2 RPTT and SR are classic Soviet/Russian national standard circular connectors. As core interconnect components for Russian military, vehicle electronics, marine industrial control, and instrumentation, they offer extremely high compatibility for domestic substitution, supporting repair, retrofitting, and full-system integration of Russian-standard equipment. The product consists of plugs and receptacles, available in panel-mount and cable-connector configurations. Both straight and elbow designs are supported to accommodate panel mounting, cable adapters, and corner routing in diverse operating conditions. Every model comes standard with a rubber protective boot. Combined with washers and gaskets, it delivers excellent dust protection, effectively preventing debris ingress to ensure stable long-term electrical performance. A threaded locking mechanism paired with a unidirectional keyed housing ensures secure mating, vibration resistance, anti-loosening, and prevention of misconnection, while simplifying installation and maintenance. Core contacts feature silver plating for superior conductivity, stable contact resistance, wear resistance, and high electrical reliability. The series covers both shielded and unshielded variants, with tail nut options including straight-through and conduit types for extensive selection. 【16# Housing】 (16 models): SR16P2ES5, SR16P2EG5, SR16Z2ES5, SR16Z2EG5, SR16P3ES6, SR16P3EG6, SR16Z3ES6, SR16Z3EG6, SR16P2S5, SR16P2G5, SR16Z2S5, SR16Z2G5, 2RPTT16P2ES5, 2RPTT16P2EG5, 2RPTT16P3ES6, 2RPTT16P3EG6 【20# Housing】 (16 models): SR20P2ES7, SR20P2EG7, SR20Z2ES7, SR20Z2EG7, SR20P3ES8, SR20P3EG8, SR20Z3ES8, SR20Z3EG8, SR20P2S7, SR20P2G7, SR20Z2S7, SR20Z2G7, 2RPTT20P2ES7, 2RPTT20P2EG7, 2RPTT20P3ES8, 2RPTT20P3EG8 【28# Housing】 (14 models): SR28P4ES12, SR28P4EG12, SR28Z4ES12, SR28Z4EG12, SR28P5ES14, SR28P5EG14, SR28Z5ES14, SR28Z5EG14, SR28P4S12, SR28P4G12, SR28Z4S12, SR28Z4G12, 2RPTT28P4ES12, 2RPTT28P4EG12 【32# Housing】 (14 models): SR32P5ES16, SR32P5EG16, SR32Z5ES16, SR32Z5EG16, SR32P6ES18, SR32P6EG18, SR32Z6ES18, SR32Z6EG18, SR32P5S16, SR32P5G16, SR32Z5S16, SR32Z5G16, 2RPTT32P5ES16, 2RPTT32P5EG16 【36# Housing】 (14 models): SR36P6ES20, SR36P6EG20, SR36Z6ES20, SR36Z6EG20, SR36P7ES22, SR36P7EG22, SR36Z7ES22, SR36Z7EG22, SR36P6S20, SR36P6G20, SR36Z6S20, SR36Z6G20, 2RPTT36P6ES20, 2RPTT36P6EG20 【40# Housing】 (14 models): SR40P7ES24, SR40P7EG24, SR40Z7ES24, SR40Z7EG24, SR40P8ES26, SR40P8EG26, SR40Z8ES26, SR40Z8EG26, SR40P7S24, SR40P7G24, SR40Z7S24, SR40Z7G24, 2RPTT40P7ES24, 2RPTT40P7EG24 【48# Housing】 (12 models): SR48P8ES28, SR48P8EG28, SR48Z8ES28, SR48Z8EG28, SR48P9ES30, SR48P9EG30, SR48Z9ES30, SR48Z9EG30, SR48P8S28, SR48P8G28, 2RPTT48P8ES28, 2RPTT48P8EG28 【55# Housing】 (10 models): SR55P9ES32, SR55P9EG32, SR55Z9ES32, SR55Z9EG32, SR55P10ES35, SR55P10EG35, SR55P9S32, SR55P9G32, 2RPTT55P9ES32, 2RPTT55P9EG32 【60# Housing】 (10 models): SR60P10ES38, SR60P10EG38, SR60Z10ES38, SR60Z10EG38, SR60P11ES40, SR60P11EG40, SR60P10S38, SR60P10G38, 2RPTT60P10ES38, 2RPTT60P10EG38