https://jp.misumi-ec.com/tech-info/
https://www.nmri.go.jp/archives/eng/khirata/metalwork/index_j.html
Weight Calculator
https://d-engineer.com/unit_formula/weight_cal.html
Technical Data
https://jp.misumi-ec.com/archive/pdf/fa/2015/15-65.pdf
Bolt Specification
https://jp.misumi-ec.com/pdf/fa/2015/p1_2363.pdf
Hole Specification
https://assyweb.misumi.jp/plus1/doc/kikaku/common_anasiyou.pdf