Get Price. Free sample 2ml hplc 8-425 glass vial with pp cap Thermo. 2mL Standard Opening Vials from Supelco | Sigma-Aldrich. 2021 - 03 - 23. 2 mL Standard Opening Vials from Supelco. Our standard 2 mL vial is 12 mm in diameter, 32 mm in height, and has a 4.6 mm opening. The thread size on this vial is 8-425.