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Apr 10, 2021 · Let’s walk through how to decipher metric bolt and screw grades, plus their head markings, using one ISO standard and its following property classes as examples: ISO 898-1 Property Class 8.8 Metric Bolt and Screw Head Marking. ISO 898-1 Property Class 10.9 Metric Bolt and Screw Head Marking.
Sep 18, 2024 · Learn the essentials of bolt and nut grades, including SAE, ISO, and ASTM standards. Discover the differences between US and metric grades, their applications, and how to choose the right fasteners for your project. Whether you need Grade 8, Class 12.9, or stainless steel, this guide covers it all.
This chart helps to identify the grades of bolts using the identification marks on the bolt's head along with the strength and hardness of common grade bolts. Please note the bolt heads may also include the manufacturer's identification stamp, especially with high strength bolts.
Bolt Grade / SpecificationMaterialNominal Size (inch)Proof Load PsiGrade 1 - SAE J429 Bolts, Screws and ...Low or medium carbon steel1/4" - 1-1/2"33,000Grade 2 - SAE J429 Bolts, Screws and ...Low or medium carbon steel1/4" - 3/4" >3/4" - 1-1/2"55,000 33,000Grade 5 - SAE J429 Bolts, Screws and ...Medium carbon steel or carbon steel with ...1/4" - 1" >1" - 1-1/2"85,000 74,000Grade 5.1 - SAE J429 SemsLow or medium carbon steel, quenched and ...No. 4 - 5/8"85,000These metric bolt torque charts show the ideal tightening torque for class 8.8, 10.9, and 12.9 bolts for both wet and dry tightening. The bolt’s class indicates its material strength, with higher numbers meaning higher tensile and yield strength.
Yield Strength: The maximum load at which a material exhibits a specific permanent deformation. Proof Load: An axial tensile load which the product must withstand without evidence of any permanent set. 1MPa = 1N/mm 2 = 145 pounds/inch 2. Shop for US Bolts. Shop for Metric Bolts.
Grade 5 bolts are made of medium-carbon steel and are stronger than Grade 2 bolts, while Grade 8 bolts are made of high-carbon steel and are the strongest. The bolt grades and strength chart outlines the physical and mechanical properties of various grades of bolts.
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Aug 2, 2023 · 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.” SAE J429 is one of the most common standards for inch fasteners, and Grade 8 is the highest grade within it.
