Fireproof hinges: The number of hinges required for each door leaf depends on the height of the door. If the door height exceeds 1800mm, three hinges are recommended; for doors shorter than 1800mm, two hinges are sufficient. This ensures proper alignment, stability, and smooth operation, especially for heavier or larger doors.
Locks: For pipe well doors, standard pipe door locks are typically used. In machine rooms, fire-rated locks are required for equipment doors. For double fan-type fire doors, specific fire door locks must be installed. For passage doors, you can choose between fireproof locks, aisle locks, or handle mechanisms. Only these three options are acceptable, and the choice should be made by the consumer based on their needs. It's essential that all lock components used together are clearly specified in the contract to avoid confusion during installation.
Door closers: Fire doors, except those in pipe wells, must be equipped with door closers. Each single door requires one closer, while double doors need two. For steel fire doors, especially those with large fan (main door) configurations, a door closer is necessary only on the main door. Proper installation of door closers ensures that doors close automatically and securely, which is crucial for fire safety.
Secondary devices: When installing double doors with two door closers, it's important to add a sequencer. This device ensures that the doors open and close in the correct sequence, preventing misalignment and improving overall functionality.
Fireproof latches: For double fire doors that use fire locks or aisle locks, two fireproof latches should be installed on the door leaf without a lock. Each door leaf should have one latch. This helps maintain the integrity of the door assembly and ensures that both doors remain closed properly in case of an emergency.
Tapping Screw
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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