Latchs

Bolt latches
Bolt latches, also known as latch bolts, are straightforward latching mechanisms that include a bolt, a handle, a backplate, a set of barrels, and a box called a striker. The barrels hold the bolt in place and secure the latch. They form a non-continuous loop that allows the handle to pass through. A bolt latch can be locked or unlocked by sliding the bolt into the socket.

Spring latches
Spring latches can be constructed in various ways. A typical spring latch consists of an L-shaped bolt, known as a plunger, which features a small hole for inserting a clip or pin. The backplate is designed with two lips, each with a hole, to secure the plunger. A spring is positioned between the lip and pin to maintain the plunger in its extended position.

Slam latches
Slam latches, also known as push-to-close latches, are designed for doors that need to latch automatically when closed. Instead of using bolts, slam latches employ cams to engage with the striker or door frame. They typically have a rounded or chamfered edge to facilitate retraction upon impact with the striker. A spring-loaded mechanism keeps the cam in the raised position. When activated, the cam either turns or slides into place.

Swinging latches
Swinging latches, also known as swinging door latches, operate similarly to slam latches. These push-to-close latches automatically engage when the door is closed. They feature a spring-loaded mechanism that keeps the bolt extended, with a rounded edge on the bolt to facilitate smooth retraction upon impact with the striker.

Cam latches
Cam latches are frequently used in furniture such as drawers and cabinets. They operate by turning a knob or key, which rotates an arm on the opposite side of the door. Like other quarter-turn devices, cam latches rely on a simple mechanism without needing a strike plate, box, or hole on the frame. Instead, they lock the door or enclosure by blocking only one side, making them unsuitable for doors that swing or extend beyond the frame.