F-clamp with high clamping pressure, large throat depth and wide opening. Fixed bracket and pressure plate are produced and tempered from a single piece for high torsion-resistance. Heat-resistant pressure plate is replaceable and can be tilted up to 35° so it can even clamp on angled or sloping surfaces. The tempered spindle is particularly sturdy and wear-resistant for increased durability. The sturdy tommy bar has special rounded hand-friendly ends, as well as a hexagonal bolt for powerful and controlled clamping. For use in steel construction, shipbuilding and automotive engineering. Also used in heavy timber construction, laminated wood beam construction and carpentry.