Bolt Strength Grades. 9. For fastening bolts used in different products and applications,

9. For fastening bolts used in different products and applications, bolts of different grades are required to suit the uses. 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. 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. 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. We are totally committed to our merchant distributors and the fastening industry of New Zealand. 8 Anchor Bolt in India, Buy Class 8. 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. A grade 2 bolt made of low-carbon steel has a tensile strength of 64,000 pounds per square inch or less. Bolt Strength Requirements by Grade All specifications are ASTM unless otherwise noted. Jul 1, 2025 · This article will systematically analyze the grades of bolts. Dec 18, 2024 · Learn about the different grades of bolts, including Grade 2, Grade 5, Grade 8, and high-strength alloy bolts. Additonal information on bolts is located at the bottom of the webpage. It's always a good practice to use a torque wrench when tightening bolts. Heat treated in a controlled atmosphere, these bolts can be identified by the three distinct marks located on the bolt head. 25-4 inches in size. The common metric bolt grades/classes are 4. Q & T - Quenched and Tempered. 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. OEM Supply (NZ) Ltd supplies High Tensile, Bolts, Nuts, Washers, Flange Bolts, 12 Point Bolts, Grade 9 Bolts, in New Zealand and overseas. 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. Feb 16, 2025 · Structural bolts are high-strength fasteners used to connect steel members in buildings, bridges, and industrial structures. On the head of each bolt there are two numbers which are separated by a decimal point. 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. 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. 6 days ago · Class 8. 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. 8. Explore SAE, ISO, and ASTM standards for safety and performance. Note: Some bolts share identical head identification and have significantly different strengths. 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. 8 wedge style expansion anchor, Sleeve, Toggle Bolts and L Shaped Anchor Bolts in all sizes and dimensions. Mar 3, 2022 · SAE J429 is the standard developed for bolt, screw, stud, sem, and U-bolt specifications. 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. The first number is the tensile strength of the bolt material (N 2 )/100. The second number is = 1/100. Steel Bolts - SAE Grades SAE steel bolts - grades ranging grade 1 to 8. There exists an often quoted myth, that Grade 5 bolts are better in shear than Grade 8 since they will bend before breaking. Grade 8. 8 strength, zinc plating, and fast shipping. I assume the ones marked grade 12. 8, A4-80, A2-70), what their head markings mean, and how their proof load, yield strength, and tensile strength compare. 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. Discover their material properties, applications, and how to select the right bolt for your project. Except for the very lowest grades metric nuts and bolts all carry identification markings which indicate their strength. 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. 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. Designed for strength and durability. These grades ensure that bolts meet the specific demands of different applications. Expert insights inside! Jun 21, 2023 · The tensile strength of bolts varies depending on their grade or material composition. 40 sets (40 bolts plus 40 nuts). 9 and choose the right strength level for your project with Jingle fasteners. 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. Information on the strength requirements of the different grades of construction fasteners. Understand bolt grades from SAE 2 to ISO 12. Compare stainless steel bolt classes (A2-50, A2-70, A4-80, Class 100): head markings, yield and tensile strength, and PSI/MPa. 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. Includes printable chart. strength standards， help you accurately select appropriate bolts in actual work. Jul 28, 2023 · From SAE to ASTM to ISO, learn all about bolt grades, tensile strengths, and suitable applications. 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. 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). May 7, 2025 · In general, no. Request a Quote 3 days ago · Looking for high grade steel bolts gotrax traveler? Discover top-rated, verified suppliers with Grade 8. The nut manufacturer, at his option, may add other markings to indicate the use of atmospheric corrosion resistant steel. Feb 15, 2019 · You can usually figure out the grade, or strength, of a bolt by looking at the markings on its head. Metric steel bolts, screws and studs - proof and tensile strength. 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. The bolt grade is a measure of the tensile strength of a bolt. 2 - proof and tensile strength. May 20, 2025 · Discover how bolt grades impact your projects. Learn tensile strength, markings, and applications. Learn the differences between Grade 5, Grade 8, and Grade 9 bolts - strength specs, markings, applications, and how to choose right. Bolt strength can be divided into ordinary grade and high strength grade. 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. 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. 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. 6-12. 9 vs 10. 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. 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. 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. Nov 5, 2019 · Learn what metric bolt grades mean, how to read head markings, and where 12. 9 12. Whether you need Grade 8, Class 12. 9, 10. 9 grade steel and cryo-treated for enhanced strength, these bolts are the ultimate in strength designed to withstand the toughest conditions. 9 bolts and studs. It is crucial to use the right kind of bolt per application. Tensile Strength: The maximum load a bolt can handle without breaking. 9 metric bolt. For bolts, you can find the SAE J429 grade displayed in radial lines on the head, which indicate the grade and strength requirements. Bolt grades are alphanumeric designations that categorize bolts based on their mechanical properties. Always pay close attention to the head of a bolt to ensure it is the right strength bolt. Hardware Menu Hex Bolt Identification, Markings and Strength Chart Table Guide Hex Bolt Identification, Markings and Strength Chart. 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. We would like to show you a description here but the site won’t allow us. A chart to identify bolt grades using bolt grade markings; also provides a strength chart for common grade bolts. 8 10. 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. 9 and 12. 8, 5. ISO/Metric Nov 28, 2023 · Gain a solid understanding of bolt weight and strength grades with our comprehensive table. The round head and square neck design provide a smooth, finished Bolts with material grades exceeding 8. 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. Unknown to most, a class 8. Learn to choose the right fastener, avoid costly mistakes, and build with confidence. Selecting the appropriate bolt strength is a crucial decision in many engineering, construction, and manufacturing projects. Understand grade 5 bolt strength, how to read grade 8 bolt markings, and more. All specifications shall be marked by the manufacturer with a unique identifier to identify the manufacturer or private label distributor, as appropriate. 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. 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. Learn the difference between proof load, yield strength and tensile strength, and how to shop for bolts by grade. The greater the tensile strength of the bolts, the more torque the bolts can take and tighter the joint can be fixed. You'll spot them as raised lines or numbers on the bolt head. 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. Property classes for steel bolts, screws and studs The code is comprised of two numbers separated by a dot. They determine the maximum amount of load the bolt can handle as well as the method that can be used for tightening the bolt. 9 vs 8. 9 & 14. Understand the interplay with other components – The bolt grade must be compatible with the materials of the components it will be fastening. 8, 8. 9, and stainless steel bolts. Nov 14, 2025 · Complete guide to bolt grades. typically strong, heat-treated metric bolts are grade 8. Find out the bolt grade markings and strength chart for US and metric bolts. 6, 4. SAE steel bolts - grades ranging grade 1 to 8. Manufacturer and supplier of Grade 8. 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. These grades are assigned by standards bodies like SAE (Society of Automotive Engineers) in the U. 9, 8. They provide strong, reliable, and durable connections in structural steelwork, ensuring safety and stability under various loading conditions. 8 are used—plus A2-70 and A4-80 stainless. The combination of 12. The metric bolt grades have specific bolt strength grades. AFT Technical Resources. 9, or stainless steel, this guide covers it all. English bolts are categorized by grade and metric by strength class. Mar 28, 2022 · The strength grade of the bolt is divided according to the hardness, force, and yield of bolt raw materials. More on SAE J429 grades, specifications, and head markings here. Dynamic vs static loads play no part in bolt strength. 8, 9. It has a tensile strength of around 1000 MPa and a yield strength of 900 MPa. Apr 4, 2025 · Learn about bolt and nut grades, their importance in projects, and how to select the right fasteners. In general, the higher the grade number, the stronger the bolt. 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. 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. 9: This grade represents a very high-strength bolt. 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. Both grade 5 and grade 8 are available in plain steel and zinc plated steel. Specifications — ASTM A563 — Carbon and Alloy Steel Nuts. CNRL bolt grade markings, strength chart, and metric bolt size chart guide distributors in proper fastener selection. 8 bolts are commonly used in structural steel connections subjected to heavy loads and are prevalent in many construction projects. 8, 10. A bolt grade refers to the mechanical properties of the bolt—mainly tensile strength, yield strength, and hardness. 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. Jul 19, 2024 · These grades help in choosing the right bolt for the required strength, durability, and environmental conditions. Tensile strength is the amount of pull the bolt can withstand before breaking. Ask now. Make informed decisions and ensure the success of your mechanical engineering projects. Bolts and screws also bear a mark to identify the manufacturer. 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 a standardized way of categorizing bolts based on their mechanical properties, such as tensile strength, yield strength, and hardness. 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. If strength is important, ensure that both the grade and manufacturer identification markings are present. 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. Compare composition, mechanical properties, and strength. 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. Aug 21, 2025 · Complete fastener grades guide covering SAE Grade 2-9, metric 4. Apr 19, 2022 · Knowing the different grades of bolts and their tensile strength can help you choose the right type for your application. A guide to selecting the perfect bolt for your project. 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. (the ratio of the Proof (or Yield ) stress and the Tensile strength expressed as a percentage = 100. 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. All heads of bolts, have markings and indicators to specify the grade of the bolt. ASTM A194/A194M — Carbon and Alloy Steel Nuts for Bolts for High Pressure and High Temperature Service. Hardnesses are Brinell Hardness Numbers. Feb 27, 2014 · Bolting Property Classes 8. S. Discover their applications and how to choose the right one for your project. 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. No matter the system used to grade the bolts, the higher the bolt grade number, the stronger the bolt. High-tensile bolt grades refer to bolts designed to withstand heavy loads and extreme conditions. Discover the differences between US and metric grades, their applications, and how to choose the right fasteners for your project. Grade 10. Dec 28, 2023 · High-grade bolts offer not only greater strength but also better longevity, especially in fluctuating or dynamic load situations. 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. 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. Tensile strength is the maximum amount of pulling force a material can withstand before it breaks. Dec 11, 2025 · Get a quick reference to bolt grades, including head markings and tensile values. Download a printable stainless chart (PDF). Machined from 12.

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