Door Bolt FAQs - Your Questions Answered

Door bolts come in many different styles and sizes. While our blog "30 Types of Door Bolt" dives deep into the various options, this article provides quick and clear 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 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 providing additional locking points. They also help prevent warping or bowing by keeping each door leaf more firmly in place within the frame. Cranked or straight bolts on single or French doors can improve sealing against drafts, weather, or for privacy. On tall 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: Although the exact design may vary, most door bolts consist of three main components:

1. The shoot – the part that moves when the bolt is engaged.
2. The body or backplate – the fixed part that's mounted to the door frame.
3. The handle – the part you turn or push 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.

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 or panic hardware can be used. These are typically operated by panic bars or push pads.

For doors marked “Fire Door Keep Locked,” fire-rated bolts like flush bolts can be installed on the edge of the second leaf of a pair and a half door set, along with the correct intumescent kit. The primary leaf would remain non-locking and keep shut.

Single fire doors labeled “Keep Locked” can be fitted with CE/UKCA-certified deadbolts, such as deadlock, sashlock, lever locks, or cylinder locks. Always make sure the appropriate intumescent ironmongery is included for full compliance.

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 kept locked, provided they meet the required standards. Just avoid using a mortice-style security bolt.

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 certified or tested for fire safety.

If you need to hold a fire door open, consider using compliant products like Dorgard, Dorgard SmartSound, or UNION DoorSense. These allow the door to close automatically during a fire. For locking or holding a fire door closed, solutions like door closers or access control systems are 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 designed specifically for UPVC doors. These include concealed shoot bolts and surface-mounted door bolts. They offer added security without compromising the aesthetics of the door.