What is mortise lock with No hold back feature?

A "No hold back" feature on a mortise lock means the latch bolt always returns to its normal, extended (latched) position when the door closes, preventing it from being held retracted, even if you try to lock it back; it's designed for standard security where you want the door to latch automatically, with the holdback function (which retracts the latch) either absent or easily released, offering constant locking convenience without the need to disable a separate setting, unlike standard holdback locks where you set the retracted state.

How it Works (No Holdback vs. Holdback):

• Standard (No Holdback): The latch bolt is always ready to catch the strike plate when the door closes. You might use a key or thumbturn to retract it temporarily for passage, but it springs back into place automatically.
• With Holdback: You can activate a special setting (often by turning the key in a specific way while pressing the lever/knob) to keep the latch bolt retracted even when the door is closed, allowing free passage until you deactivate the holdback feature. 

Key Characteristics of a "No Hold Back" Mortise Lock:

Standard Operation: It functions like a typical commercial lock where the latch is always engaged unless operated by the lever/knob.
Security Focus: It emphasizes immediate locking and security, ideal for classroom or office entry points where you want the door to secure itself.
No Special Setting: There's no separate toggle or button to put the latch in a permanent "retracted" (holdback) state; it just latches.
Essentially, "No hold back" describes a lock function where the latch always performs its normal latching action, offering simpler, consistent security without the added feature of holding the latch back for temporary free passage.