Customer Dependence Sources and Availability of Raw Materials We are largely dependent on light vehicle, medium- and heavy-duty vehicle and of f-highway original equipment  manufacturer customers. Ford Motor Company (Ford) was the only individual customer accounting for 10% or more of our  consolidated sales in 2014. As a percentage of total sales from operations, our sales to Ford were approximately 18% in  2014  and 18% in 2013 and 17% in 2012 and our sales to PACCAR, our second largest customer, were approximately 9% in 2014 and  8% in both 2013 and 2012. Hyundai Mobis, Tata Motors and Nissan Motor Corporation were our third, fourth and fifth lar gest  customers in 2014. Our 10 largest customers collectively accounted for approximately  55% of our sales in 2014. Loss of all or a substantial portion of our sales to Ford or other lar ge volume customers would have a significant adverse  effect on our financial results until such lost sales volume could be replaced and there is no assurance that any such lost volume  would be replaced. We continue to work to diversify our customer base and geographic footprint. We use a variety of raw materials in the production of our products, including steel and products containing steel, stainless  steel, forgings, castings and bearings. Other commodity purchases include aluminum, brass, copper and plastics.  These  materials are typically available from multiple qualified sources in quantities suf ficient for our needs. However , some of our  operations remain dependent on single sources for certain raw materials. While our suppliers have generally been able to support our needs, our operations may experience shortages and delays in  the supply of raw material from time to time, due to strong demand, capacity limitations, short lead times, production schedule  increases from our customers and other problems experienced by the suppliers.  A significant or prolonged shortage of critical  components from any of our suppliers could adversely impact our ability to meet our production schedules and to deliver our  products to our customers in a timely manner . Seasonality Backlog Competition Within each of our markets, we compete with a variety of independent suppliers and distributors, as well as with the in- house operations of certain OEMs. With a renewed focus on product innovation, we dif ferentiate ourselves through ef ficiency  and performance, reliability , materials and processes, sustainability and product extension. A substantial amount of the new business we are awarded by OEMs is granted well in advance of a program launch.  These  awards typically extend through the life of the given program.  This backlog of new business does not represent firm orders.  We  estimate future sales from new business using the projected volume under these programs. Our businesses are generally not seasonal. However, in the light vehicle market, our sales are closely related to the  production schedules of our OEM customers and those schedules have historically been weakest in the third quarter of the year  due to a large number of model year change-overs that occur during this period.  Additionally, third-quarter production  schedules in Europe are typically impacted by the summer vacation schedules and fourth-quarter production is af fected globally  by year-end holidays. 3