ProFix 4 in Fire-Rated Door Hinges, 3 Pieces

What it is for

A door hinge is bought by length and thickness first, because the recess in the door edge is already cut: a 4-inch hinge will not drop into a 3-inch mortice, and a thin hinge in a deep mortice leaves the door hanging on the screws. Everything else — finish, ball bearings, fire rating — comes after the size.

Ball-bearing hinges are for heavy doors that are opened constantly, where the load should go into the bearing rather than the pin. Fire-rated hinges are thicker and matched to intumescent pads; on a fire door the pair has to be replaced as a set, not individually.

Specification detail

3 hinges, 4 in, Fire-Rated, in carbon steel with a black oxide finish finish, with matching screws. The knuckle is machined rather than rolled, so the pin stays tight after the door has been swung a few thousand times.

• 4 in by the standard thickness, so it drops into the existing mortice
• Machined knuckle keeps the pin tight rather than developing play
• carbon steel with a black oxide finish finish, including the countersunk screw heads
• Supplied by the set: three hinges per standard door, six for a wide one

After-sales

Two-year warranty against manufacturing defects. Spare parts and wear items are kept in stock for the models we sell, so you are not forced to replace a whole assembly over one worn component. Warranty support is handled by e-mail in English, German or French.