The "Grade DH" Heavy Hex Structural Nut is recommended for ASTM A-490 Structural Bolts (150,000 psi minimum tensile strength structural bolts, available only in plain finish) and for galvanized ASTM A-325 Bolts. Galvanized DH Nuts are lubricated to minimize galling. The lubricant contains a colored dye to provide an obvious contrast with a plain zinc galvanized nut. "Grade DH" Nuts are made from medium carbon steel and must be quenched and temper heat treated.
Grade DH3" Nuts are made from weathering steel (alloy steel with additions of copper, nickel and chromium) and are also heat treated.
KORREKT Tech Inc is a US based engineering firm with its international Head Quarter at San Ramon, California, United States. Its production unit located at Pune, specializes in the fields of Manufacturing, Industrial Design Consultancy, and Engineering Services and Solutions. The Pune Unit is registered as an independent Company under the name Korrekt Engineering Technology Private Limited.
Supported by a team of technically qualified and experienced professionals KORREKT has kept itself tuned to the emerging needs of the global market in general and India's economic boom in particular. Korrekt has diversified into more promising projects in the energy sector. It envisages an ambitious business expansion plan for launching a wide range of products and services related to high & low pressure equipments for petroleum oil edible oil, gas, chemical and distillery industries across the world.