Mortise Locks

Lever mortise locks, knob mortise locks, and sliding bolt locks for main entrance doors, room doors, and bathroom or storage doors — T21's mortise lock collection covers every residential and commercial locking application across India. Standard 60mm backset fits most Indian residential doors. Standard 8mm square spindle is compatible with all T21 lever and knob handle sets. Multi-point mortise locks with simultaneous top, middle, and bottom bolt deployment are available for main entrance security applications. Bulk contractor pricing with GST invoice available. Shipped from Bengaluru.

The functional distinction between single-point and multi-point mortise locks is the most important specification decision for Indian main entrance doors. A single-point mortise lock deploys one deadbolt at the centre of the door — the standard specification for interior room doors and secondary entrance doors. A multi-point mortise lock deploys three bolts simultaneously at the top, middle, and bottom of the door frame when the key turns, distributing locking force across the full door height and making forced entry significantly more difficult. For any ground-floor apartment or independent home main entrance in India, multi-point is the recommended specification over single-point.

What is the difference between a single-point and a multi-point mortise lock for Indian main doors? A single-point mortise deploys one deadbolt at door centre — standard for interior doors. A multi-point mortise deploys bolts simultaneously at the top, middle, and bottom of the door frame when the key turns, distributing force across the full door height. For main entrance doors, multi-point provides significantly greater resistance to forced entry.

What backset measurement should I specify for a standard Indian residential mortise lock? 60mm is the standard backset for Indian residential doors — the distance from the door edge to the keyhole centre. 70mm and 80mm backsets apply to thicker commercial doors above 50mm. Always confirm the backset before ordering, as an incorrect measurement requires additional door edge routing that cannot be reversed.

Are T21 mortise locks compatible with door handles from other Indian hardware brands? T21 mortise locks use a standard 8mm square spindle and 60mm backset — the most common specifications across Indian hardware manufacturers. Compatibility with other Indian-standard lever and knob handle sets is generally high. Confirm spindle length matches your door thickness before ordering, as thicker doors require proportionally longer spindles.