The penalty cuts the team's lead in the owner standings to 28 points over the Joe Gibbs Racing No. 54 team. Crew chief Jeremy Bullins was fined $10,000 as part of the standard penalty for the infraction.
Penske Racing will not appeal.
"(We) had a spring retaining screw back out during Saturday’s Nationwide Series race, which resulted in the car’s front end being too low by 1/16th of an inch when presented for post race inspection," the team said in a statement. "The problem is being addressed internally to prevent it from happening again."
Although Penske Racing as an organization was on probation in the wake of the race-manipulation investigation that followed this month's Cup race at Richmond International Raceway, NASCAR typically only increases penalties when the infraction is similar to the one that brought on the probation.