Door Bolt FAQs - Your Questions Answered

Door bolts come in a wide variety of styles and sizes. While our blog "30 Types of Door Bolt" dives deep into the different options, here we've compiled some quick, straightforward answers to common questions about door bolts.

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

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

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 double doors, bolts can secure the secondary leaf while allowing the main one to open freely.

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

A: Regardless of the type, most door bolts consist of 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 used to operate the bolt.

Q: How many hinge bolts per door?

A: Security hinge bolts are sold as a pair. One pair should be installed per door leaf. So, for a pair of outward-opening doors, you would need two pairs of hinge bolts.

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 requirements of the fire door.

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

Single fire doors that are kept locked can be equipped with CE/UKCA marked deadbolts, such as deadlock, sashlock, lever locks, or cylinder locks. Always ensure proper intumescent ironmongery is in place to maintain fire safety.

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 — these cannot be installed on fire-rated doors. They are not CE/UKCA certified or tested for use on fire doors.

However, other types of bolts can be used on fire doors that are meant to stay locked, as long as they meet fire safety standards. Just avoid using mortice-style security bolts.

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

A: Drop bolts, such as those used for garages, 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 automatically during a fire. For locking or keeping a fire door closed, solutions like door closers or access control systems may be appropriate. 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, including concealed shoot bolts and surface-mounted options. These are designed to work effectively without compromising the integrity of the door material.