21 Feb, 2026 Let me tell you about something that sits on your doors and gates quietly doing its job. A small thing. But it matters more than you think.
A tower bolt.
You slide it closed at night. You open it in the morning. Simple. Reliable. Keeps your doors shut and your home safe.
But here is the thing. Tower bolts come in different materials. Steel. Stainless steel. Brass. Each has its own strengths. Each works best in certain places.
Today we are talking about Brass Tower Bolts ISI certified hardware from CROWN ISI. Why brass? What standards apply? How do they compare to SS Towerbolt 304G? And how do you pick the right one? Let us get into it.
What Is A Tower Bolt?
First, let us make sure we are on the same page.
A tower bolt is a simple sliding lock. 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. Works for decades if made right.
People use them on main doors, bedroom doors, windows, almirahs, cupboards, and gates . Everywhere you need a simple, strong lock.
Why Choose Brass Tower Bolts?
Brass is different from steel. Here is why you might choose Brass Tower Bolts ISI for your home.
Corrosion Resistance
Brass does not rust. Ever. It is a non-ferrous metal, meaning it has no iron in it . No iron means no rust. This makes brass perfect for bathrooms, coastal homes, or anywhere with moisture.
Stainless steel also resists rust. That is SS Towerbolt 304G. But brass has been used for centuries in ships and boats because salt water does not hurt it .
Looks
Brass looks beautiful. It has a warm, golden color that people love. It looks rich and traditional. Many people choose brass for antique or vintage style homes .
Brass also ages well. Some people like the patina that develops over time. Others polish it to keep it shiny. Either way, it looks good for decades.
Strength
Brass is strong enough for normal use. A door bolt gets used thousands of times. Brass handles this just fine. It is not as hard as steel, but it does not need to be. For home use, brass is plenty strong.
Smooth Action
Brass has natural lubricity. That means it slides smooth without sticking. A Brass Tower Bolt ISI feels nice in your hand. It moves easy. No forcing it.
ISI Standards For Brass Tower Bolts
Here is something important you need to know.
The government of India has standards for everything. Tower bolts are no exception. For non-ferrous metals like brass, the standard is IS 204 (Part 2):1992 .
This standard covers:
- Material composition
- Dimensions and tolerances
- Surface finish
- Corrosion resistance
- Testing methods
What The Standard Says
The standard specifies different types of tower bolts. Barrel tower bolts. Skeleton tower bolts. Each has its own dimensions .
For sizes up to 125mm, the bolt diameter must be 10mm. For sizes 150mm and above, the bolt diameter must be 12mm .
The standard also covers finishes. Bright finish. Stain finish. Nickel-chromium plated as per IS 1068. Copper oxidized as per IS 1376. Zinc plated as per IS 1573 .
Why ISI Certification Matters Now
The government made a new rule. From October 2023, all door fittings sold in India must have ISI certification . This includes tower bolts.
The Ministry of Commerce and Industry issued the Bolts, Nuts, and Fasteners Quality Control Order, 2023 . Under this order, BIS certification is mandatory .
Non-compliance can lead to penalties under the Bureau of Indian Standards Act, 2016 .
What does this mean for you? It means when you buy Brass Tower Bolts 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 Brass Tower Bolts ISI meet all these requirements. You get the ISI mark. You get the quality. You get peace of mind.
Brass vs Stainless Steel: Which To Choose?
Both brass and stainless steel are good. But they are different. Here is how to decide.
Brass Tower Bolts ISI
Choose brass when:
- You want that warm, golden look
- You have a traditional or antique style home
- You are in a coastal area with salt air
- You want something that never rusts
- You like how brass ages and develops patina
Brass costs more than mild steel but less than some premium stainless options.
SS Towerbolt 304G
Choose stainless steel when:
- You want a modern, silver look
- You need maximum strength
- You are doing industrial or commercial projects
- You want something that never needs polishing
- You prefer low maintenance
SS Towerbolt 304G is also rust proof. It has chromium and nickel that protect it. It is very strong. And it stays looking the same forever with no work.
Both are good. Which one you pick depends on your style and needs.
CROWN ISI makes both. Brass Tower Bolts ISI for traditional homes and coastal areas. SS Towerbolt 304G for modern homes and heavy duty use.
Common Sizes For Brass Tower Bolts
Brass Tower Bolts ISI come in standard sizes.
- 100mm (4 inch) - Good for windows and small cabinets
- 150mm (6 inch) - Good for bedroom and bathroom doors
- 200mm (8 inch) - Standard size for most doors
- 250mm (10 inch) - For main doors and heavy gates
- 300mm (12 inch) - For very heavy doors and commercial use
The bolt diameter changes with size. Up to 125mm, it is 10mm. From 150mm upward, it is 12mm . This gives you more strength where you need it.
Where To Use Brass Tower Bolts
Brass Tower Bolts ISI work well in many places.
Homes
Bedroom doors. Bathroom doors. Main doors. Windows. Cupboards. Almirahs. Anywhere you need a simple lock.
Brass is especially good in bathrooms. Moisture does not hurt it. No rust. No problems.
Coastal Homes
If you live near the ocean, brass is your friend. Salt air kills regular steel fast. Stainless steel handles it. Brass handles it too. Both are good choices .
Heritage And Restoration Projects
Old homes often had brass hardware. If you are restoring a heritage property, Brass Tower Bolts ISI are the right choice. They look authentic. They match the period.
Decorative Uses
Brass looks good. Some people use it even where they do not need a lock, just for the look. Brass handles and bolts add warmth to a room .
What Makes CROWN ISI Brass Tower Bolts Different
You can buy brass tower bolts from many places. So why choose CROWN ISI?
Real Brass
We use real brass. Not cheap metal with a brass coating. Real brass throughout. That means it lasts. It looks good. It does not rust.
ISI Certified
Our Brass Tower Bolts ISI meet IS 204 (Part 2):1992 standard . Government approved. Quality guaranteed.
Correct Dimensions
The bolt diameter is right. 10mm for small sizes. 12mm for large sizes . The holes line up. The bolt slides smooth. No frustration during installation.
Smooth Action
Brass naturally slides smooth. But we also finish our bolts properly. No rough spots. No sticking. Just smooth operation every time.
Range Of Sizes
We make all standard sizes. From 100mm to 300mm. You can find the right size for your door.
How To Install A Brass Tower Bolt
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 Brass Tower Bolts
Brass needs a little care to look its best.
If You Want It Shiny
Polish it now and then with brass polish. Available at any hardware store. A quick polish brings back the shine.
If You Like The Aged Look
Leave it alone. Brass develops a natural patina over time. Some people love this look. It gives character.
Either Way, It Works
The lock works whether shiny or aged. The mechanism does not care about looks. It just keeps sliding smooth.
For the mechanism itself, a tiny drop of oil every few years keeps it moving nice. That is all.
Frequently Asked Questions
Here are the things people usually want to know about Brass Tower Bolts ISI and SS Towerbolt 304G from CROWN ISI.
1. What is the difference between brass and stainless steel tower bolts?
Brass has a warm gold color and develops patina over time. Stainless steel is silver and stays the same. Both resist rust. Brass is traditional. Stainless is modern. Both are good.
2. What is the ISI standard for brass tower bolts?
IS 204 (Part 2):1992 is the Indian Standard for non-ferrous metal tower bolts like brass .
3. Is ISI certification mandatory for tower bolts?
Yes. From October 2023, all door fittings sold in India must have ISI certification .
4. What sizes are available in Brass Tower Bolts ISI?
Standard sizes are 100mm, 150mm, 200mm, 250mm, and 300mm .
5. What diameter bolt do I need?
For sizes up to 125mm, the bolt is 10mm. For 150mm and above, it is 12mm .
6. Can I use brass tower bolts in a bathroom?
Yes. Brass does not rust. It is perfect for bathrooms and other moist areas .
7. Can I use them on an outside gate?
Yes. Brass handles outdoor weather well. It resists corrosion from rain and sun .
8. How do brass and SS Towerbolt 304G compare for coastal use?
Both are good. Brass has been used on ships for centuries. SS Towerbolt 304G is also marine grade. Either works fine near the ocean.
9. Do CROWN ISI brass tower bolts come with screws?
Yes. They come with matching mounting hardware. Use the screws provided for best results.
10. How do I clean and maintain brass tower bolts?
For shine, polish with brass polish. For aged look, leave it alone. Either way, the bolt works fine.
11. What is the warranty on CROWN ISI brass tower bolts?
CROWN ISI stands behind their products. Ask your dealer about specific warranty terms.
12. Why choose CROWN ISI over other brands?
Real brass. ISI certified. Correct dimensions. Smooth action. Range of sizes. Almost 50 years of experience. Quality you can trust.
Final Thoughts
Tower bolts are small things. 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.
Brass is a beautiful material for tower bolts. It looks rich. It never rusts. It lasts for generations. And with ISI certification now mandatory, you know you are getting real quality.
CROWN ISI makes Brass Tower Bolts ISI for people who want the best. Real brass. Correct dimensions. Smooth action. Made to last.
We also make SS Towerbolt 304G for those who prefer stainless steel. Both are excellent. Which one you choose depends on your style and needs.
So next time you need tower bolts, look for CROWN ISI. Ask for Brass Tower Bolts ISI or SS Towerbolt 304G. Get the right size for your door. Spend a little more now on quality hardware. Save yourself a lot of headache later.
Your doors will thank you. Every time you slide that bolt, you will feel the difference.
