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What is a Grade 8 fastener?
How do I know if a fastener is graded?
What is a Grade 8 bolt?
What are the different grades of fasteners?
Inch fasteners—those commonly used in North America—will have a grade or ASTM rating. Property class (often just "class") specifies metric fasteners. Special markings on screw heads and nuts identify the fastener's grade. Replace a graded fastener with same or higher grade (don't replace a Grade 8 fastener with a Grade 5 or 2).
Aug 2, 2023 · What Is a Grade 8 Bolt? A Grade 8 bolt is a type of high-strength fastener that’s named after its SAE (Society of Automotive Engineers) grade classification, which is based on its mechanical properties. Hence, “Grade 8” is short for “SAE J429 Grade 8.”
- Why Do Nuts and Bolts Have Markings?
- Common Markings on Nuts and Bolts
- SAE vs. Metric Markings
- Screw Markings
- Wedge Anchor Markings
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When shopping for nuts and bolts, you may have noticed the fastener's head has markings engraved. These markings have a specific purpose that will help you understand the fastener more in-depth. The markings are an indication of the fastener's make, material, and dimension. The tool manufacturer engraves these markers as a helpful way for customers...
When it comes to nuts and bolts, there are many markings that you may come across. Common markers include letters, numbers, dashes, slashes, dots, and many more. Many nuts and bolts follow SAE or Metric standards ensuring strength and reliability.
SAE Bolt Head Markings
The Society of Automotive Engineers created a system of grades to identify valuable information about the fastener. The grades of a fastener can represent what material it is made out of, its hardness range, and its strength characteristics. SAE grades use the imperial measurement system. The imperial measurement system uses inches. The SAE J429 standard has specific requirements for bolts, screws, studs, sems, and U-bolts up to 1-1/2" in diameter. Bolts meeting SAE J429 standards have radial...
Metric Bolt Head Markings
Metric classes are set by the ISO (International Standards Organization). Metric markings combine two numbers separated by a dot. The number markings are engraved on the top or side of the bolt head. Common metric classes are 5.8, 8.8, 10.9, and 12.9. The higher the numbers are, the stronger the material of the fastener is. The number that appears before the decimal, when multiplied by 100, will provide the approximate minimum tensile strength of the bolt. The number after the decimal, when m...
Tensile Strength
Before using any fastener, being aware of its tensile strength, proof load, and yield strength is crucial so the fastener doesn't break or lose its elasticity during use. Tensile strength is the amount of stress or load that the fastener can withstand by a material before it stretches and breaks. The tensile strength is tested by applying mechanical loads to the fastener. This amount of pressure determines its resilience. Understanding tensile strength is incredibly important when choosing ha...
Many screws have consistent markings that make it easy to distinguish the size of the screw. Conquest screws, for example, have the length in the decimal form for inches stamped on the head of the screw. Additionally, theConquest concrete screwsinclude a shield symbol stamped on the head of the screw that represents the Conquest brand.
The markings for concrete wedge anchors differ from screws. Conquest wedge anchors, for example, have a letter marked on the head of the anchor. The letter signifies the length of the fastener. Check out thespec sheetfor theConquest wedge anchorsto see what the letters equate to in length sizes. Conquest wedge anchors also have a Conquest shield st...
Fasteners Plus carries a variety ofscrews,connectors,anchors,nails,power tools, and more! Place your orders at FastenersPlus.com and our dedicated team will get quality products sent to you. If you have any questions about fastener options, please do not hesitate to reach out to our Product Experts at (888) 794-1590or by email at customerservice@fa...
Jan 4, 2023 · What does Grade 8 mean in fasteners? In the U.S., a Grade 8 fastener is made of medium carbon alloy steel, quenched and tempered, and has a tensile strength of at least 150,000 psi. These fasteners are designated as Grade 8 because they meet or exceed the minimum tensile strength requirements for.
Nov 21, 2023 · US Bolt Grades Chart with Strength Chart. The most common SAE bolt grades are Grade 2, Grade 5, and Grade 8.
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Aug 20, 2023 · ASTM A574 is stronger than grade 8. ASTM A574 is typically used in applications requiring strength and durability, such as construction and mining equipment. Grade 8 is typically used in high-strength applications, such as fasteners and valves.
Grade 8 bolts are made of alloy steel and have a tensile strength of at least 150,000 PSI. Alloy steel bolts are very strong and are used in demanding applications such as in automobiles and industrial machinery. Three Systems of Bolt Grades. There are three main systems of bolt grades: SAE, ASTM, and ISO. SAE (Society of Automotive Engineers ...
