Because Japan continuously updates its JIS standards to align with international trade requirements, the technical specifications, testing procedures, and property class definitions in JIS B1051 are functionally identical to ISO 898-1 for most standard metric sizes. If your manufacturing floor uses ISO 898-1 compliant fasteners, they will generally meet the requirements of a JIS B1051 specification. Crucial Testing Methods Defined by the Standard
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of fasteners (bolts, screws, and studs) made of carbon steel and alloy steel. It is the Japanese equivalent of the international Covers thread sizes from M1.6 to M39. Property Classes: Defines strength grades like 4.6, 8.8, 10.9, and 12.9.
When working with the Jis B1051 standard, consider the following best practices:
The Japanese language version of JIS B 1051:2014 is available in its entirety for free at kikakurui.com. This resource reproduces the complete standard in Japanese and includes the full table of contents and detailed technical sections. For Japanese readers or those who can navigate the language, this represents the most complete free access available. jis b1051 pdf free
The American National Standards Institute offers JIS standards through their international gateway.
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
If you need the data inside JIS B 1051 without breaking the law or risking your network, consider these alternatives: 1. Use ISO 898-1 Equivalency
If you work for a Japanese OEM (Toyota, Honda, Hitachi) or a supplier in their chain, your QA department likely has a corporate subscription to the entire JIS library. Request the PDF internally – many companies allow read-only access on secure servers. Because Japan continuously updates its JIS standards to
If you prefer a traditional book, the standard is also available as a printed booklet for the same price as the PDF. This can be useful for those who prefer a physical reference on their desk.
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Does not cover set screws or fasteners that are not subject to standard tensile stresses, which are instead regulated under standards like JIS B 1053 . of fasteners (bolts, screws, and studs) made of
Applies to sizes from M18×1 up to M39×3 .
Although the precise content of JIS B1051 may not be publicly disclosed without official access, it is reasonable to infer that it outlines technical requirements for a specific mechanical process, component, or material. For instance, it might specify:
To comply with JIS B1051, manufacturers must subject fasteners to rigorous mechanical testing. These tests ensure the components will not shear or deform prematurely under load: