Nuts with Diameter 3/8" to 13/4" undergo random crack checking and chemical composition checking. Nuts with Diameter 3/8" to 13/4" are manufactured by Udehra Fasteners Limited which is an ISO 9001:2000 accredited company.Udehra Fasteners Limited also manufactures precision nuts, bolts and studs under the brand name ULF. The Nuts with Diameter 3/8" to 13/4" undergo hardness test batch wise through calibrated hardness tester. The available varieties of these Nuts are castle, slotted, square, lock, wheel, flanged and nylock nuts.