The 10-101949-020 is a mounting flange gasket designed for Amphenol miniature cylindrical connectors (PT and PC types) in shell size 20. This gasket provides sealing and mounting interface between the connector and the equipment panel or enclosure. The gasket features an inner diameter (R) of 1.156 inches (±0.010) and an outer diameter (S) of 1.438 inches (±0.010), with a thickness (T) of 0.024 inches (±0.008). It is compatible with MIL-C-26482 Series 1 connector standards and is commonly used in aerospace, military, and industrial applications requiring reliable environmental sealing and mechanical mounting of miniature cylindrical connectors.