Rack Bolts

Mortice Security Bolts for Internal & External Doors

Rack bolts, often referred to as door security bolts or concealed door bolts, are a highly effective way to add an extra layer of protection to both external and internal timber doors. Unlike surface-mounted hardware, these security bolt locks are designed to be fitted into the top or bottom edge of a door, remaining hidden from view when closed to offer discreet yet reliable security.

These concealed door security bolts are particularly popular as front door bolts, but are equally effective for back doors, garage doors, and even windows. Because the heavy duty mechanism is recessed entirely into the door, they are incredibly tamper-resistant, providing peace of mind without altering the aesthetic of your ironmongery.

Our range includes traditional mortice rack bolts for doors in various sizes—including small bolts for doors with narrow stiles—as well as sets with matching thumb turns. Available in finishes such as Polished Chrome, Satin Brass, and Black, they can be paired with existing hardware for a consistent look. Whether you’re searching for a bolt for a front door or upgrading commercial premises, these remains a trusted choice for discreet, effective locking.

Frequently Asked Questions

What are the benefits of using a rack bolt lock?

A rack bolt lock provides "hidden" security. Because it is morticed into the door leaf, it cannot be easily reached or unscrewed by an intruder from the outside. They are an ideal security bolt for those who want maximum protection with a minimal visual impact on the door's design.

Are these suitable as heavy duty door bolts for external use?

Yes. While they are small, their internal steel construction makes them heavy duty enough to act as a secondary locking point on external front and back doors. We recommend installing them in pairs (one at the top and one at the bottom) for the highest level of security.

Do I need a special key for a concealed door security bolt?

Standard rack bolts are operated using a splined key (also known as a star key), which moves the internal gear to throw the bolt. Alternatively, you can use a matching thumbturn on the internal side for easy operation without a key, which is common for bathroom doors or emergency exits.

Can I install these as small bolts for doors with thin frames?

Yes, we provide various lengths. If you are looking for small bolts for doors or windows with limited depth, our 60mm rack bolts are the standard choice for narrower timber frames.