Hy-Lok Corp DIN fittings based on standard DIN 3851 have been improved to comply with current standard requirements. They conform to installation standard SIO 8434 part 1 and DIN 2353 and all constituent parts are interchangeable with other brands. Hy-Lok Corp. has many years of experience in the manufacture of precision products which is in conjunction with stringent quality control from the starting material up to the finished component determines the quality of Hy-Lok Corp. fittings.