Hex Nuts
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Sunmach is a leading manufacturer and supplier of Duplex 2205 Hex Nuts, engineered for high-strength fastening in corrosive and demanding industrial environments. Manufactured from UNS S32205 / S31803 Duplex Stainless Steel, our Duplex 2205 Hex Nuts offer exceptional resistance to pitting, crevice corrosion and stress corrosion cracking while delivering nearly twice the strength of conventional 316L stainless steel. Produced in compliance with ISO 4034-1, DIN 934, ANSI B18.2.2 and ISO 9001:2015 quality Standards, our hex nuts are widely used in offshore oil & gas, desalination plants, petrochemical facilities, chemical processing, power generation, marine and water treatment industries. With over 13 years of manufacturing , Sunmach supplies precision-engineered Duplex Stainless Steel Hex Nuts to customers across the GCC, Europe, Southeast Asia and other global markets. Our Duplex 2205 Hex Nuts are manufactured using certified raw materials from globally recognized mills and undergo stringent quality inspections, including chemical composition verification (ICP/OES), precision thread rolling, solution annealing, hardness testing, corrosion testing (ASTM G48) and dimensional inspection to ensure reliable performance in critical applications. Available in metric and imperial sizes with coarse and fine thread options, these nuts provide superior load retention, vibration resistance and long-term durability in chloride-rich and high-pressure environments. Every batch is fully traceable and supplied with a Certificate of Conformance (CoC), making Sunmach a trusted partner for OEMs, EPC contractors and industrial projects requiring premium Duplex Hex Nuts, S32205 Hex Nuts and Duplex Stainless Steel Fasteners.
Hex Nuts
Sunmach is one of the leading global manufacturer and supplier of Standard & Custom made Premium Nickel Alloys 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 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 Hex Nuts delivered dot in time to any corner of the world, supported by all required test certificates and with 100% traceability.
Nickel Alloy Hex Nuts Specifications
Using Advanced Hot Forming Technology, Our Nickel Alloys Hex Nuts are manufactured in various specifications including DIN, ISO, ANSI and IS standard in nominal diameters ranging from 1/4” to 4” (M6 to M100). We provide Hex Nuts in both Imperial and metric sizes to accommodate diverse application needs. Our Nickel Alloys Hex Nuts are specially engineered to withstand high temperature and high-pressure, ensuring superior strength and reliability.
Nickel Alloy 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 M100 |
| Imperial : | 1/4" to 4" |
| MOQ : | 1 Piece & Above |
| Certification : | EN 10204 3.1, EN 10204 3.2 (On Demand) |
Specification
| Bolt | DIN | ISO | ANSI | IS |
|---|---|---|---|---|
| Hex Nut | 931 | 4014 | B18.2.1 | 1364 |
Dimensions - Imperial
Dimensions - Metric
Frequently Asked Questions
Common questions about Sunmach Duplex Hex Nuts
Duplex hex nuts are engineered for general-purpose to medium-heavy fastening in corrosive environments: offshore platform connections, desalination equipment, chemical reactors, power generation systems, petrochemical piping, aerospace/marine structures. Standard hex profile enables easy wrench application while Duplex 2205 provides superior seawater corrosion resistance. Ideal for 20–30 year service in chloride-rich environments without loosening or corrosion.
PRE value ~35 prevents pitting in high-chloride environments, ferrite phase provides stress-corrosion cracking (SCC) immunity where austenitic stainless fails catastrophically. Real-world validation: Duplex hex nuts in GCC desalination/offshore equipment (installed 1990s) show zero corrosion, SCC, or loosening after 25–30 years in seawater service, proof of permanent reliability.
Oil & Gas, Desalination, Chemical Processing, Petrochemical, Power Generation, Aerospace, Semiconductor, Pharmaceutical, Food & Beverage, Marine, Pulp & Paper, Water Treatment, Air Pollution Control. All require reliable, corrosion-resistant fastening where nut failure means equipment shutdown and safety risk.
Hex nuts: Standard compact profile, general-purpose fastening. Heavy hex: Larger across-flats, high-stress applications, superior load distribution. Cap nuts: Closed-end design, debris protection, aesthetic finishing. Flanged nuts: Integral washer face, load distribution, vibration damping. Choose hex for Standard fastening. Choose heavy hex for high-stress. Choose a cap for protection. Choose flanged for vibration/load distribution.