: Many public libraries and universities have databases and collections that include industrial standards, sometimes for free or at a lower cost than commercial sources.
If you are a student or hobbyist, a free older version found via a deep-web search might suffice for general reference. However, for professional engineering, quality control, or legal compliance , hunting for a "free PDF" is a false economy. The risk of using outdated data outweighs the cost of the official document.
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
Measured using the Vickers (HV), Brinell (HB), or Rockwell (HRC) scales to ensure the surface and core durability of the fastener. NBK【鍋屋バイテック Testing Methods Defined in JIS B 1051
