Heavy Hex Nuts
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Sunmach manufactures high-performance Duplex 2205 Heavy Hex Nuts (UNS S32205) designed for superior load distribution and exceptional vibration resistance in high-stress bolted connections. Standard hex nuts often provide insufficient bearing surface area, leading to localized stress, loosening under vibration and eventual joint failure. Sunmach’s duplex Heavy Hex Nuts feature a significantly larger head (approximately 1.5× Standard size) combined with the high strength and corrosion resistance of Duplex 2205 stainless steel, ensuring reliable long term clamping force. These heavy hex nuts are ideal for offshore platform flanges, pressure vessel assemblies, structural steel connections and desalination plant equipment where safety and durability are paramount. Manufactured using advanced hot forging, precision threading and in-house heat treatment, they deliver consistent performance and resist corrosion for 20–30+ years in aggressive marine and chemical environments.
Heavy Hex Nuts Overview
Sunmach is one of the leading global manufacturer and supplier of Standard & Custom made Premium Nickel Alloys Heavy Hex Nuts engineered for the most critical industrial applications. We are an ISO 9001:2015 certified company, demonstrating our commitment to rigorous quality standards and consistent product excellence to deliver the best of the Nickel Alloys & Special Steel Fasteners.
Nickel Alloys Heavy Hex Nuts are manufactured by us from a range of high-performance & exotic materials such as : Hastelloy® C-276, Hastelloy® C-22, Hastelloy® B-2, Monel® 400, Monel® K-500, Inconel® 600, Inconel® 625, Inconel® 718, Titanium Grade 2, Titanium Grade 5, Titanium Grade 7, Duplex S31803, Duplex S32205, Super Duplex S32750 to various Stainless Steel grades of SS 304L, SS 316L SS 310, SS 310H, SS 347H, etc followed by Special Stainless Steel Grades such as 904L Stainless Steel, UNS N08904, DIN EN1.4539 Nitronic® 50, Nitronic® 60, UNS S21800, DIN EN, 254 SMO, UNS S31254, DIN EN 1.454, A4-80 Stainless Steel etc.
Sunmach’s extensive manufacturing capabilities and In-Stock Genuine & Authentic Raw Material availability allows us to support demanding industrial requirements with durable, corrosion-resistant, heat resistant & reliable Nickel Alloys Heavy Hex Nuts delivered dot in time to any corner of the world, supported by all required test certificates and with 100% traceability.
Nickel Alloy Heavy Hex Nuts Specifications
Using Advanced Hot Forming Technology, Our Nickel Alloys Heavy Hex Nuts are manufactured in various specifications including DIN, ISO, ANSI and IS standard in nominal diameters ranging from 1/4” to 3” (M6 to M76). We provide Heavy Hex Nuts in both Imperial and metric sizes to accommodate diverse application needs. Our Nickel Alloys Heavy Hex Nuts are specially engineered to withstand high temperature and high-pressure, ensuring superior strength and reliability.
Nickel Alloy Heavy Hex Nuts Application Industries
Sunmach serves a diverse range of markets including Chemical Processing, Semiconductor, Power Generation, Aerospace, Oil & Gas, Pharmaceutical, Food & Beverage, Marine, Pulp & Paper, Petrochemical & Refining, Air Pollution Control and Water Treatment.
Sizes
| Metric : | M6 to M76 |
| Imperial : | 1/4" to 3" |
| MOQ : | 1 Piece & Above |
| Certification : | EN 10204 3.1, EN 10204 3.2 (On Demand) |
Specification
| Bolt | DIN | ISO | ANSI | IS |
|---|---|---|---|---|
| Heavy Hex Nut | 931 | 4014 | B18.2.1 | 1364 |
Dimensions - Imperial
Dimensions - Metric
Frequently Asked Questions
Common questions about Sunmach Stainless Steel Heavy Hex Nuts
They are primarily used in high-load, high-torque, and severely corrosive assemblies where standard nuts would strip, gall, or suffer rapid oxidation. Typical applications include marine vessel structures, seawater desalination plant piping, chemical reactor flanges, high-vibration industrial machinery, and structural bridge supports.
Standard hex nuts have smaller dimensions and less thread engagement, which can lead to wrench slippage, thread stripping, or head deformation under high torque. Stainless steel heavy hex nuts feature an enlarged hex profile that distributes clamping force more evenly and shields internal threads from seawater entry.
254 SMO is a super austenitic grade with a high pitting resistance equivalent and a yield strength of approximately 300 MPa, ensuring absolute corrosion immunity and high pressure-holding capacity for over 30 years of continuous service in warm, highly concentrated chloride streams.
Standard 316L is a molybdenum-enhanced stainless steel that is highly cost-effective for general industrial acids and mild chemical exposure. Super austenitic 904L is heavily alloyed with copper and nickel, making it the premier choice for aggressive reducing acids, such as hot sulfuric or phosphoric acids.
Stainless steel threads are prone to galling, a form of wear where sliding threads cold-weld under pressure, which can lock the joint prematurely or strip the threads completely. Utilizing Nitronic 60 or applying specialized passivation and lubricants ensures smooth thread engagement and repeatable torque transmission.