LKM Lange Kunststoffmutter-Rohling zylindrisch LKM-Tr-12x3 LKM-Tr-12x6P3 LKM-Tr-16x4 LKM-Tr-16x8P4 LKM-Tr-20x4 LKM-Tr-20x8P4 LKM-Tr-24x5 LKM-Tr-30x12P6 LKM-Tr-30x6 LKM-Tr-36x6 LKM-Tr-40x7 LKM-Tr-50x8