Thanks for reply , here is the letter from APIhttps://files.engineering.com/getfile.aspx?folder=2ed9d6b9-043a-49e3-b3d7-f42745bb9190&file=API_Monogram_Bolting_Requirements_Spec_20E_Spec_20F_20190220.pdf
IS it mandatory to mark 1.API monogram, 2. License# & 3. Date of mfg. (mm/yy) on Bolt/nut/stud manufactured as per API-20E & API Spec Q1, If yes then how to comply these requirements on small size bolt (1/2" B7 Bolt)?