Heavy Hex Nuts


We are the Roll-Fast leading manufacturers of Heavy Hex Nut for the construction of Petrochemical Industries & general maintenance work on a daily basis. We offer Heavy Hex Nut in different grades like 8, 10, 12, 2H, 2, 2HM, 7L, B16 etc. & we offer sizes from M10 to M100 or 1/2” to 4”. Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.

What is Heavy Hex Nut?

A Heavy hex nut is a type of fastener with a threaded hole. Heavy Hex Nuts are almost always used with a mating bolt to fasten multiple parts together. Heavy Hex Nuts are one of the most common nuts available and are used with anchors, bolts, screws, studs, threaded rods and on any other fastener that has machine screw threads. Hex is short form of hexagon, which means they have six sides.

These Heavy Hex Nuts 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 2, 2H, 2HM, 8, 8M, B8 (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 Nut for use in petrochemical industry, these Nuts 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 Nuts are used with Stud bolts 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 -


Material Type

Grade name


Alloy Steel

EN8, EN8Cr, EN18, EN19, 41cr, 41Cr4, 42CrMo4


Carbon Steel

Low, Medium, High


Mild Steel



Stainless steel

SS304, SS316, SS316L, SS310, SS310S, SS410, SS316L, SS316 S31


Duplex Steel

S31500, S32304, S32404, S31803, S32205, S32520, S32550, S32750



White brass, Alpha brass, Beta brass, Alpha- beta



1100, 3003, and 6061

Threads are standard right-hand and unified inch coarse series (UNC, Unified National Coarse) or Unified inch fine (UNF, Unified National Fine). Also metric thread with Right & Left-hand threaded Heavy hex nuts are also available.

To ensure full thread engagement with the hex nut, bolts/screws should be long enough to allow at least two full threads to extend beyond the nut face after tightening. Conversely, there should be two full threads exposed on the head side of the nut to make sure the nut can be properly tightened.


These Nuts are first cut as per weight requirement for and then the machining on both side with require height, we then do heat treatment on them in our factory using an advanced SQF sealed quench heat treatment furnace from DOWA Japan, the heat treatment furnace is SCADA controlled and provides 100% repeatability batch after batch. The heat treatment result is a perfect marten site after hardening and gives perfect results after tempering as per standard requirement. After heat treatment we complete the Tapping and then coating as per customer requirement and then final assembly.

We also manufacturers low carbon nuts in M10 to M100 & 1/2” to 4” in plain, zinc plated and hot dip galvanised finish, we are exporting these Nuts to many countries like USA, Europe and middle east. We also distribute and market the following products in alloy steel, carbon steel and stainless-steel grades for the following products in ASME B18.2.2, ASME B18.2.6, ASME B18.2.6M, Dast 021, DIN 14399-4 & DIN 6914.