Apple Choice of IPhone Aluminum Said to Slow Down Output

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Apple Inc.’s iPhone 5 supply shortfall is being exacerbated by a quality-control crackdown at Foxconn Technology Group that’s designed to cut the number of devices shipped with nicks and scratches, according to a person familiar with the matter.

The scrapes, which sparked complaints with the iPhone’s debut last month, are due to Apple’s decision to use a type of aluminum that helps make the smartphone thinner and lighter. Senior Apple managers told executives at Foxconn near the end of September to tighten production standards, said the person, who asked not to be named because the matter was private.