Fasteners come in a wide range of shapes, sizes, and finishes, and each type serves a variety of purposes. Whether you're working on a construction project or assembling machinery, choosing the right fastener is key to ensuring durability and performance. To help guide you through the sometimes confusing world of specialty fasteners, we’ve compiled a list of frequently asked questions from buyers.
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**1. What’s the Difference Between a Bolt and a Screw?**
This is a common query since people often use these terms interchangeably. Bolts are generally meant to be used with a nut to join two components, while screws are designed to be inserted into a pre-drilled hole and cut their own threads. However, a screw can function as a bolt when used with a nut, whereas a bolt isn’t always suited to act as a screw. The main distinction lies in their design specifications and intended uses.
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**2. What Are the Most Common Fastener Materials and Finishes?**
Fasteners are commonly made from materials like steel, stainless steel, and aluminum, each offering different levels of strength and corrosion resistance. They also come in various finishes, such as zinc plating, hot-dip galvanizing, and PTFE coatings, which add extra layers of protection against rust and wear.
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**3. What’s the Difference Between Coarse and Fine Threads?**
Thread series play a significant role in a fastener’s performance. Coarse threads (UNC) have fewer threads per inch compared to fine threads (UNF), making them ideal for quick assembly jobs because they resist damage and work well with thicker coatings. On the other hand, fine threads are favored in applications requiring high strength and resistance to vibrations, such as automotive parts and machinery.
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**4. What Are Mechanical Anchors, and When Should You Use Them?**
Mechanical anchors are used to attach materials to concrete or masonry structures. There are several types, including wedge anchors, sleeve anchors, masonry screws, and more. Each type serves specific purposes, so it’s important to know their unique features. For instance, drop-in anchors need a special tool for installation.
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**5. Why Are Grade Markings Important on Fasteners?**
Grade markings indicate the tensile strength of a fastener. For example, SAE Grade 5 fasteners feature three radial lines on the head, while Grade 8 fasteners have six. In the metric system, property classes like 8.8, 10.9, and 12.9 directly correspond to the tensile strength in megapascals (MPa).
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**6. Which Nut Should Be Used With a Specific Bolt?**
Selecting the appropriate nut for a bolt is critical for securing connections effectively. Different nut grades are designed to match specific bolt grades. For example, ASTM A193 Grade B7 studs should always pair with A194 Grade 2H heavy hex nuts.
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**7. How Do You Determine the Right Length for an All-Thread Stud?**
The length of an all-thread stud can be measured in two ways: overall length or first thread to first thread. Continuous thread studs are measured from end to end, including the chamfer, whereas flange-type studs are measured from the first fully formed thread to the next-to-last fully formed thread, excluding the chamfer.
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**8. What Are Rivnuts, and How Are They Used?**
Rivnuts, also called rivet nuts, are threaded inserts installed in thin materials to create a robust threaded connection point. They’re particularly useful when access is limited to one side of the material, such as in truck trailer panels.
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**9. What Is a Structural Bolt?**
Structural bolts are heavy hex bolts with a full body diameter and shorter thread lengths than standard hex bolts. They’re often used in structural applications where reliability and strength are essential.
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**10. What Is an Anchor Bolt?**
Anchor bolts are used to secure steel structures to concrete. One end is embedded in the concrete, while the other end remains exposed and threaded. Common anchor bolt grades include 35, 55, and 105.
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**Big Bolt Has Big Inventory**
Are you planning a project but unsure about the type or quality of fasteners needed? Look no further! At Big Bolt, we can either manufacture custom fasteners or provide you with options from our extensive stock. If your project requires urgent delivery or unique customization, we’re here to help. Reach out today for a quote!
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As a trusted provider in the fastener industry, we pride ourselves on offering top-tier service and products tailored to your needs. Don’t hesitate to contact us—we’re ready to assist you every step of the way!
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