OBT Could supply trailer leaf spring, semi truck fifth wheels, parts fruehauf trailer, braking system, parabolic leaf spring, truck leaf springs, trailer brake camshafts, etc semi trailer parts. Leaf spring features: 1.More than ten product lines with advanced equipments. 2.Conventional leaf spring 3.Z type leaf spring 4.Parabolic leaf spring 5.Yearly turnout is more than 100,000 MT. 6.Making different types of leaf spring including. 7.material SUP6, SUP7, SUP9, SUP9A, SUP10, SUP11 and SUP11A are available.