iPad 2 and iPhone 4 may not be available in time to meet the demand of Apple’s customer in the second quarter of the year, due to a shortage of part and labor.

According to Digitimes, Foxconn, one of the main manufacturers for Apple, is facing a shortage in part and labor, which may influence the shipments of Apple products, including the popular iPhone 4 and iPad 2. Apple is expected to sell around 22 million iPhones in the second quarter, an 18% increase from 18.6 million sales in the first quarter of the year. As for iPad 2, which sold less than 5 million in the first quarter, Apple is aiming to supply 10 million units.

The cause of the part shortage has been identified with the recent earthquake and tsunami activities in Japan. Foxconn, who is going through a troublesome time with several employees committing suicide recently, is also facing lack of labor in their plants in Chengdu, China, adding doubts to already worried customers.

Although Foxconn stressed their experience in the past of arranging manpower to meet the clients demand, it failed to answer whether the shipments of the products will be delayed or not.