Takenaka products are playing vital roles in supporting social infrastructure such as bridges and highways, as well as petroleum plants and wind power stations where high degrees of durability and safety are required. We have earned the trust of our customers in Japan, of course, for our thorough quality management, and also from customers overseas. Our products are used in all nuclear power plants in Japan, meeting their high safety standards.Takenaka has established the ISO9001 quality assurance program, according the international quality assurance system; received JIS certification for nuts and bolts; and certification from the Minister for Land, Infrastructure and Transport for bolt sets for wind generated power equipment support. Takenaka’s Monozukuri ensures traceability through consistent in-house material procurement, heat treatment, machining, testing and inspection, and quality assurance. Steel stock information is stored with mill certificates, which record the manufacturing history, and is managed with proper identification. Mill certificates specify the steel stock supplier, manufacture date, chemical composition, mechanical properties, applicable standards, etc. To prove ourselves worthy of the trust in our products, we maintain a range of inspection and testing equipment. We also provide calibration records for all our testing and inspection equipment on request. The "Octagon-T mark" engraved on our products signifies that they have past all our tests, symbolizing Takenaka's uncompromisingly high quality standard.