The latest version is , which was established in September 2014 and last confirmed in October 2024.
The American National Standards Institute offers JIS standards through their international gateway.
Example: For class .8, the first digit "8" means the nominal tensile strength is
Disclaimer: Standards are subject to copyright. Ensure any "free" PDF used is for informational purposes and that you verify with current, authorized industry sources for production. jis b1051 pdf free
Because thread pitch (coarse vs. fine) affects the cross-sectional core area of a bolt, JIS B1051 provides exact Newton (N) load capacities for every thread size from M1.6 up to M39. 3. Tightening Torque Guidelines
JIS B1051 plays a critical role in Japan’s manufacturing and engineering sectors by ensuring consistency and quality. While the full PDF is protected by intellectual property rights, it is accessible through official purchases or institutional subscriptions. For those needing immediate guidance, consulting partial references in academic or technical contexts can provide foundational understanding. Prioritize legal access to uphold ethical and legal standards while benefiting from the expertise embedded in Japan’s industrial standards.
To comply with the standard, manufacturers must subject fasteners to rigorous testing regimes: The latest version is , which was established
Applies specifically to nominal sizes from M1.6 up to M39 .
Engineers, manufacturers, and procurement specialists frequently need to verify the material and mechanical specifications of structural fasteners. Finding official, authorized documentation is critical for ensuring compliance and structural integrity.
The standard applies broadly to threaded fasteners used under normal tensile and proof loads. It establishes explicit guidelines for dimensional and performance parameters across multiple thread classifications: Ensure any "free" PDF used is for informational
JIS B1051 is a Japanese Industrial Standard (JIS) that specifies the . Specifically, it covers bolts, screws, and studs when tested at an ambient temperature range of 10°C to 35°C. The standard establishes clear guidelines for: Tensile strength limits Yield strength or proof load characteristics Hardness requirements (Rockwell, Brinell, Vickers) Impact strength for specific property classes Test methods to verify these mechanical properties Key Property Classes (Strength Grades)
The designation numbers provide immediate technical information about the bolt's strength:
Since you cannot legally get the full PDF for free, here is a of the most cited information from JIS B1051:2009, sourced from publicly available JSA previews and industry training materials. This is not a copy but a fair-use educational extraction.
represents 10 times the ratio between the lower yield stress (or proof stress) and nominal tensile strength. For class 8.8, the yield strength is 80% of the tensile strength (approx. 640 MPa). Testing Parameters Mandated by JIS B 1051
: Because of harmonization, the ISO 898-1 standard can often be used in place of JIS B 1051.