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It is the direct Japanese counterpart to the international standard and the American ASTM F568M . Understanding this document is critical for ensuring fastener safety, torque consistency, and failure prevention in everything from automotive assembly to bridge construction.
is the Japanese Industrial Standard that specifies the mechanical and physical properties of fasteners (bolts, screws, and studs) made of carbon steel and alloy steel. The current version of this standard is JIS B 1051:2014 , which is technically identical to the international standard ISO 898-1:2013 . Core Technical Specifications jis b1051 pdf free
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The strength of the fastener is indicated by a two-digit code (e.g., 8.8, 10.9, 12.9). Specifies the nominal tensile strength in Second Digit ( ×10cross 10 Always respect intellectual property rights and adhere to
It covers tensile strength, yield stress, hardness, and ductility requirements. Key Sections of the JIS B1051 Standard
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Fasteners are designated by two numbers (e.g., 8.8, 10.9). The first number represents in MPa, and the second represents the ratio of yield strength to tensile strength. Property Class Nominal Tensile Strength (MPa) Yield Strength (MPa) Typical Material 4.6 / 4.8 Low or medium carbon steel 5.6 / 5.8 Low or medium carbon steel 8.8 Medium carbon steel (Quenched & Tempered) 10.9 Alloy steel (Quenched & Tempered) 12.9 Alloy steel (Quenched & Tempered) 3. Key Testing Requirements Tensile Strength ( Rmcap R sub m