Major fastener manufacturers (Yamaha Fastener, Sanko, Nabeya) publish tables that exactly replicate JIS B1051 property classes on their product spec sheets. These are free PDFs and legally safe.
The standard applies to carbon and alloy steel fasteners under the following conditions: Intertek Inform Jis B 1051 2000 PDF - Scribd
A critical aspect of JIS B 1051 is its use of a two-number designation for property classes, such as . The first number represents 1/100th of the nominal tensile strength in MPa, while the second indicates the ratio of yield strength to tensile strength. For example, a class 10.9 bolt has a tensile strength of 1,000 MPa and a 0.9 ratio, giving it a high yield strength. jis b1051 pdf free
The standard covers a wide range of fasteners, specifically "bolts, screws and studs made of carbon steel and alloy steel when tested at an ambient temperature range of 10°C to 35°C". This specification is technically aligned with its international counterpart, , ensuring that a fastener made to JIS B 1051 in Japan meets similar performance benchmarks as one made to the global standard. In fact, JIS B 1051 is often described as the Japanese equivalent of the ISO 898-1 standard for bolt mechanical properties.
Specifies properties for fasteners tested at ambient temperatures ( 10∘C10 raised to the composed with power C 35∘C35 raised to the composed with power C The first number represents 1/100th of the nominal
Evaluates both the tensile strength of the fastener and the integrity of the transition zone between the head and the shank.
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 general assembly 8.8 Automotive chassis
Many global fastener manufacturers publish comprehensive technical appendices in their catalogs that reprint the exact torque, yield, and tensile tables from JIS B1051 for customer reference completely free of charge.