NASCAR has suspended Kyle Busch's crew chief and tire changer for one race for violating the lug nut policy during the team's win at Kansas last weekend.
Adam Stevens was also fined $20,000 and placed on probation through the end of the year. Front tire changer Josh Leslie is on probation until Dec. 31.
NASCAR said after Saturday night's race that all teams had passed the inspection of lug nuts. It was not clear Wednesday what changed regarding Busch's winning car.
Lug nuts have been an issue in NASCAR since the series stopped policing whether teams were applying all five on each tire during pit stops. By using less than five, a team would have a faster pit stop and gain track position.
Tony Stewart complained the practice was dangerous, and NASCAR fined him $35,000 for his criticism. NASCAR then said it would check all cars for five lug nuts before and after each race.