O.N. Industries

O.N. Industries Co., Ltd. is a Japanese manufacturer of stainless steel piping components that celebrated its 60th anniversary in 2025. Its flagship Nice Joint line comprises expansion-type stainless steel pipe fittings for water supply, hot and cold water, air, steam, steam return, high-temperature water and fire-protection piping, including fire-law-certified earthquake-resistant joints and the next-generation Nice Joint X with improved workability and safety.

The company also produces threaded fittings, valves and stainless steel castings, operating its own casting foundry with complete quality management from casting through finishing and top-class Japanese casting and processing technology. RoHS-compliant products, ISO certification, environmental and social responsibility initiatives and a multilingual export operation round out the profile of this established piping materials specialist.