Door Locks and Digital Locks Buying Guide for Coimbatore Homes
No scriptA good lock is the first line of home security. Hardware shops in Coimbatore stock everything from simple padlocks to fingerprint smart locks, and the choice can be confusing. This guide explains the main types of locks, what to check for your door, and how to get them installed properly.
Know Your Door First
Before you shop, note:
- Door material: solid wood, flush door, steel, UPVC or aluminium. Each needs a suitable lock.
- Door thickness: many locks work only within a certain thickness range.
- Which way the door opens and whether it is left- or right-handed.
- Existing cut-outs: replacing a lock with one of the same size is easier than making new holes.
Take photos and measurements to the shop.
Types of Locks
- Mortise lock: fitted inside a pocket cut into the door edge, with a handle and keyhole. Common on main and bedroom doors. Strong when fitted well.
- Rim lock (night latch): mounted on the inside surface of the door; often used as an extra lock on main doors.
- Deadbolt: a solid bolt operated by key or thumb-turn; adds security to a main door.
- Cylindrical and tubular locks: knob or lever sets for internal doors, bathrooms and bedrooms; simpler and lighter duty.
- Padlocks: for gates, grills, sheds and shutters. Choose a hardened shackle and a weather-resistant body for outdoors.
- Tower bolts and aldrops: simple sliding bolts used with padlocks on doors and gates.
- Digital and smart locks: open with a PIN, fingerprint, card, phone app or key.
The Lock Cylinder Matters
On most key locks, the cylinder (the part with the keyhole) decides how hard it is to pick or copy the key. Ask about:
- The number of pins or levers.
- Computerised (dimple) keys or restricted keys that are harder to copy.
- Anti-snap or anti-drill features on premium cylinders.
Digital and Smart Locks
Digital locks are popular for apartments and villas. Before you buy, check:
- Access methods: PIN, fingerprint, RFID card, app, mechanical key. More methods give flexibility, but each one should be secure.
- Backup: what happens if the battery runs out or the electronics fail. Look for a mechanical key or an emergency power contact.
- Battery: type, expected life and low-battery warning.
- Door compatibility: thickness range and whether it fits a wooden, steel or UPVC door.
- Weather: if the door faces rain or direct sun, ask whether the outer unit is rated for it.
- Auto-lock and privacy modes: useful, but make sure you cannot be accidentally locked out.
- App and data: if the lock connects to Wi-Fi or Bluetooth, ask where access logs are stored, how updates are delivered, and use a strong app password.
- Fire and emergency exit: the inside handle should open the door easily in an emergency without needing a code.
Try the lock in the showroom: fingerprint speed, keypad feel and how easily elderly family members can use it.
Installation
- Use a carpenter experienced with the lock type, or the brand's installer. Our guide to choosing a carpenter in Coimbatore explains what to check.
- The cut-out must be accurate; a loose or misaligned lock is weaker and wears out quickly.
- Check that the strike plate on the frame is fixed with long screws into solid wood or the frame.
- After fitting, test the lock many times with the door open and closed, from both sides.
- For digital locks, set a new master PIN and delete any default codes immediately.
Strengthen the Whole Door
A strong lock on a weak door or frame is not enough.
- Check that the frame is solid and firmly fixed to the wall.
- Use good hinges with long screws.
- Consider a safety door or grill in front of the main door.
- Add a door viewer or video door phone to see visitors before opening.
For wider home security, a camera at the entrance helps; see our CCTV installation buying guide.
Warranty and Keys
- Ask about the warranty on the mechanism and, for digital locks, the electronics, and where service is available in Coimbatore.
- Keep the key card or code that some brands provide for making duplicate keys.
- Keep spare keys safe and know who has copies.
- When you move into a rented or resale house, change the lock or cylinder; you cannot know who has old keys.
Look After Your Locks
- Lubricate key locks with a suitable lock lubricant as the maker advises.
- Do not force a stiff key; get the lock checked.
- Replace digital lock batteries at the first warning.
- Clean fingerprint sensors gently with a soft dry cloth.
Next Steps
Measure your door, choose the lock type for each door, compare cylinder security and backup options, get it fitted by a skilled installer, and change old locks when you move in. You can find hardware shops and lock dealers in the Kovai Yellow Pages directory.
Frequently Asked Questions (FAQ)
Which type of lock is best for a main door?
Main doors usually use a mortise lock fitted inside the door, often with an extra deadbolt or a rim lock for added security. Digital locks are another option. The right choice depends on the door's thickness and material, and on how you want to lock and unlock it.
What happens to a digital lock when the battery runs out?
Most digital locks warn you when the battery is low, and many have a backup such as a mechanical key or an external emergency power contact. Ask about the backup option before you buy and change batteries when the warning appears.
Who should install a mortise or digital lock?
A carpenter experienced with locks, or the brand's own installer, should fit it. The lock must match the door thickness and the cut-out must be precise, or the lock may jam or be weak.
How many keys should I get?
Locks come with a set number of keys. Keep a spare in a safe place, know who has copies, and consider locks with restricted key profiles if you worry about unauthorised copies.