Issue link: http://www.e-digitaleditions.com/i/206043
API Series Oil Field Chains API Series Oil Field Chains from Hitachi Hitachi API series Oil Field Chains are designed and built to provide maximum performance and reliability for oil field service. These exceptional chains possess the highest fatigue strength ratings and shock load resistance compared with any standard chain series we currently build. Engineering and Technical Specifications • • • • • • • • • • Solid bushings and rollers Ballized pitch holes Wide waist link plates Press fitted center link plates for multi-strand chains Patented high energy mechanical treatment for pins Shot peened rollers and bushings Unique "bushed" multi-strand connecting links Factory applied hot dipped wax type pre-lubricant Special 4-pitch riveted type offset links available Patented Stainless Steel blast for link plates Q American Petroleum Institute License Number 7F-0025 Bushed Type Multi-Strand Connecting Links Hitachi Multi-strand API Oil Field chain connecting pins possess unique bushed center plates. The bushing provides a press fit to the center plates that improves fatigue strength. These connecting links possess the same dynamic capacity as the base chain yet are easy to install in the field. Ball Drifted Link Plates After heat treatment, link plates on Hitachi API series Oil Field Chains are ball drifted to eliminate small imperfections and impart beneficial compressive residual stresses while improving fatigue strength providing greater reliable service life. 1