ON Industry Co., Ltd.

ON Industry Co., Ltd. (ONK) 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 certified under the Fire Services Act, usable for water supply, hot water, chilled and hot water, air, steam, steam return, high-temperature water, and fire protection piping with general stainless steel pipes, offering five strengths: strong, easy, eco-friendly, expansion type, and fast. The next-generation Nice Joint X pursues further workability and safety developed from field feedback.

The company also manufactures threaded fittings, valves, and stainless steel castings, maintaining its own foundry to ensure complete quality control from casting to finished product with top-class casting and processing technologies and state-of-the-art equipment. ONK products conform to the RoHS directive, and the company pursues environmental and social initiatives including carbon offsetting through forest J-Credits, health management certification, and recognition as a workplace supporting women's advancement and childcare.