If it is known at time of manufacture that steel doors will be fitted externally and open outwards, it is likely that security hinges with integral security studs (sometimes called dog bolts) will be used. These improve door to frame security since one of the most common ways to compromise an outward opening external door is to hacksaw or knock out the hinge pins and then lever the door out of its frame.
However, not all doors in these vulnerable situations are hung on hinges with integral security studs so a separate independent hinge bolt may be required. For this reason we have developed the Z480 and Z490 independent bevel hinge bolts. They are an additional security product, designed for retro-fitting to existing external steel doors and frames, to combat the possibility of perimeter outward opening doors being levered out of the frames if hinge pins are tampered with. The bevel hinge bolt is surface mounted on the inside of the door and two slots cut in the frame to accommodate the bevel bolts as the door closes into the shut position. In this way the bevel bolts engage each time the door is closed and disengage when it is opened.
They are manufactured from zinc plated mild steel and powder coated silver grey. It is recommended to use two bevel hinge bolts on each door leaf, one high just below the top hinge, and one low just above the bottom hinge. It is not handed and will suit either hand of door.
It was originally designed for fitting to steel doors so the frame plate may not be necessary if two slots are cut in the metal door frame to receive the bevel bolts, each slot measuring 20mm wide x 12mm high. It can also be fitted to existing timber doors, in which case the 30mm wide x 100mm high frame plate will fit over the two holes made in the frame. For this reason, the bevel hinge bolt can be supplied with or without the frame plate.
The Z480 and Z490 are ideal for industrial applications, pumping stations, plant rooms, electrical sub-stations etc. Not to be used in public areas due to ligature risk. There is no advantage in using products like these on inward opening doors.