DIN25201防松墊圈 Independent agencies DNV ( Norway classification ) has been type approved NORD-LOCK lock washer. The certification process after more than two years, it also carried out a series of independent testing ( in accordance with DIN 65151standards for the vibration test and in accordance with NASM1312-7 standard acceleration vibration test ). In addition, NORD-LOCK production and quality assurance mechanism through a thorough investigation and research. General agent in China: clear super international trade limited company ( Dalian ) Tel: 86-0411-86647717 86657717 Fax:86-0411-86647718 Mobile phone:13304280955 Contact: Miss Liu Zhao E-mail: nordlock@126.com Web site: www.dlqck.com Address: Liaoning Province, Dalian city southwest of Shahekou District Road No. 931