单向轴承：BB15/BB17/BB20/BB25/BB30/BB35/BB40/ BB15-1K-K/BB17-1K-K/BB20-1K-K/BB25-1K-K/
BB30-1K-K/BB35-1K-K/BB40-1K-K/BB15-2K-K/BB17-2K-K/BB20-2K-K/BB25-2K-K/BB30-2K-K/BB35-2K-K/
BB40-2K-K/BB15-2GD/BB17-2GD/BB20-2GD/BB25-2GD/BB30-2GD/BB35-2GD/BB40-2GD/ BB15-2GD1K-K/BB17-2GD1K-K/
BB20-2GD1K-K/BB25-2GD1K-K/BB30-2GD1K-K/BB35-2GD1K-K/BB40-2GD1K-K/
