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Steel Door Locks

A steel door lock resists attack by securing the leaf at several points rather than one. This page covers the difference between multi-point, hook bolt and pin bolt types, and what to measure before replacing one. The catalogue holds 31 models.

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Multi-point, hook bolt and pin bolt

In a central multi-point lock, turning the key drives the side bolts together with vertical rods running to the top and bottom edges of the leaf, so the door locks in three directions at once. Semi-central systems drive some of those points.

Hook bolts hook into the keep plate as they throw and stop the leaf being pulled away from the frame — particularly effective against lifting and levering. Pin bolt types drive cylindrical pins into the keep instead. Monoblock locks combine the whole mechanism in a single body.

Frequently Asked Questions

  • What is a multi-point lock?

    One where turning the key drives vertical rods to the top and bottom edges of the leaf as well as the side bolts, locking the door at several points.

  • What is the advantage of a hook bolt?

    It hooks into the keep plate as it throws and stops the leaf being pulled away from the frame — far more effective than a straight bolt against lifting and levering.

  • Can I replace my existing steel door lock?

    Yes, if the replacement comes from the same dimension family. Compare centre distance, backset, rod connection type and faceplate length against the existing lock.

  • Is the cylinder chosen separately?

    Yes. Steel door locks also work with a cylinder, chosen by leaf thickness — usually in the 83-90 mm range.

  • Does changing the lock raise the security level?

    The cylinder matters as much as the lock. Pairing a multi-point lock with a ball-pin or anti-pick cylinder makes far more difference than changing the lock alone.