Project details

There are various specifications for the outer diameter and wire diameter of the O-ring. In the old national standard, the outer diameter of the O-ring is represented by D, and the wire diameter is represented by d2. For example, the O-ring 202.4 II-2, where 20 represents the outer diameter of the sealing ring as 20mm and 2.4 represents the cross-sectional diameter of the sealing ring as 2.4mm. In the new national standard, the inner diameter of the O-ring is represented by the inner diameter, and the cross-sectional diameter is represented by the cross-sectional diameter. For example, the O-ring 7.51.8-G-N, where 7.5 represents the inner diameter of the O-ring as 7.5mm and 1.8 represents the cross-sectional diameter of the O-ring as 1.8mm.