Bolt Latches
The bolt latch, also known as a crossbar, is composed of two adjacent surfaces fastened by a bolt which physically prevents them from opening. This is one of the most basic latches available. Also one of the most common latches, the bolt latch is used on inspection panels, gates, hotel, house and other hinged doors. The popularity of this latch can be credited to its simple yet effective design and low cost. The single bolt, double bolt and cane bolt are the most widespread types of bolt latches which can be fitted to a barrel, rotary, slam or spring pull system. No matter the specific type, bolt latches can be made of a variety of materials such as aluminum alloy, stainless steel, zinc, cast iron and thermoplastics.
The bolt latch consists of two plates and one or more bolts or posts. The plates are attached to two adjacent surfaces, most often a door and the frame. Each plate has a cleat through which the post is inserted. Sliding the post through both cleats secures the latch. The latch is disengaged simply by pulling the post out of one of the cleats allowing the surfaces to part. The cane bolt latch is also a spring latch. The spring is placed between the cleats and is attached to the bolt propelling it through both cleats until the pin is pulled back, recoiling the spring. Common manufacturing process for all bolt latches include plating and stamping, often followed by spot welding during assembly.