CSK Bolts and Half Thread Studs undergo random crack checking and chemical composition checking. CSK Bolts and Half Thread Studs 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 CSK Bolts and Half Thread Studs undergo hardness test batch wise through calibrated hardness tester. These Bolts and Thread Studs are available in diameter ranging from 1/8" to 3".