2RTT and SR connectors are classic Soviet/Russian GOST standard circular connectors. As core interconnection components for Russian military, vehicle electronics, marine industrial control, and instrumentation systems, they offer exceptional compatibility for domestic substitution, supporting the repair, retrofitting, and full-system integration of Russian-standard equipment. Each product consists of a plug and a receptacle, available in panel-mount and cable-termination versions, with both straight and angled configurations to suit panel mounting, cable adapters, and corner routing applications. All models come standard with rubber protective boots, paired with washers and gaskets for superior dust protection that effectively prevents debris ingress and ensures stable long-term operation. The threaded locking mechanism combined with a single-polarity keyed housing guarantees secure mating, vibration resistance, anti-loosening performance, and prevention of incorrect insertion, while facilitating easy assembly and maintenance. Core contacts feature silver plating for excellent conductivity, stable contact resistance, high wear resistance, and superior electrical reliability. The series is available in shielded and unshielded variants with various rear nut options, including through-type and conduit-entry styles, offering extensive selection flexibility. [Shell 16] (16 models): SR16P2ES5, SR16P2EG5, SR16Z2ES5, SR16Z2EG5, SR16P3ES6, SR16P3EG6, SR16Z3ES6, SR16Z3EG6, SR16P2S5, SR16P2G5, SR16Z2S5, SR16Z2G5, 2RTT16P2ES5, 2RTT16P2EG5, 2RTT16P3ES6, 2RTT16P3EG6 [Shell 20] (16 models): SR20P2ES7, SR20P2EG7, SR20Z2ES7, SR20Z2EG7, SR20P3ES8, SR20P3EG8, SR20Z3ES8, SR20Z3EG8, SR20P2S7, SR20P2G7, SR20Z2S7, SR20Z2G7, 2RTT20P2ES7, 2RTT20P2EG7, 2RTT20P3ES8, 2RTT20P3EG8 [Shell 28] (14 models): SR28P4ES12, SR28P4EG12, SR28Z4ES12, SR28Z4EG12, SR28P5ES14, SR28P5EG14, SR28Z5ES14, SR28Z5EG14, SR28P4S12, SR28P4G12, SR28Z4S12, SR28Z4G12, 2RTT28P4ES12, 2RTT28P4EG12 [Shell 32] (14 models): SR32P5ES16, SR32P5EG16, SR32Z5ES16, SR32Z5EG16, SR32P6ES18, SR32P6EG18, SR32Z6ES18, SR32Z6EG18, SR32P5S16, SR32P5G16, SR32Z5S16, SR32Z5G16, 2RTT32P5ES16, 2RTT32P5EG16 [Shell 36] (14 models): SR36P6ES20, SR36P6EG20, SR36Z6ES20, SR36Z6EG20, SR36P7ES22, SR36P7EG22, SR36Z7ES22, SR36Z7EG22, SR36P6S20, SR36P6G20, SR36Z6S20, SR36Z6G20, 2RTT36P6ES20, 2RTT36P6EG20 [Shell 40] (14 models): SR40P7ES24, SR40P7EG24, SR40Z7ES24, SR40Z7EG24, SR40P8ES26, SR40P8EG26, SR40Z8ES26, SR40Z8EG26, SR40P7S24, SR40P7G24, SR40Z7S24, SR40Z7G24, 2RTT40P7ES24, 2RTT40P7EG24 [Shell 48] (12 models): SR48P8ES28, SR48P8EG28, SR48Z8ES28, SR48Z8EG28, SR48P9ES30, SR48P9EG30, SR48Z9ES30, SR48Z9EG30, SR48P8S28, SR48P8G28, 2RTT48P8ES28, 2RTT48P8EG28 [Shell 55] (10 models): SR55P9ES32, SR55P9EG32, SR55Z9ES32, SR55Z9EG32, SR55P10ES35, SR55P10EG35, SR55P9S32, SR55P9G32, 2RTT55P9ES32, 2RTT55P9EG32 [Shell 60] (10 models): SR60P10ES38, SR60P10EG38, SR60Z10ES38, SR60Z10EG38, SR60P11ES40, SR60P11EG40, SR60P10S38, SR60P10G38, 2RTT60P10ES38, 2RTT60P10EG38