Door Bolt FAQs - Your Questions Answered

Door bolts come in many shapes and sizes. While our blog "30 Types of Door Bolt" dives deep into the different styles, here we’ve compiled quick, straightforward answers to some of the most commonly asked questions about door bolts.

Q: Do I need to use bolts on tall doors?

A: The word "need" is strong, but we definitely recommend using door bolts on the top and bottom of tall doors unless they already have a multipoint espagnolette lock or a cremone bolt installed.

Why? Bolts add extra security by reinforcing the door’s position in the frame. They also help prevent warping or bowing over time. Cranked or straight bolts on single or French doors can improve weather sealing, reduce drafts, and enhance privacy. On tall double doors, bolts can secure the second leaf while allowing the main one to open freely.

Q: What are the parts of a door bolt called?

A: Although the exact name may vary depending on the type, there are typically three main components:

1. The shoot – the moving part that extends into the frame.
2. The body or backplate – the fixed part mounted on the door.
3. The handle – the part you turn to operate the bolt.

Q: How many hinge bolts per door?

A: Security hinge bolts are usually sold as a pair. One pair should be installed per door leaf. So if you have two outward-opening doors, you’ll need two pairs of hinge bolts in total.

Q: Can you bolt a fire door?

A: Yes, you can install a bolt on a fire door—but it depends on the type of bolt and the specific fire rating of the door.

For final exit or fire exit doors that require single-action egress, panic bolts can be used. These are typically operated with panic bars or push pads. For doors that are designated as "Fire Door Keep Locked," flush bolts can be installed on the edge of the second leaf of a pair or half-door setup, along with the correct intumescent ironmongery. The primary leaf should remain non-locking and keep shut.

Single fire-rated doors can be equipped with CE/UKCA marked deadbolts, such as deadlock, sashlock, lever locks, or cylinder locks. Always ensure proper intumescent protection is in place.

Q: Can you fit a security bolt on a fire door?

A: If you're referring to a mortice door bolt, the answer is no—you cannot install a rack bolt on a fire-rated door. These types are not CE/UKCA certified or tested for use on fire doors.

However, other types of bolts—like those designed for fire-rated doors—can be used on doors that are kept locked. Just make sure to choose the right product and installation method.

Q: Can you use a drop bolt on a fire door?

A: Drop bolts, such as garage-style ones, are not suitable for fire-rated doors. They are not CE/UKCA marked or tested for this purpose.

If you need to hold a fire door open, consider using compliant alternatives like Dorgard, Dorgard SmartSound, or UNION DoorSense. These devices allow the door to close properly in case of a fire. For locking or holding a fire door closed, options like door closers or access control systems are also available. Contact us today to discuss your specific needs.

Q: Can you put a bolt on a UPVC door?

A: Yes, there are several specialized bolts available for UPVC doors. These include concealed shoot bolts and surface-mounted door bolts, which are designed to work effectively with the material without compromising its integrity.