Fischer window frame screw FFS TX30 flat head Cost-effective screw installation without plugs. For all solid and perforated building materials. Fast series installation due to small drill hole diameter of 6 mm. Stress-free, durable fixing of the frame. Continuous thread prevents the frame from being pulled. Power-saving installation: Special thread reduces force required for screwing. The fischer window frame screw FFS with flat head is a special screw for cost-effective assembly of window frames. After drilling, the screw can be directly driven into solid and perforated building materials. The continuous special thread prevents window frames from being pulled against the substrate. This is then fixed in a stress-free, durable manner. Applications Window frames made of wood, plastic and aluminium Door frames Squared timbers Building Materials Approved for: Concrete Vertically perforated brick Hollow blocks made from lightweight concrete Perforated sand-lime brick Solid sand-lime brick Solid brick made from lightweight concrete Solid brick Aerated concrete Approved for: 14-000559-PRO2 Installation Note the drill hole and screw-in depths for the different building materials listed in the table. Recommended for installation of plastic and aluminium profiles. Cylinder head screws are recommended for recessed installation in wooden profiles.