Turning a doorknob retracts the end of a bolt or latch from an opening in a strike plate on the face of the door jamb allowing the door to open.
													
																	Door lock spring mechanism. 
									
	
		
	
																	Extension springs 4 pack come in two sizes to accommodate a variety of applications. 
																	Spring bolt a spring latch is a bolt held in place by a spring clip. 
																	A slam latch uses a spring and is activated by the shutting or slamming of a door. 
																	If installing on an entry door pair it with a modern deadbolt for security ideal for large interior doors it comes with matching un lacquered brass knobs trim and a pair of impressive skeleton keys. 
															
													
									
	
		
	
																	This type of door generally locks automatically when closed. 
																	Deadbolt a deadlatch does not have the spring loading mechanism. 
																	This massive cast iron rim lock is faithfully reproduced from an early 19th century original used on entry doors. 
																	A locking mechanism used with a latch bolt. 
															
													
									
	
		
	
																	And the everbilt 5 8 in. 
																	The slam latch derives its name from its ability to slam doors and drawers shut without damaging the latch. 
																	The best lock for a wooden door is a lock that meets the requirement of bs3621 the type of lock fitted can be a night latch mortice deadlock or mortice sash lock. 
																	The spring is compressed to unlock the bolt and when released it snaps into a locked position. 
															
													
									
	
		
	
																	Spring bolt lock or night latch. 
																	It can be locked or unlocked at any time using. 
																	How to fix a doorknob s bolt mechanism. 
																	Like all latches a slam latch is a mechanism to hold a door closed. 
															
													
									
	
		
	
																	The everbilt 5 8 in.