General Product Line
Structural Bolts
Structural Bolts serve two main purposes: Connecting and securing parts in place on a steel-to-steel connection basis.
Structural Bolts are generally utilized as connectors to join together different steel sections of a project and are not intended for general applications.
Typically very short in length, these bolts help to secure the parts in place to ensure that they create a safe environment. To properly secure a part of a structure with the bolts, it is important to note how “snug” or tight the fit (torque) needs to be. Screwing the bolt in too much or too little could both have negative effects.
Nuts
Here at Centennial, you will find everything you need, including a variety of different types of fastener nuts. Though seemingly small pieces of hardware, nuts are some of the most important, as they keep bolts securely in place. The following are some of the types of nuts that are available:
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Acorn Caps – These are specifically used for both safety and appearance. For safety reasons, an acorn cap can be used to prevent the end of a bolt from cutting someone or something. For appearance, they make the finished project look neater without having the bolt hanging out.
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Castles – These nuts are typically used for applications that are low-torque and are used as positive locking devices.
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Locks – These include other types of hardware such as castles, and are great for locking a bolt in place. While there are different varieties available, all locks play an important role in keeping the bolt secure.
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Square – Some applications call for a nut that is shaped a little differently. Square hardware is often used to avoid the sharp edges that appear on other nut types.
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Coupling Nuts -- Internally threaded fasteners used to connect two externally threaded rods. Essentially, this simple piece of hardware acts as a revolutionary bolt extension for those times when you need a little more room.
Washers
There are various types of washers available, each designed for specific purposes. Below, you will find a summary of ten distinct washer types.
Different Varieties Washers can vary in shape, size, material, or design, such as:
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Belleville washer: This washer has a slightly conical shape, allowing it to function as a spring.
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Bevel washer: This washer is angled, making it ideal for use at an incline.
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Bridge washer: This sturdy, oversized washer is suitable for use in wooden construction.
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Cup washer: This washer has a recessed center that allows the bolt to sit flush.
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Finishing washer: This washer is designed to create a smooth, polished finish for your project.
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Flat washer: These versatile washers are the most commonly used type.
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Lock washer: With teeth that prevent slipping or rotation, a lock washer is an excellent choice.
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Neoprene washer: When a tight seal is required, a neoprene washer can provide a better grip than a metal washer.
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Plate washer: A square washer provides a larger surface area for bearing than a round washer.
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Torque washer: This washer has prongs on the underside to prevent slipping or rotation.
Rods & Studs
There are a lot of different types of rods & studs to choose from for all kinds of projects. You can get studs that are completely threaded, allowing to pass through something and securing with nuts on either side. Single end studs and double end studs are both perfect for anchoring. They have one end for driving into a material and another for screwing a nut in place. To secure your stud or rod, put it in place and then thread a washer (if needed) and a nut onto it.
Socket Head Cap Screws
What Is a Socket Head Cap Screw?
A socket head cap screw serves the same general purpose as a regular screw, but it is shaped differently and is designed specifically for very demanding applications. This type of screw has a hexagonal drive hole and a cylindrical head. It is a tension fastener of high strength that is often used in clamping assemblies and is designed to be very durable and reliable. Socket Head Cap Screws (SHCS) are high-strength, precision fasteners used in a variety of industrial, mechanical, and construction applications.
A ViewTite® from TurnaSure is an advanced type of Direct Tension Indicator (DTI) washer, also known as a visual self-indicating washer or load-indicating washer.
TurnaSure is a company that specializes in manufacturing DTIs and related bolting technologies for structural steel connections. Their ViewTite® is a patented, innovative product (introduced around 2019 and with patents like U.S. Patent No. 10,738,817 B2) designed to make it much easier and more reliable to achieve and verify the correct tension in high-strength bolts.
Benefits include:
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It's a nut-side self-indicator DTI washer compliant with ASTM F959 standards.
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Traditional DTIs use compressible protrusions (bumps) on the washer that flatten under tension to indicate proper load/clamp force.
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ViewTite® goes further with a dye-emitting or visual self-indicating mechanism: When the bolt reaches the required tension, a brightly colored elastomer (neon green) is extruded or becomes visible through gaps or indicators.
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This provides an immediate, obvious visual confirmation — e.g., "when you see green, you know it's correctly tensioned."
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It works on the nut side of the connection (hence "nut-side self-indicator"), making inspection faster and simpler, even in poor lighting.
Anchor Bolts
Anchor bolts are used to secure structures or equipment to concrete or masonry surfaces, providing a strong, stable connection. They transfer loads, resist uplift, shear, or tension forces, and ensure stability in various applications.
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Attaching structural elements: Fastening steel columns, beams, or plates to concrete foundations in buildings, bridges, or towers.
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Mounting equipment: Securing heavy machinery, such as generators or industrial presses, to concrete floors to prevent movement or vibration.
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Supporting infrastructure: Anchoring guardrails, signposts, or light poles to concrete bases for stability against wind or impact.
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Seismic and wind resistance: Providing additional strength to structures in earthquake-prone or high-wind areas by connecting them firmly to foundations.
They typically consist of a threaded end embedded in concrete and a protruding end for attaching nuts or plates, with designs like L-shaped, J-shaped, or straight bolts depending on the load and application.
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For over 90 years, Lindapter® has pioneered the design and manufacture of Structural Steel Clamping Systems and HSS Blind Fasteners, enabling faster steel construction. Products include the Hollo-Bolt, the HSS expansion bolt approved by ICC-ES for all Seismic Design Categories (A through F); while the Girder Clamp is approved for quickly connecting W & S beams. Lindapter® connections eliminate the need for time-consuming drilling or welding in the field and reduce time and labor costs.
U Bolts
The U Bolt may be made from galvanized steel, bright zinc plated steel, or stainless steel. These fasteners are shaped like the letter U, with a pair of threaded arms that extend from the rounded base. The threaded ends are designed for use with screws and washers. In some cases, a crosspiece may be used to increase the security provided by the bolt. Just like other bolts, these fasteners are inserted into holes that have been pre-drilled.
The Right Fit for Many Applications
U bolts are about as versatile as they are strong, and they come in a large variety of sizes. Some of their most practical uses include:
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Attaching items to poles, such as a utility pole
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Securing wiring and cables to walls
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Adding bolts to concrete surfaces (the rounded ends are sunk into wet concrete, with the threaded ends protruding from the surface)
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Supporting pipework
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Attaching signs to posts
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Any general clamping
Drill Bits (DeWALT®)
Fastener drill bits are drill bits specifically designed to create holes for installing fasteners such as screws, bolts, or anchors. They help ensure the fastener fits correctly, holds securely, and doesn’t damage the material.
Here are the most common types used in construction and fabrication:
1. Pilot Drill Bits
A pilot hole is a small hole drilled before inserting a screw or bolt.
2. Tap Drill Bits
These are used when you plan to tap threads into a hole for machine screws or bolts.
3. Countersink Bits
These create a conical recess so the screw head sits flush with or below the surface.
4. Counterbore Bits
Similar to countersinking but creates a flat-bottom recess for bolts or socket head cap screws.
5. Self-Drilling Fastener Bits
Used with self-drilling screws (Tek screws) that drill and fasten in one step.
