ISO 10642 flat head screw with hex drive, 010.9 M20 x 100, Article number 106421020100. Property class / material: steel 10.9, surface finish plain. Flat Head Screw with Hex Drive manufactured to ISO 10642 with ISO metric (M) thread, coarse pitch, partially threaded. Standard parts to the same standard, property class, dimensions and surface finish are interchangeable between manufacturers; confirm the controlling standard revision, any class-society or application approval, and the mating thread before substitution.