateral quadrilateral, nut diameter of 10mm, screw thick 9mm, 40mm screw length

4)The company's other screw nuts are: British self-tapping, metric self tapping, coach screws, screw 8 * 25 8 * 36 screws, 8 x 39 screws, 8 x 48 screws, etc.