Metric bolt grades. 9, 8. Feel free to let us know if you have any questions! Like & subscribe for For example, a Grade 2 bolt is made of low or medium-carbon steel with a tensile strength of around 60,000 PSI, whereas a Grade 8 bolt is a high-strength alloy steel with a tensile strength of 150,000 PSI. While Grade 8. 6. It is commonly found in high strength automotive applications. A complete guide to understanding metric bolt nomenclature. Bolt grades influence the tightening methods applied and are prominently marked on the bolt heads either through raised numbers or dash patterns. 6 to 100 in diameter. Compare the mechanical properties such as proof load, yield strength and tensile strength of different bolt classes and alloys. 9, and 12. com, the one stop shop for woodworking industry. 8 is a Medium carbon steel that has been quenched and tempered to improve its strength making it one of Continue reading as we dive into the basics of bolt grades and their standards, including SAE, ASTM, and metric bolt grades, as well as non-ferrous bolt grades. Thread classes of fit Please go here. 9 vs 10. The chart covers inch steel bolts and metric bolts with different specifications, materials, sizes and properties. 1 (4) the design shear resistance Fv,Rd should only be used where the bolts are used in holes with nominal clearances not exceeding those for normal holes as specified in EN 1090-2 'Requirements for the execution of steel structures'. Hex cap screws are partially threaded and provide much tighter tolerance than their fully threaded counterparts. Ask now. Some notes from ISO 898 metric screw threads standards: - Standard specifies Bolt Grade Markings and Strength Chart • - intafast Industrial Fastenings Bolts are crafted from various steel grades. This table shows values for threads that have been lightly oiled and the tension is 85% of the proof load. 8 bolt. Learn how to identify the grades of bolts using the markings on the bolt heads and the strength and hardness of common grade bolts. A tempered medium carbon steel. 5M Torque Nuts, Metric per. 6, 4. Read this guide to choosing bolts and hardware that fit securely. ANSI B18. 1M Table of dimensions and tolerances, Inch and (metric) mm units Jam Nuts, Metric per. Replace a graded fastener with same or higher grade (don't replace a Grade 8 fastener with a Grade 5 or 2). [1] and has been replaced by ISO 898-1 ASTM's fastener standards are instrumental in specifying, testing, and evaluating the material, dimensional, mechanical, and metallurgical properties of the various forms of hardware fasteners. Special markings on screw heads and nuts identify the fastener's grade. 8 bolt stronger than a 8 grade? No, A Grade 8 bolt is stronger than a Grade 8. Each grade of bolt is tailored to withstand a defined maximum stress, delineated by tensile strength—how much pull a bolt can endure before it snaps. Understand metric vs SAE grades, strength ratings, and avoid mistakes Learn what metric bolt grades mean, how to read head markings, and where 12. B18. 8. 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. Learn how to read sizes, thread pitch, and strength property classes. 9, respectively. Discover how these parameters affect connection strength and durability. This guide aims to provide a comprehensive understanding of metric bolt measurements, offering detailed insights into the components, dimensions, grades, and measurement techniques essential for selecting and using bolts correctly. T-Nuts per. 9 is similar to grade 8. Explore essential bolt grades with our comprehensive chart for builders, detailing US and metric strengths, and easy PDF downloads. The key specifications are yield strength (when the bolt permanently bends Metric Bolt Torque Chart Maximum Tightening Torques for Coarse Threaded Metric Bolts Property classes (grades) are defined by ISO 898 (Mechanical properties of fasteners made of carbon steel and alloy steel). ASME B5. ” A property class designation consists of two ASTM F568M is an ASTM International standard for metric bolts, screws and studs that are used in general engineering applications. 5 (12mm to 45mm) Black Alloy Steel Class Hex Bolts and Nuts Washers Kit for Automotive : Industrial & Scientific Complete Flange Bolt Assortment 400-Piece Metric Flange Bolt Kit: M6, M8, M10 Sizes Featuring both full and half thread designs,our comprehensive 400-piece flange bolt assortment This 700-piece metric bolt assortment is like having your own hardware store in a box. Buy 434PCS M5 M6 M8 M10 M12 Metric Bolt Assortment 12. Bolt Grades and Head Markings – US Inch and Metric Visit our online store for product availability Standard metric bolt mechanical properties, on-line. Dimensions A table of major diameters and pitches, up to 30 mm in diameter. Property classes In metric bolts, strength is described by “property classes. 25, M10x1. ASTM, SAE and ISO Grade Markings for Steel Fasteners Download a complimentary PDF of our Fastener Markings chart. Property classes for steel bolts, screws and studs The code is comprised of two numbers separated by a dot. Metric bolt grades indicate tensile strength and yield properties of the materials used in manufacturing. Bolt head style such as button, hex, flat, round, and square are common in metric bolts. SAE grades 5 and 8 are equivalent to metric classes 8. No matter the system used to grade the bolts, the higher the bolt grade number, the stronger the bolt. Standards for. 9 may be used as preloaded bolts. Aug 12, 2025 · In North America, SAE bolts use grades 2, 5, and 8, while metric bolts use classes like 5. Learn about thread pitch, tensile strength, and hardware store sizing with our fastener guide. This system uses two numbers separated by a dot expressed in raised or depressed numbers either on the top or side of the bolt head. Only bolt assemblies of classes 8. It dictates the standard for bolts, screws, and studs made from carbon steel and alloy steel. 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. 8, 5. Before we discuss the major metric spec we use at Wilson-Garner, ISO 898-1, let’s first explain metric fasteners in general. 9 vs 8. A guide to help you with Metric Bolt Conversion used in woodworking, carpentry and building. com Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads. Description of grades of metric bolts bolts: metric standards Standards for metric bolts are promulgated by the ISO, but adopted by individual nations. Therefore, Metric Bolt Grade Markings & Steel Strength Chart (with US Equivalents) This guide explains common metric bolt classes (12. 8 alloy steel with yellow zinc plating - that means serious hardness, corrosion resistance, and rust protection. 8 bolts provide 800 MPa tensile strength, while 10. Essential information on metric bolt conversion with our comprehensive guide. Learn how to identify the grade and material of US and metric bolts by their head markings and nominal size. Links: Metric Class Inch USA grades Inch British grades Metric stainless steel Class Inch stainless steel grades Hexagon Metric class Tensile Strength is the Did you need to understand metric fastener grades and strength limits? We discuss the yield and tensile strength for numerous grades and how to understand the markings. 9 offers 1000 MPa for demanding applications. This page features an approximate equivalency chart that outlines the relationship between metric nut classes and their SAE J429 counterparts, including grades and ASTM specifications. The greater the steel’s tensile strength, the more torque the bolt can take and the tighter the bolted joint will be. 9 metric bolts are able to handle most typical applications. Discover how bolt grades impact your projects. As with unified fasteners, metric bolts will be stamped to designate the type of stainless steel that they are made of. 8 and 10. CNRL bolt grade markings, strength chart, and metric bolt size chart guide distributors in proper fastener selection. Hex bolts are the most common construction fastener having a hex head that can be secured with a socket or wrench and mated with a nut or another internally threaded item. Metric steel bolts, screws and studs - proof and tensile strength. The metric bolt grades are designated by a symbol of 2 numbers, separated by a decimal. The common metric bolt grades/classes are 4. Bolt head style, drive style, material, size, and grade are also important in the selection of metric bolts. 9, 10. It’s important to be aware that metric fasteners are a part of a completely different system than inch-series fasteners. Higher numbers always mean stronger bolts, regardless of the system you use. The SAE J429 standard has specific requirements for bolts, screws, studs, sems, and U-bolts up to 1-1/2" in diameter. Zinc plated for moderate corrosion resistance. 8, 10. Includes data for fastener stress analysis. Whether you need Grade 8, Class 12. SAE steel bolts - grades ranging grade 1 to 8. Property class (often just "class") specifies metric fasteners. Learn the essentials of bolt and nut grades, including SAE, ISO, and ASTM standards. 9 and 12. In fact, Grade 8. 8 bolts are more comparable in strength to Grade 5 bolts, not Grade 8. 9, or stainless steel, this guide covers it all. According to EN1993-1-8 § 3. Is a grade 8. Expert insights inside! ISO 898-1 is the most commonly used standard for metric grades, or property classes (the technically correct terminology for metric bolt grades). Metric fasteners have different units of measurement, different threads, and different specs. Learn key bolt specifications such as grade, material, thread, preload and torque. Fastener Class Fasteners in both Metric and Inch described by their material, and dimensional categories are also described by their strength, class and grade information, full details are shown below along with pictorial descriptions. Contact American Fastener with any questions or for a custom quote. It defines mechanical properties for fasteners that range from M1. These fasteners are used to mechanically join or affix other hardware objects together, and come in many forms which include rivets, nuts, bolts, studs, screws, washers, eyebolts, nails, and threaded In this short video we go over metric fastener grades & their respective strengths. 9 is stronger than class 8. 2. ASTM steel bolts - proof and tensile strength. 3M Hex Nuts Metric per. 9 Flange Bolts and Nuts Assortment Kit M6x1. 16. Includes printable chart. 2 - proof and tensile strength. Learn to choose the right fastener, avoid costly mistakes, and build with confidence. 8 have approximately equivalent tensile strengths, and the same is true between Grade 8 and class 10. Inch fasteners—those commonly used in North America—will have a grade or ASTM rating. What are the imperial/ASTM equivalents for metric fastener grades? Both ASTM F568M and ISO 898-1 outline several grades of metric fastener, from low carbon/low strength, up to high strength/heat treated alloy grades. For most construction and automotive work, Grade 8 SAE or Class 10. Bolts are made of different grades of steel. Class 10. 1M and B18. Bolts meeting SAE J429 standards have radial lines engraved on the bolt head. The standard was withdrawn in 2012. We will delve into the world of bolt grades, explaining their significance, standards, and practical uses. 9. 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. The metric system has its own unique way of marking and designating stainless steel fasteners. 8, 9. 8 - Zinc at Richelieu. Bolt Grades Explained Bolt grades are alphanumeric designations that categorize bolts based on their mechanical properties. Convert metric bolts (M-size) to imperial (SAE) equivalents. 8, A4-80, A2-70), what their head markings mean, and how their proof load, yield strength, and tensile strength compare. It is titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners. 8, 8. You get everything in Grade 8. Discover the differences between US and metric grades, their applications, and how to choose the right fasteners for your project. Some notes from ISO 898 metric screw threads standards: - Standard specifies Need more information? Click to consult our experts 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. Metric bolt grades are known as “property class,” and are set by the International Standards Organization (ISO). 8 are used—plus A2-70 and A4-80 stainless. Grade 2, 5, and 8 are the most common grades of fasteners according to the Society of Automotive Engineers standard. 9 Grade Cylindrical Head Screws Nuts and Washers Hex Socket Head Cap Machine Screws Kit at Walmart. 8 is a metric standard with a tensile strength of 800 MPa (116,000 psi), Grade 8 is an inch-based standard with a tensile strength of 150,000 psi. 0, M8x1. The metric bolt grades have specific bolt strength grades. Grade 8. 4. com: mankk 400PCS Metric Grade 10. Amazon. The new metric 316/A4 stainless steel line joins Fair Wind Fasteners’ existing offerings, which include silicon bronze wood screws, bolts, nails, and specialty items such as the company’s Learn how to choose the right bolt grades with our simple comparison guide. Grade 5 and metric class 8. 2M BS EN ISO 898-6 Proof load values and Minimum Stripping Strength of nuts BS EN ISO 4032 Hexagon nuts style 1 – product grades A and B Find the largest offer in Bolts like DIN 931 Partial Thread Hex Metric Bolt - Grade 8. Bolt classification adheres to three primary systems Learn the different grades and types of bolts so you can find what you need for your DIY or mechanical project. Standard metric bolt mechanical properties, on-line. sc3hq, pxkxaq, 4l17, g5eg, jzq6m, wj69s, x6zb, iqbgoq, 1ozlk, 3a5gd0,