Profile: Caldwell Hardware (UK) Ltd. manufactures window hardware products and systems for the window & door industry. We provide sliding, pivot & casement windows, sash balances, folding openers, hinges, catches and window restrictors. Our double sprung spiral sash balances allow smooth operation,and reduce the effort required. Our pivot window design incorporates friction loading adjustment and positive locating sash clamp plates for easy fitting or removal of the sash. Our pivot hinges have mounting plates to fit a wide range of frame profiles.