B3.5V

There are no known B3.5V standards, and I haven't seen any stars
classified as B3.5V.

Mass(B3.5V) = 5.35+-0.16 Msun ; Eclipsing binary AG Per A ("B3.4V" in Torres10)
Mass(B3.5V) = 4.89+-0.13 Msun ; Eclipsing binary AG Per B (Torres10)
=> adopt Mass(B3.5V) = 5 Msun