Infly Fasteners is a manufacturers and factory of roofing bolt and mushroom head with slot machine roof screw, we are according to the standard NFE25129,In fact, the roofing bolt also called mushroom head with slot machine screw, because the head is shaped like a roof, so also known as the roof screw, using the general standard have French standard NFE25129, mainly used in wood structure and architectural decoration industry, that together with the hex nuts, square nuts with angle.

The available in roofing：
Standard: French standard NFE25129
Size: M5-M10 Length 20-100mm
Material: Class 4.8, Carbon Q195 or 1008 Non heat treatment
Surface: White Zinc, Blue