19 Feb, 2026 Think about all the doors in your home for a second.
Front door. Back door. Bedrooms. Bathroom. Maybe a balcony door or a garden gate. Each one needs to lock. Each one needs to keep you safe.
Now think about how they lock. Some have handles with built-in locks. Others use a simple tower bolt. You slide it across and the door stays shut. Simple. Reliable. Works every time.
But here is the catch. Not all tower bolts are made the same. Some are good. Some are cheap junk that rust and stick. And with new government rules, some are not even legal to sell anymore.
Today we are talking about SS Towerbolt ISI certified hardware from CROWN ISI. What makes it different. Why safety matters. And how to pick the right one for your modern doors.
What Is A Tower Bolt?
Let us start with the basics so we are on the same page.
A tower bolt is a simple sliding lock. You see them on doors and gates everywhere . It has three parts.
The barrel is the long tube that holds the mechanism. The bolt is the metal rod that slides back and forth. The catch plate is what the bolt slides into to lock the door.
You put the barrel on your door. You put the catch plate on the door frame. Slide the bolt into the catch plate and your door is locked. Pull it back and the door opens.
Simple design. Nothing complicated. But simple does not mean easy to make well.
The good ones use quality metal and are made with care. The cheap ones are rushed and fail fast.
CROWN ISI makes their SS Towerbolt 304G for people who want things done right.
Why Stainless Steel 304G?
You see "304G" on hardware and wonder what it means. It is not just a fancy number. It tells you exactly what the metal is made of.
Normal steel is mostly iron. Iron loves water. Give it moisture and it starts turning into rust. Little orange spots at first. Then bigger patches. Eventually the metal just crumbles away.
304 stainless steel fixes this by adding two things.
Chromium goes first. About 18 percent. This creates a shield on the surface. Water cannot get through to the iron. And if something scratches that shield, it fixes itself. The chromium reacts with air and builds the protection right back.
Nickel goes in next. About 8 percent. This makes the metal stronger and gives it that clean look people like for modern doors.
When CROWN ISI makes their SS Towerbolt 304G, they stick to this recipe. No cutting corners. No cheap substitutes. You get real 304 grade material.
The ISI Certification Requirement
Here is something important you need to know.
The government of India made a new rule. From October 2023, all door fittings sold in India must have ISI certification . This includes tower bolts, handles, hinges, and other hardware.
For stainless steel tower bolts, the standard is IS 15833:2009 . This standard covers:
- What raw material to use
- Dimensions and how accurate they must be
- How smooth the finish should be
- How well it resists corrosion
For mild steel tower bolts, the standard is IS 204 Part 1 .
What does this mean for you? It means when you buy SS Towerbolt ISI certified products, you know they meet government quality standards. They are not cheap junk that will fail in a year. They are legal to sell and safe to use.
CROWN ISI SS Towerbolt 304G meets all these requirements. You get the ISI mark. You get the quality. You get peace of mind.
Safety Features Of Modern Tower Bolts
Modern doors need modern safety features. Here is what good tower bolts offer today.
Smooth Action
A good tower bolt slides smooth. You do not have to force it. You do not have to wiggle it. Just push and it moves. Pull and it comes back.
This matters for safety. If you need to get out fast, you do not want a stuck bolt. You want it to slide open instantly.
CROWN ISI SS Towerbolt 304G slides smooth right from the start. And it stays smooth because rust never builds up to make it stick.
Proper Length
The bolt needs to be long enough to go deep into the catch plate. A short bolt can pull out if someone forces the door. A long bolt stays locked tight.
Standard tower bolts come in sizes from 100mm to 300mm . For main doors, go with 200mm or longer. That gives you real security.
Corrosion Resistance
Modern homes have bathrooms with steam. They have balconies with rain. They have kitchens with moisture. Cheap bolts rust in these places.
SS Towerbolt 304G does not rust. Ever. The chromium shield protects it. Your bolt keeps working year after year.
Strong Catch Plate
The catch plate matters as much as the bolt. A weak catch plate can break if someone forces the door. A strong one holds.
CROWN ISI makes their catch plates from the same quality stainless steel. Thick enough to be strong. Built to last.
Where To Use SS Towerbolt ISI Hardware
SS Towerbolt 304G works in many places around your home.
Main Doors
Your front door needs good security. Use a 200mm or 250mm tower bolt on the inside. Slide it at night for extra safety.
Bathroom Doors
Bathrooms have moisture. Stainless steel handles it perfectly. No rust. No sticking. Just smooth action every time.
Balcony Doors
Balcony doors face the weather. Rain, sun, humidity. SS Towerbolt 304G takes it all. No problems.
Garden Gates
Outside gates take the worst weather. Stainless steel is the only choice here. Mild steel rusts in one monsoon. Stainless lasts for decades.
Almirahs And Cupboards
For storing valuables, use smaller tower bolts. 100mm or 150mm works well. Keeps things secure.
What Makes CROWN ISI Tower Bolts Different
You can buy tower bolts anywhere. Local shops. Online. Big hardware stores. So why pick CROWN ISI?
Real 304 Stainless Steel
Not some cheap mix that looks like stainless but rusts anyway. The chromium is there. The nickel is there. Your SS Towerbolt 304G will not rust.
ISI Certified
Meets IS 15833:2009 standard . Government approved. Quality guaranteed.
Smooth Finish
Run your finger along a CROWN ISI tower bolt. Smooth. No rough spots. No sharp edges. They take the time to finish the product properly.
That smooth surface also means the bolt slides easy. No sticking. No forcing it.
Right Thickness
For sizes up to 125mm, the bolt is 10mm thick. For 150mm and above, it goes to 12mm . This gives you more strength where you need it.
CROWN ISI SS Towerbolt 304G follows these standards. You get the right thickness for the size.
How To Install A Tower Bolt On Modern Doors
Installing a tower bolt is easy. Here is how.
Tools You Need
Screwdriver. Drill with correct size bit. Pencil for marking. Measuring tape.
Steps
First, decide where you want the bolt. Usually mid-height on the door is good. For main doors, some people put one at the top and one at the bottom for extra security.
Hold the barrel on the door where you want it. Mark the screw holes. Drill pilot holes so you do not split the wood. Screw the barrel in place.
Close the door. Slide the bolt out so it touches the frame. Mark where the catch plate goes. Make sure the bolt lines up perfectly.
Screw the catch plate in place. Test it. Slide the bolt in and out. It should move smooth and go all the way into the catch plate.
That is it. Ten minute job. Your door is now secure.
Taking Care Of Your Tower Bolts
Stainless steel needs very little care. But a tiny bit of attention keeps things working smooth.
Wipe the bolt with a damp cloth every few months. Just to get dust off. If the slide feels sticky, put one tiny drop of oil on the bolt. Work it back and forth a few times. Good as new.
Check the screws once in a while. They can work loose over time. Give them a turn with a screwdriver to tighten them up.
That is it. Two minutes once a year keeps everything working.
Frequently Asked Questions
Here are the things people usually want to know about SS Towerbolt 304G and SS Towerbolt ISI from CROWN ISI.
1. What is the difference between SS Towerbolt 304G and regular steel?
Regular steel rusts. SS Towerbolt 304G has chromium and nickel that stop rust. The stainless lasts for decades. Regular steel fails in a few years.
2. Is ISI certification mandatory for tower bolts?
Yes. From October 2023, all door fittings sold in India must have ISI certification . CROWN ISI SS Towerbolt ISI meets this requirement.
3. What is the standard for stainless steel tower bolts?
IS 15833:2009 is the Indian Standard for stainless steel tower bolts . It covers material, dimensions, finish, and corrosion resistance.
4. What sizes are available from CROWN ISI?
Common sizes are 100mm, 150mm, 200mm, 250mm, and 300mm . Pick the size that matches your door.
5. What diameter bolt do I need?
For sizes up to 125mm, the bolt is 10mm. For 150mm and above, it goes to 12mm . This gives you the right strength.
6. Can I use these on an outside gate?
Yes. SS Towerbolt 304G is perfect for outside. Rain and sun do not hurt stainless steel. No rust, no problems.
7. Will these rust in a bathroom?
No. Bathrooms have moisture that kills regular steel. Stainless steel handles it fine. Your bolt will keep working.
8. How do I install a tower bolt?
Screw the barrel on your door. Screw the catch plate on the frame. Make sure they line up so the bolt slides in smooth. Easy DIY job.
9. Do CROWN ISI tower bolts come with screws?
Yes. They come with matching screws. Use stainless steel screws so everything matches and lasts.
10. What is the warranty on these?
CROWN ISI stands behind their products. Ask your dealer about specific warranty terms.
11. Can I use these on metal doors?
Yes. For metal doors, you may need to drill and tap holes or use self-tapping screws. Works fine.
12. Why chooseCROWN ISI over cheaper options?
Because cheaper options fail. They rust. They stick. They look ugly. Then you buy new ones anyway. CROWN ISI SS Towerbolt 304G lasts for decades. Buy once and forget about them.
Final Thoughts
Safety hardware is not something to cut corners on. Your doors protect you and your family. The locks on them need to work every single time.
Tower bolts seem like a small thing. But they do an important job. They keep your doors closed. They keep your home secure. They work every day without you thinking about them.
When you buy cheap hardware, you save a few rupees now. But you pay later in rust, stuck bolts, and replacement costs. Plus with the new ISI rules, you might even be buying something that is not legal to sell.
CROWN ISI makes SS Towerbolt 304G for people who want to do things right the first time. Real 304 stainless steel. ISI certified. Smooth action. Made to last.
So next time you need tower bolts, look for CROWN ISI. Ask for SS Towerbolt ISI certified. Get the right size for your door. Spend a little more now and save yourself a lot of headache later.
Your doors will thank you. Every time you slide that bolt, you will feel the difference.
