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Anchor bolts are essential fasteners used to attach structures or equipment to concrete. They provide secure and stable support in applications ranging from buildings and bridges to machinery and pipelines. With varying designs, shapes, and materials, different types of anchor bolts serve different structural and industrial purposes.
At Neelkamal Fasteners LLP, we manufacture and supply a wide variety of high-quality anchor bolts used across construction, power plants, railways, petrochemicals, and infrastructure projects. In this guide, we’ll cover the 10 most common types of anchor bolts, their characteristics, and their typical applications.
1. L-Type Anchor Bolt
L-shaped anchor bolts are bent at a 90-degree angle at one end. This bend helps the bolt resist pull-out from the concrete once set.
- Material: Mild steel, stainless steel, or high-tensile steel
- Applications: Columns, structural supports, heavy equipment foundations
- Features: Strong holding power; economical; commonly available
2. J-Type Anchor Bolt
Similar to the L-type, J-bolts are bent into a “J” shape, providing better grip within the concrete. The curve prevents the bolt from loosening under load.
- Material: Carbon steel, alloy steel
- Applications: Poles, towers, light structures, substation foundations
- Features: Easy to install; cost-effective
3. U-Type Anchor Bolt
U-bolts are shaped like the letter “U” with two threaded legs. They are used to attach round objects like pipes or tubing to concrete or steel.
- Material: Galvanized steel, stainless steel
- Applications: Pipe supports, clamps, marine equipment
- Features: Securely wraps around cylindrical items; good for vibration-prone areas
4. Sleeve Anchor Bolt
Sleeve anchors consist of a threaded bolt inside a cylindrical sleeve. When tightened, the sleeve expands to anchor the bolt in place.
- Material: Stainless steel, zinc-plated steel
- Applications: Brick, block, and concrete fastening
- Features: Quick installation; no need for pre-embedding
5. Wedge Anchor Bolt
A wedge anchor expands and wedges itself into the drilled hole in concrete when the bolt is tightened, offering high pull-out resistance.
- Material: Steel, stainless steel
- Applications: Industrial machinery, racking systems, heavy-duty structural work
- Features: Excellent holding strength; reliable under heavy load
6. Expansion Anchor Bolt
Expansion bolts work on the principle of mechanical expansion. Tightening the nut pulls a cone into the sleeve, expanding it against the concrete wall.
- Material: Stainless steel, hot-dip galvanized
- Applications: Guard rails, sign boards, structural steel fixing
- Features: High load capacity; vibration-resistant
7. Eye Bolt Anchor
Eye bolts have a looped head and are used as lifting or tie-down points in concrete. They can be cast-in or post-installed.
- Material: Carbon steel, forged steel
- Applications: Lifting systems, cable terminations, safety restraints
- Features: Ideal for hoisting or rigging; corrosion-resistant finishes available
8. Hook Anchor Bolt
Hook bolts feature a curved or open-ended hook on one side. These are commonly embedded into concrete to hang heavy objects or structural components.
- Material: Stainless steel, mild steel
- Applications: Pipe hangers, support rods, construction beams
- Features: Easy to attach and remove items; suitable for overhead suspension
9. Cast-In Anchor Bolt
Cast-in-place anchor bolts are placed in the concrete formwork before pouring. Once the concrete cures, the bolt becomes a permanent part of the foundation.
- Material: High-tensile or mild steel
- Applications: Foundations of buildings, chimneys, turbines
- Features: Strong and permanent; custom configurations available
10. Chemical Anchor Bolt
Chemical anchors involve placing a resin (epoxy or polyester) into a drilled hole, followed by insertion of the anchor bolt. The resin hardens to create a high-strength bond.
- Material: Stainless steel, threaded rods
- Applications: High-stress and seismic areas, load-bearing structures
- Features: No expansion stress; excellent for cracked concrete
Why Choose Neelkamal Fasteners LLP for Anchor Bolts?
At Neelkamal Fasteners LLP, we ensure each anchor bolt meets stringent industry standards with:
- Customization options in thread size, length, and bend configuration
- Raw material traceability and material test certificates
- Surface finishes such as hot-dip galvanized, zinc plated, and PTFE coated
- Packaging and export support for bulk international orders
- Compliance with standards: ASTM, IS, DIN, BS, and ISO
We serve clients across construction, infrastructure, oil & gas, transmission line towers, and more.
Conclusion
Understanding the 10 types of anchor bolts allows engineers, fabricators, and contractors to select the right fastening solution for their application. Whether it’s an L-type for foundation bolts or a chemical anchor for seismic zones, each type offers unique benefits.
Trust Neelkamal Fasteners LLP for reliable, precision-manufactured anchor bolts that ensure strength, stability, and performance in your most demanding projects.
