We are the Roll-Fast leading manufacturers of Heavy Hex Bolt for the construction of Petrochemical Industries & general maintenance work on a daily basis. We offer Heavy Hex Bolts in different grades like 8, 10, 12, B7, B7M, B16, B8, 307A etc. We offer sizes from M10 to M100 or 1/2” to 4”. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.
What is Heavy Hex Bolts?
The Heavy hex bolt are same as standard bolts, main difference is width across flat & head thickness is larger than standard bolts. Heavy Hex Bolts are bolt fasteners with six-sided hexagon head and externally threaded full or partial body. Hexagonal head profile enables easy wrenching while putting enough torque to the bolting joint. Hex bolts are used with hex nuts or a tapped hole.
The Heavy Hex Bolts following EN 14399-4, DIN 6914, Dast 021, ASME B18.2.1, ASME B18.2.6, ASTM A490 is to use heavy structural system & flange for obtain the required strength and heavy jerk loading capacity of the threads within the nut. The heavy hex bolt assembly is used in both preloaded and non-preloaded applications and it can be argued that in the event of failure by thread plastic deformation the assembly still acts as a non-preloaded assembly. These assemblies are more sensitive to over-tightening during preloading and therefore require more site control. If severely over tightened during preloading the mode of failure by plastic deformation of the engaged thread of the bolt assembly offers little indication of impending failure.
These Heavy Hex Bolt are manufactured by us in Alloy Steel, carbon steel, stainless steel & Duplex Steel. Popular carbon steel grades include A 194 and A 320. Grades include B7, B7M, B16, B8, B8M, (Class 1 and 2), A2-50, A2-70, A2-80, SS 316, SS 316S 31 etc. The requirements for these are mentioned in the American standard A 194 and A 320.
Roll-fast manufactures world class Heavy Hex Bolt for use in petrochemical industry, these bolts are manufactured as per Indian, European and American standard in Coating like Plain, Black and Hot Dip Galvanised (HDG), Geomat, Zinc Flake, Zinc Electroplating, Xylon, PTFE, Non-Metallic coating etc. .
Heavy Hex Bolts are used with Hex Nuts to extensively in petrochemical projects for flange joints in high temperature pipelines and also on rigs and offshore platforms in various parts of the world. Some of the major grades and sizes manufactured are given below-