BS 2A 226:2019
Aerospace series. Specification for Bolts, Hexagonal head, Unified short threads below .250 inch, Alloy steel, Cadmium plated. Classification: R<sub>m</sub> = 124 000 – 146 000 lbf/in<sup>2</sup> (855 – 1 007 MPa) at ambient temp +190 ºC. Specification
standard by BSI Group, 10/24/2019