Latches & Tower Bolts — Complete Guide
Latches and tower bolts are simple yet essential door & window fasteners that hold them closed and provide a basic level of security. A tower bolt is a sliding bolt mounted vertically / horizontally that slides into a socket to secure the door. A latch holds the door shut (often spring-operated), and an aldrop (door clamp) is a heavy hasp-and-staple used with a padlock on main doors / gates. They complement hinges, locks & handles in a complete door hardware set.
Indian bolts & latches follow IS 204 (Tower Bolts). Major brands: Godrej, Dorset, Ozone, Harrison, Argent, Plaza, Ebco, Kich.
Tower Bolts
| Type | Description | Use |
|---|
| Standard Tower Bolt | Sliding bolt + socket | Doors, windows (top & bottom) |
| Heavy-Duty Tower Bolt | Thicker bolt | Main doors, gates |
| Auto / Spring Tower Bolt | Self-latching | Self-closing doors |
| Concealed / Mortise Bolt | Recessed in door edge | Premium / flush look |
| Flush Bolt | Flush with surface | Double doors (inactive leaf) |
| D-Type / Square Tower Bolt | Different grip styles | Aesthetic variants |
Latches
| Type | Description | Use |
|---|
| Spring Latch | Auto-latch on closing | Interior doors |
| Slide Latch / Bolt | Manual sliding latch | Bathrooms, gates |
| Hook Latch | Hook & eye | Light doors, windows |
| Magnetic Latch / Catch | Magnetic hold | Cabinets, light doors |
| Roller / Ball Catch | Spring ball catch | Cabinet / wardrobe |
| Gate Latch | Heavy duty | Gates |
| Thumb Latch | Lever-operated | Traditional doors |
Aldrop / Door Clamp
An aldrop (also called door clamp / kunda) is a heavy hasp-and-staple device used on main doors & gates — the swinging arm drops over a staple, and a padlock secures it. Available in straight, curved (Z-type) and concealed designs in SS / brass / iron.
Sizes
| Item | Common Sizes |
|---|
| Tower Bolt | 4", 6", 8", 10", 12" (length) |
| Aldrop | 8", 10", 12" |
| Slide Latch | 3", 4", 6" |
| Bolt Diameter | 10–16 mm (heavy) |
Materials & Finishes
| Material | Quality |
|---|
| Stainless Steel (SS 304) | Best — rust-proof, durable |
| Brass | Premium, corrosion-resistant |
| Zinc Alloy | Economical, finishes well |
| Aluminium | Light, modern |
| Iron / MS | Economy (rusts) |
Finishes: satin SS, chrome, antique brass, matte black, powder coat.
Where to Use
- Main doors (tower bolts top & bottom + aldrop)
- Bedroom & bathroom doors (latch / bolt)
- Windows (tower bolts / latches)
- Gates (heavy tower bolt / aldrop)
- Double doors (flush bolts on inactive leaf)
- Cabinets & wardrobes (magnetic / roller catch)
- Balcony & utility doors
- Storage rooms (aldrop + padlock)
Top Brands
| Brand | Products |
|---|
| Godrej | Tower bolts, aldrops, latches |
| Dorset | SS bolts & latches |
| Ozone | Door hardware |
| Harrison | Bolts & security |
| Argent / Plaza | Bolts, latches |
| Ebco / Kich | SS hardware |
Advantages
- Simple, reliable closing & basic security
- Economical
- Easy to install & operate
- SS / brass options rust-proof
- Wide size range
- Aldrop allows padlock security
- Self-latching (spring) options
- Aesthetic finishes
- Low maintenance
- Suitable for doors, windows, gates, cabinets
Disadvantages
- Basic security only (not a lock)
- Cheap MS / iron rusts & jams
- Surface-mounted bolts visible
- Can loosen over time
- Coastal areas corrode non-SS
- Counterfeit branded products common
- Spring latches wear out
Cost (Approximate, Indian Market, 2025-26)
| Item | Cost |
|---|
| SS Tower Bolt 6" (each) | Rs 60 – 200 |
| SS Tower Bolt 10–12" (heavy) | Rs 150 – 450 |
| Brass Tower Bolt | Rs 120 – 400 |
| Aldrop (SS, 10") | Rs 150 – 600 |
| Slide Latch | Rs 40 – 200 |
| Magnetic / Roller Catch | Rs 20 – 100 |
| Concealed Bolt | Rs 200 – 800 |
Best Practices
- Use SS 304 / brass bolts (rust-proof)
- Use tower bolts at top & bottom of main doors
- Use heavy-duty bolts / aldrop for gates & main doors
- Use SS / brass in coastal / humid areas
- Install with proper screws into solid frame
- Use flush bolts on inactive leaf of double doors
- Lubricate sliding bolts periodically
- Match finish with other door hardware
- For security, combine bolts with a proper lock
- Buy genuine branded products
- Use aldrop + good padlock for storage / gates
Applicable Standards
| Standard | Description |
|---|
| IS 204 (Part 1–2) | Tower Bolts |
| IS 207 | Gate & Shutter Hooks & Eyes |
| IS 281 | Mild Steel Sliding Door Bolts |
| IS 7534 | Sliding Door Bolts for Use with Padlocks (Aldrops) |
| IS 1019 | Rim Latches |
| EN 12051 | Door & Window Bolts (international) |
Conclusion
Latches & tower bolts are simple, economical hardware that secure doors, windows and gates closed. Use SS 304 / brass for rust-free durability, heavy-duty bolts & aldrops for main doors & gates, and flush bolts on double doors. They provide basic security — for real security, always pair with a proper lock.
These work with hinges, locks & handles and are fixed using screws & fasteners to complete door / window assemblies.