+150∘Cpositive 150 raised to the composed with power cap C Tensile Strength ( Rmcap R sub m ): Minimum strength in (e.g., Class 8.8 = Yield Point ( ReLcap R sub e cap L ): Nominal lower yield stress.
The standard was significantly updated in 2014 to align with the international standard ISO 898-1:2013 日本規格協会 JSA GROUP Webdesk Standard Details Full Title
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Property class markings are required for many products. 3. Key Differences Jis B 1051 2000 PDF - Scribd
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Below is a technical summary of the standard’s key provisions and property classes. 1. Scope and Application
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What or bolt size (e.g., M10 Grade 10.9) are you designing for?
Outlines requirements for tensile strength, yield stress, and hardness. Where to Find the Standard +150∘Cpositive 150 raised to the composed with power
10.9 fasteners have a higher tensile strength and yield strength than 8.8. A 10.9 bolt is suited for higher-stress applications.
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Defines strength levels, such as 4.6, 4.8, 5.6, 5.8, 6.8, 8.8, 9.8, 10.9, and 12.9. Tensile Strength ( Rmcap R sub m ): The maximum stress a material can withstand. Yield Strength ( Recap R sub e Scope and Application Disclaimer: Standards are subject to
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The table below highlights critical threshold metrics specified for high-tensile property classes according to the technical data excerpted from NBK Fasteners Technical Data and Miki Pulley Co. : Property Class Nominal Tensile Strength ( Rmcap R sub m Min. 0.2% Proof Strength ( Rp0.2cap R sub p 0.2 end-sub Min. Vickers Hardness (HV) Max. Vickers Hardness (HV) 8.8 10.9 12.9 High-Temperature Behavior and Thermal Realities
It does apply to set screws or similar fasteners that are not under tensile stress (see JIS B1053 for those). Key Revisions: JIS B1051:2000 vs. JIS B1051:2014
Represents 10 times the ratio between the lower yield stress (or proof stress) and the nominal tensile strength. Common JIS B1051 Property Classes Property Class Nominal Tensile Strength (MPa) Minimum Yield Strength (MPa) Typical Applications 4.6 Light-duty brackets, general assembly 8.8 Automotive chassis, structural steel, machinery 10.9 High-stress engine parts, heavy industrial equipment 12.9 Ultra-high strength aerospace, racing components Testing Requirements Mandated by JIS B1051
: Defines property classes (e.g., 4.6, 8.8, 10.9, 12.9) where the first number represents 1/100 of the nominal tensile strength and the second represents 10 times the ratio of yield stress to tensile strength. Material Requirements : Chemical composition limits for different steel grades. Mechanical Properties