Description
Satin Stainless Steel Ball Bearing Hinge 4" Grade 7 FD30/FD60
- Graded hinges are fire rated.
- Suitable for commercial applications, typically used on fire doors and heavier standard doors.
Graded hinges have different specifications dependent on the grade that is achieved in testing. It is important to understand the differences in specification when selecting the hinge to ensure it is compatible with the door and other hardware being fitted; ensuring the door does not sag and operates smoothly. Please see the table and other guidance information below to select the correct hinge grade for the door mass:
GradeDoor Mass (kg)
Door closers increase the loading on hinges and the rate at which they wear.
Door closers without a backcheck increase the door mass by 20%* while door closers with a backcheck increase the door mass by 75%**.
Hinges should be selected according to the total mass; actual door mass plus the mass added by the door closer.
- It is recommended that three hinges are used on timber doors when fitting with a door closer.
