Structural Nut Bolt
A structural nut bolt is a high-strength fastener used to join heavy steel members like beams, columns, and rafters. City Steel supplies high-tensile structural nut bolt sets that carry the heavy loads of a factory frame without stretching or failing, keeping your building stable for over 20 years. You get certified ASTM A325 or Grade 8.8 bolts with hot-dip galvanized coating to stop rust in humid environments. Every set comes with a matching heavy hex nut and hardened washer to ensure the joint meets international safety standards. These fasteners provide a secure friction connection that prevents the steel plates from moving under wind or crane loads. These fasteners are used for PEB warehouses, industrial sheds, and multi-storey buildings across Bangladesh. Whether you need standard sizes or custom lengths, we provide project-ready supply for your construction site.
Product Description
Structural Nut Bolt for PEB & Steel Buildings - High-Tensile A325 & Grade 8.8
A structural nut bolt is a heavy-duty steel fastener specifically designed for use in structural joints. Unlike standard hardware bolts, these fasteners carry the immense tension and shear loads of a factory or warehouse frame. City Steel provides high-tensile structural nut bolt sets that ensure your building remains stable under wind, crane, and roof loads.
In the Bangladesh steel sector, the safety of a pre-engineered building (PEB) depends on the quality of its connections. We supply high tensile bolt options that meet international safety standards, preventing the risk of joint failure. Whether you are connecting a rafter to a column or securing a base plate, using the correct steel bolt grade is the most important part of your assembly.
City Steel is a leading nut bolt supplier bangladesh, providing tested fasteners to contractors, factory owners, and engineers. We supply these components for industrial projects in Dhaka, Chittagong, and across the country.
Why Choose City Steel Structural Nut Bolt?
Carries Immense Loads with High-Tensile Steel
Structural joints face high pressure. We supply A325 and Grade 8.8 bolts that have high yield strength (up to 640 MPa or more). This means the structural bolt can be tightened to a specific tension, creating a "friction connection" that prevents steel plates from sliding or moving.
Hot-Dip Galvanized Finish Stops Corrosion
Rust is the biggest enemy of steel connections in humid areas like Gazipur or Narayanganj. Our galvanized bolts have a thick zinc coating that blocks moisture and chemicals. This protection ensures the threads do not weaken over time, keeping your structure safe for decades.
Precision Threading for Accurate Torque
A hex bolt is only as good as its threads. City Steel fasteners feature precision-cut or rolled threads that allow for smooth assembly and accurate torque application. This makes on-site erection faster and ensures every joint is tightened to the exact engineer-specified limit.
Meets AISC and ASTM Global Standards
Safety is not a guess. Every structural nut bolt we supply follows ASTM A325 or BS EN standards. This compliance is required for high-rise steel buildings and heavy industrial sheds to ensure the fasteners can handle the calculated stresses of the design.
Available in Bulk for Project-Wide Supply
Large factory sheds require thousands of fasteners. As a structural bolt wholesale dhaka partner, we maintain large stocks of various lengths and diameters. This prevents project delays, as we can deliver the full quantity of nut bolt sets directly to your site.
Technical Specifications: structural nut bolt
| Specification | Details |
| Product Type | High-Tensile Structural Fastener |
| Steel Grade | ASTM A325 / A490 / Grade 8.8 / Grade 10.9 |
| Diameter Range | 12mm to 36mm (M12 to M36) |
| Standard | ASTM, DIN, AISC, MBMA |
| Yield Strength | 240 MPa to 940 MPa (Grade dependent) |
| Finish / Coating | Hot-Dip Galvanized / Black Oxide / Zinc Plated |
| Components | Heavy Hex Bolt, Heavy Hex Nut, Hardened Washer |
| Fabrication | Forged and Heat Treated |
| Thread Type | Coarse (UNC) or Metric |
| Application | PEB Connections, Beams, Columns, Bracing |
The grade of the bolt (such as A325) tells you how much force it can take before stretching. The coating is chosen based on whether the bolt is inside a dry room or exposed to the weather. Nut bolt price per kg bd varies based on the current steel market and the specific grade required.
Is This Structural Nut Bolt Right for Your Project?
A structural nut bolt is the only choice for the primary connections of a steel building. Standard MS bolts are too soft and will snap or stretch under the weight of a factory roof. These fasteners are necessary for:
- Primary PEB Frames: Joining rafter-to-column and rafter-to-rafter.
- Heavy Machinery Platforms: Where vibration resistance is needed.
- Multi-Storey Steel Structures: For high-load floor beam connections.
- Bridge and Tower Construction: Where maximum safety is required.
If you are a contractor in Savar, Chittagong, or Gazipur building a heavy industrial shed, these high-tensile sets are mandatory.
Not ideal for: Light-weight furniture, thin CI sheet fixing, or non-structural decorative work where a standard hex bolt is sufficient.
Fabrication, Delivery & Installation
City Steel Corporation provides a complete supply loop for your project.
- Design Review: We check your structural drawings to ensure the bolt lengths and diameters match the connection plate thickness.
- Factory Supply: Bolts are sourced from certified manufacturers or fabricated as custom anchor bolt manufacturer bangladesh orders in our Savar facility.
- Delivery: We deliver fasteners in heavy-duty bags or crates to your project site nationwide.
- On-Site Installation: Our erection crews use calibrated torque wrenches to ensure every structural nut bolt is tightened to the correct tension.
A practical tip: Always keep your bolts in their original packaging until needed to prevent the galvanized coating from getting scratched or the threads from getting dirty.
Why Order Your Structural Nut Bolt from City Steel Corporation?
City Steel Corporation has supplied steel structures across Bangladesh since 2015, with 150+ projects for clients like Singer Bangladesh, Vintage Garments, and the Bangladesh Army. We understand that a building is only as strong as its smallest bolt.
What you get:
- Free engineering consultation on bolt sizing and grades
- Certified high-tensile steel (ASTM/DIN compliant)
- Direct supply from our Hemayatpur, Savar warehouse
- Nationwide delivery to your project site
- Experienced erection crews who understand proper torque
- Full project supply (Bolts + Nuts + Washers)
- Flexible payment terms and clear VAT-included quotes
Call or WhatsApp our engineers: +880 1711-787556 / +880 1711-991775 (Sat–Thu, 9 AM – 6 PM).
Frequently Asked Questions for structural nut bolt
What is the structural bolt price in Bangladesh?
The structural bolt price in bangladesh is usually calculated by weight (per kg) or by the set (piece). Prices change based on the steel grade (e.g., A325 is more than Grade 8.8) and the coating. For current bulk rates, send us your requirements for a quote.
What is an ASTM A325 bolt?
An A325 bolt is a heavy hex structural bolt used in steel-to-steel connections. It is heat-treated to have high strength and is the standard for most PEB structures in Bangladesh.
How is the nut bolt price per kg bd determined?
The price per kg depends on the cost of raw high-carbon steel and the heat-treatment process. Hot-dip galvanized bolts cost more per kg than black oxide bolts because of the added zinc layer.
Can I use a standard nut with a structural bolt?
No. A structural nut bolt must be used with a matching heavy hex nut of the same grade (e.g., DH nut with A325 bolt). Using a weaker nut will cause the threads to strip during tightening.
Do you serve as an anchor bolt manufacturer bangladesh?
Yes. We manufacture custom anchor bolts at our Savar factory. We can make L-type, J-type, and plate-welded anchor bolts to your specific length and diameter.
What finish should I choose for a warehouse in Chittagong?
For coastal or high-humidity areas like Chittagong, you should always choose hot-dip galvanized bolts. This prevents rust caused by salt air and moisture.
How do I know the bolts are high-tensile?
High-tensile bolts have markings on the head. For example, an A325 bolt will have "A325" stamped on it, and a Grade 8.8 bolt will have "8.8" on the head.
Do you deliver outside of Dhaka?
Yes. We are a nut bolt supplier bangladesh with nationwide delivery. We send project supplies to Comilla, Sylhet, Bogra, and all other industrial zones.
Products That Go With This
- Steel Column: The bolts connect these vertical members to the foundation and rafters.
- Steel Beam: Used to join floor beams to columns in multi-storey buildings.
- Steel Rafter: Structural bolts are used at the ridge and eaves of the roof frame.
Get a Custom Quote for Your Structural Nut Bolt Today
Secure your building with certified, high-strength fasteners. Whether you need A325 bolts for a new factory or custom anchor bolts for a foundation, City Steel provides tested products that meet all structural codes. Don't risk your project with low-grade hardware.
✔ 150+ Projects Completed ✔ Own Factory & Warehouse ✔ Nationwide Delivery
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Call/WhatsApp: +880 1711-787556