Sonkit (Shanghai) Industry Technology Co., Ltd.

Sonkit manufactures high-performance metallic sealing rings — O-ring, C-ring, V-ring, U-ring, E-ring (W-seal) and Comma-ring types — for static flange sealing under vacuum, cryogenic and high-temperature conditions. Founded in 2010 (legal entity incorporated 2015) with RMB 1 million registered capital per the business registry — the company website states RMB 20 million — it operates a plant in Shanghai's Qingpu Industrial Park where over 80% of processing and inspection equipment is digitally controlled, and has developed its own weld-free thermoforming process plus tailor-made heat-treatment lines. Quality system is ISO 9001:2015 with in-house test labs. Service industries include oil and gas, nuclear, pumps and valves, semiconductor vacuum equipment, gas turbines, high-temperature sensors, chemicals and pressure piping; the company reports more than 2,000 customers. Average lead time around four weeks. The supplier states its seals are also used for UAV / eVTOL static flange sealing. Registered entity: Shanggu (Shanghai) Industrial Technology Co., Ltd. (USCC 91310112351079021C), incorporated 13 Aug 2015 — the 2010 above is the stated origin of the business, the legal entity dates from 2015.

Metal O-ring seals, C-ring seals, V-ring seals, U-ring seals, E-ring (W-seal) seals, Comma-ring seals; custom alloys and coatings; vacuum / cryogenic / high-temperature static flange sealing.