Bolt Strength Grades. Steel Bolts - Metric Grades Steel Bolts - SAE Grades For metric b

Steel Bolts - Metric Grades Steel Bolts - SAE Grades For metric bolts strength is according ISO 898 Mechanical properties of fasteners made of carbon steel and alloy steel described by "property classes" with designations 4. It has a tensile strength of around 1000 MPa and a yield strength of 900 MPa. 8 Anchor Bolt in India, Buy Class 8. ISO/Metric Nov 28, 2023 · Gain a solid understanding of bolt weight and strength grades with our comprehensive table. The greater the tensile strength of the bolts, the more torque the bolts can take and tighter the joint can be fixed. Designed for strength and durability. Heat treated in a controlled atmosphere, these bolts can be identified by the three distinct marks located on the bolt head. Discover their applications and how to choose the right one for your project. Manufactured from low-carbon steel and meeting ASTM A307 Grade A specifications, these bolts offer dependable tensile strength for non-critical structural connections. For example, a Grade 8 bolt has a higher tensile strength than a Grade 2 bolt, making it suitable for more demanding applications. Jul 28, 2023 · From SAE to ASTM to ISO, learn all about bolt grades, tensile strengths, and suitable applications. A guide to selecting the perfect bolt for your project. 40 sets (40 bolts plus 40 nuts). Bolt Grades And Markings ISO property classes for steel bolts, screws, studs and nuts The strength of standard ISO metric steel bolts, studs and nuts is readily identified by means of a numerical code. 9 12. Make informed decisions and ensure the success of your mechanical engineering projects. It's always a good practice to use a torque wrench when tightening bolts. 8 bolts are high-strength fasteners defined by ISO 898-1, with a minimum tensile strength of 800 MPa and yield strength of 640 MPa. 8, 8. If strength is important, ensure that both the grade and manufacturer identification markings are present. Tensile strength is the maximum amount of pulling force a material can withstand before it breaks. 8 high tensile metric bolt is equivalent to a grade 5 imperial bolt, and a grade 8 imperial bolt is equivalent to a class 10. Because there are so many different grades and fasteners all look about the same, medium carbon and alloy steel strength grades are marked for identification. 9 vs 10. A chart to identify bolt grades using bolt grade markings; also provides a strength chart for common grade bolts. Jul 1, 2025 · This article will systematically analyze the grades of bolts. Includes printable chart. 9 and 12. 8, 9. Some notes from ISO 898 metric screw threads standards: - Standard specifies Jun 5, 2020 · Learn about high strength bolts, or structural bolts, and how they are used to connect structural members in a variety of industrial applications. May 7, 2025 · In general, no. Expert insights inside! Jun 21, 2023 · The tensile strength of bolts varies depending on their grade or material composition. SAE steel bolts - grades ranging grade 1 to 8. Tensile Strength: The maximum load a bolt can handle without breaking. CNRL bolt grade markings, strength chart, and metric bolt size chart guide distributors in proper fastener selection. The second number is = 1/100. 9, technicla detail regarding the various Bolt Grades covered by ISO898 and DIN267 Oct 1, 2017 · Bolt strength is bolt strength, it's based totally on the material and the cross-section area of the fastener. Feb 27, 2014 · Bolting Property Classes 8. SAE Grade 5 has three lines spaced like a Mercedes logo (at 12, 4, and 8 o'clock), while Grade 8 has six lines evenly spaced around the head. Apr 19, 2022 · Knowing the different grades of bolts and their tensile strength can help you choose the right type for your application. Request a Quote 3 days ago · Looking for high grade steel bolts gotrax traveler? Discover top-rated, verified suppliers with Grade 8. Aug 21, 2025 · Complete fastener grades guide covering SAE Grade 2-9, metric 4. 8 wedge style expansion anchor, Sleeve, Toggle Bolts and L Shaped Anchor Bolts in all sizes and dimensions. In bolting applications, ASTM A563 or ASTM A194 grade heavy-duty nuts should be used with strength levels comparable to or compatible with the high-strength bolts selected (Figure 5). We are totally committed to our merchant distributors and the fastening industry of New Zealand. A properly manufactured high strength bolt maybe be more brittle than its weaker counterpart but the weaker bolt (at least in the case of grade 5 and 8) will both yield AND break before the stronger bolt has begun to yield. It is crucial to use the right kind of bolt per application. They determine the maximum amount of load the bolt can handle as well as the method that can be used for tightening the bolt. Jan 8, 1993 · Eurocode 3 Table of design properties for metric hexagonal bolts M5 to M39 (stress area, shear strength, tensile strength, bearing strength) Description: Torque values for various grades and diameters of fasteners. Download a printable stainless chart (PDF). Bolts are made from different grades of steel and these grades indicate the strength of the bolt and we’re often asked about the different bolt grade strengths available and when they should be used. High-tensile bolt grades refer to bolts designed to withstand heavy loads and extreme conditions. Machined from 12. 9 bolts and studs. 8 10. Always pay close attention to the head of a bolt to ensure it is the right strength bolt. Bolt strength can be divided into ordinary grade and high strength grade. Both grade 5 and grade 8 are available in plain steel and zinc plated steel. Apr 25, 2022 · Grade 8 bolts are designed to deal with heavy loads and high stress, are ideal for structural loads and have a minimum tensile strength of to 150,000 pounds per square inch of pressure. We would like to show you a description here but the site won’t allow us. Apr 4, 2025 · Learn about bolt and nut grades, their importance in projects, and how to select the right fasteners. May 20, 2025 · Discover how bolt grades impact your projects. 9 vs 8. Bolts are responsible for holding together everything from buildings to machinery, and choosing the wrong strength can lead to structural failures, safety hazards, and costly repairs. For bolts, you can find the SAE J429 grade displayed in radial lines on the head, which indicate the grade and strength requirements. 8 bolts are commonly used in structural steel connections subjected to heavy loads and are prevalent in many construction projects. 9 grade steel and cryo-treated for enhanced strength, these bolts are the ultimate in strength designed to withstand the toughest conditions. All specifications shall be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate. On the head of each bolt there are two numbers which are separated by a decimal point. 9, 8. No matter the system used to grade the bolts, the higher the bolt grade number, the stronger the bolt. You'll spot them as raised lines or numbers on the bolt head. No matter the system, the higher the number the greater the strength of the Here, we'll offer more details on different grades of bolts and their applications to help you find the best-suited grade for your projects. A bolt grade refers to the mechanical properties of the bolt—mainly tensile strength, yield strength, and hardness. Learn tensile strength, markings, and applications. Bolt Grade Markings & Strength American Bolts Metric Bolts Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. Bolt Strength Requirements by Grade All specifications are ASTM unless otherwise noted. Click to find reliable options now! Bolt Grade Markings and Strength Chart Print this page Shop for US Bolts Shop for Metric Bolts High Tensile is very strong, long-lasting carbon steel, find here the Difference between Grade 8 and 10. Whether you need Grade 8, Class 12. Learn to choose the right fastener, avoid costly mistakes, and build with confidence. These grades are assigned by standards bodies like SAE (Society of Automotive Engineers) in the U. Specifications — ASTM A563 — Carbon and Alloy Steel Nuts. Hardware Menu Hex Bolt Identification, Markings and Strength Chart Table Guide Hex Bolt Identification, Markings and Strength Chart. 9. Dec 18, 2024 · Learn about the different grades of bolts, including Grade 2, Grade 5, Grade 8, and high-strength alloy bolts. ASTM A194/A194M — Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service. 25-4 inches in size. It is used to select the correct size and type of bolt for specific applications, ensuring that the joint will be strong enough to handle any load it may incur. Explore SAE, ISO, and ASTM standards for safety and performance. I assume the ones marked grade 12. Feb 15, 2019 · You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. Feb 16, 2025 · Structural bolts are high-strength fasteners used to connect steel members in buildings, bridges, and industrial structures. Compare composition, mechanical properties, and strength. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel. Grades of Bolts - Bolt Grade Marking Chart, p2 Grades of Bolts - Bolt Grade Marking Chart, p3 Tensile Strength: The resistance of a material to breaking under tension Yield Strength: The stress at which a speci c amount of deformation is produced Proof Load: An axial tensile load which the product must stand without evidence of any Bolt Grade Markings & Strength American Bolts Metric Bolts Tensile Strength: The maximum load in tension (pulling apart) which a material can withstand before breaking or fracturing. Bolt grades are alphanumeric designations that categorize bolts based on their mechanical properties. A grade 2 bolt made of low-carbon steel has a tensile strength of 64,000 pounds per square inch or less. Q & T - Quenched and Tempered. Mar 3, 2022 · SAE J429 is the standard developed for bolt, screw, stud, sem, and U-bolt specifications. 9 and choose the right strength level for your project with Jingle fasteners. Learn the difference between proof load, yield strength and tensile strength, and how to shop for bolts by grade. Dynamic vs static loads play no part in bolt strength. Nov 14, 2025 · Complete guide to bolt grades. ASTM A307 Grade A: Suitable for bolts, studs and screws for general applications, with a minimum tensile strength of 60 Metric Bolt Grade Markings & Steel Strength Chart (with US Equivalents) This guide explains common metric bolt classes (12. 9 metric bolt. The bolt grade is a measure of the tensile strength of a bolt. 2 - proof and tensile strength. 9, and stainless steel bolts. 9, or stainless steel, this guide covers it all. Property classes for steel bolts, screws and studs The code is comprised of two numbers separated by a dot. Find out the bolt grade markings and strength chart for US and metric bolts. Dec 10, 2022 · What is Bolt Strength Chart? A bolt strength chart is an important tool for calculating the tension or clamp force that a bolted joint can withstand. 8 are used—plus A2-70 and A4-80 stainless. Learn the differences between Grade 5, Grade 8, and Grade 9 bolts - strength specs, markings, applications, and how to choose right. The first number is the tensile strength of the bolt material (N 2 )/100. 8 are “high-strength anchor bolts”? The core difference between a high-strength anchor bolt and a normal bolt is not the strength of the material used, but form of force. Carriage bolts A307 Grade A Zinc are general-purpose fasteners designed for reliable performance in wood-to-wood, wood-to-metal, and light structural applications. Grade 10. English bolts are categorized by grade and metric by strength class. Discover the differences between US and metric grades, their applications, and how to choose the right fasteners for your project. OEM Supply (NZ) Ltd supplies High Tensile, Bolts, Nuts, Washers, Flange Bolts, 12 Point Bolts, Grade 9 Bolts, in New Zealand and overseas. 8 strength, zinc plating, and fast shipping. Unknown to most, a class 8. Manufacturer and supplier of Grade 8. The common metric bolt grades/classes are 4. There exists an often quoted myth, that Grade 5 bolts are better in shear than Grade 8 since they will bend before breaking. 8, 10. 6, 4. Dec 19, 2022 · Bolt grades refer to the strength of the steel and are important considerations when selecting fasteners for your application, whilst the coating can provide extra protection, especially against corrosion. Information on the strength requirements of the different grades of construction fasteners. AFT Technical Resources. They provide strong, reliable, and durable connections in structural steelwork, ensuring safety and stability under various loading conditions. Sep 28, 2024 · Learn about the different grades of bolts and nuts, including Grade 2, Grade 5, Grade 8, stainless steel 304, 316, and alloy steel grades. Hardnesses are Brinell Hardness Numbers. . Understand bolt grades from SAE 2 to ISO 12. By World Material ASTM A307 Bolts, Threaded Rod, Grade A, B ASTM A307 bolts, threaded rod and studs, are the most commonly used fasteners, covering two grades of chemical and mechanical requirements from 0. Steel Bolts - SAE Grades SAE steel bolts - grades ranging grade 1 to 8. Aug 2, 2023 · How strong really is a Grade 8 bolt? Our experts discuss Grade 8 bolt strength, head markings, applications, and more in this article. Jul 21, 2017 · SAE American Grades SAE American Grades The SAE marking standard starts with grade 2, indicated by a bolt head with no markings whatsoever. Jan 7, 2017 · Grade 8 bolts exhibit greater tensile, yield, and shear strength as well as greater fatigue resistance and, just as important, are capable of greater torque specs and therefore much greater pre-load and clamping strength. Additonal information on bolts is located at the bottom of the webpage. 6-12. Jul 19, 2024 · These grades help in choosing the right bolt for the required strength, durability, and environmental conditions. For fastening bolts used in different products and applications, bolts of different grades are required to suit the uses. 9: This grade represents a very high-strength bolt. 9, 10. Feb 25, 2025 · These markings indicate: Grade or Strength Level These marks tell you how strong the bolt is and what it's made from. Bolt Grade Markings and Strength Chart • - intafast Industrial Fastenings Jan 8, 2026 · About this item GRADE-5 STRENGTH YOU CAN TRUST: Built to Grade-5 SAE J429 strength standards, this fastener set delivers the ideal balance of toughness and holding power for garage door tracks, opener brackets, gates, and vibration-prone hardware. Discover their material properties, applications, and how to select the right bolt for your project. 5 days ago · Learn what to look for in galvanized bolts and nuts, including types, coatings, strength grades, and key buying considerations for durability and corrosion resistance. Except for the very lowest grades metric nuts and bolts all carry identification markings which indicate their strength. Dec 11, 2025 · Get a quick reference to bolt grades, including head markings and tensile values. Bolts and screws also bear a mark to identify the manufacturer. Understand grade 5 bolt strength, how to read grade 8 bolt markings, and more. typically strong, heat-treated metric bolts are grade 8. Mar 28, 2022 · The strength grade of the bolt is divided according to the hardness, force, and yield of bolt raw materials. (the ratio of the Proof (or Yield ) stress and the Tensile strength expressed as a percentage = 100. S. Tensile strength is the amount of pull the bolt can withstand before breaking. 8, 5. Selecting the appropriate bolt strength is a crucial decision in many engineering, construction, and manufacturing projects. ASTM A307 Grade A: Suitable for bolts, studs and screws for general applications, with a minimum tensile strength of 60 The first number is the tensile strength of the bolt material (N 2 )/100. More on SAE J429 grades, specifications, and head markings here. Heat-treated bolts are not designed for use in threaded holes because steel plates or structural members are usually soft carbon steel or unhardened alloy steel. 9 & 14. 9 grade steel and cryo treatment results in a bolt that is 3 to 4 times stronger than OEM bolts and 2 times stronger than titanium. Metric steel bolts, screws and studs - proof and tensile strength. The round head and square neck design provide a smooth, finished Bolts with material grades exceeding 8. We will outline the structure of the bolt grades chart, which typically includes columns for grade numbers, properties (such as tensile strength and yield strength), and common applications. Compare stainless steel bolt classes (A2-50, A2-70, A4-80, Class 100): head markings, yield and tensile strength, and PSI/MPa. 6 days ago · Class 8. The grades are typically indicated by markings engraved on Metric Steel Bolts - Grades and Property Classes Metric steel bolts, screws and studs - proof and tensile strength. Lightning Bolt has Grade 5 Bolts & Grade 5 hex cap screws IN STOCK! Many don’t realize, but when you need Grade 5 bolts, you are looking for medium strength carbon steel. The metric bolt grades have specific bolt strength grades. Grade 8. Comparison of Shear Strengths of Grade 2, 5 and 8 Screws The industry standard for determining shear strengths of fasteners is to take 60% of the minimum Ultimate Tensile Strength of the fastener for single shear joints and 120% for double shear joints. Understand the interplay with other components – The bolt grade must be compatible with the materials of the components it will be fastening. strength standards， help you accurately select appropriate bolts in actual work. Note: Some bolts share identical head identification and have significantly different strengths. 8. No matter the system, the higher the number the greater the strength of the Sep 18, 2024 · Learn the essentials of bolt and nut grades, including SAE, ISO, and ASTM standards. Dec 28, 2023 · High-grade bolts offer not only greater strength but also better longevity, especially in fluctuating or dynamic load situations. In general, the higher the grade number, the stronger the bolt. SAE grade 5 tensile strength is 120,000 psi, grade 8 is 150,000 psi, socket head cap screws (Allen bolts) are 180,000 psi, as are L9 bolts. The combination of 12. Ask now. Bolt grades are a standardized way of categorizing bolts based on their mechanical properties, such as tensile strength, yield strength, and hardness. 8, A4-80, A2-70), what their head markings mean, and how their proof load, yield strength, and tensile strength compare. Nov 5, 2019 · Learn what metric bolt grades mean, how to read head markings, and where 12. METRIC BOLT GRADES AND STRENGTH CALCULATOR Metric bolt grades and strength calculator to show proof strength, tensile strength, Vickers / Brinell hardness, minimum breaking torque and stress area of metric bolts and screws made of carbon steel and alloy steel with designations 4. These grades ensure that bolts meet the specific demands of different applications. 6 are less strong, even though the number is higher? Apr 25, 2022 · Grade 8 bolts are designed to deal with heavy loads and high stress, are ideal for structural loads and have a minimum tensile strength of to 150,000 pounds per square inch of pressure. Grades of Bolts - Bolt Grade Marking Chart, p2 Grades of Bolts - Bolt Grade Marking Chart, p3 Tensile Strength: The resistance of a material to breaking under tension Yield Strength: The stress at which a speci c amount of deformation is produced Proof Load: An axial tensile load which the product must stand without evidence of any Nov 8, 2022 · The metric bolt grades are designated by a symbol of 2 numbers, separated by a decimal. All heads of bolts, have markings and indicators to specify the grade of the bolt.

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