Special Screws
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Sunmach is an ISO 9001:2015 certified global manufacturer specializing in custom and Standard Nickel Alloy Special Screws, heavy-duty Duplex Screws, and industrial-grade Stainless Steel Screws designed for high-stress, corrosive, and extreme thermal environments. Engineered to major international Standards (DIN, ISO, ANSI/ASME, IS), these fasteners are available in diameters ranging from 1/4” to 3” (Imperial) and M6 to M76 (Metric). Sunmach utilizes advanced hot forming technology to optimize the internal grain structure of exotic alloys, which significantly boosts fatigue resistance and prevents thread stripping. Additionally, the company integrates advanced engineering solutions such as precise thread-rolling and recommending Nitronic® 60 components or high-temperature lubricants to eliminate thread galling, a common cold-welding failure in stainless steel and nickel alloy assemblies. To guarantee maximum structural integrity for mission-critical machinery, Sunmach enforces an unyielding quality control protocol that ensures 100% material traceability from the raw material melt to the finished product. Every batch undergoes rigorous in-house laboratory testing (including hardness, tensile strength, and dimensional audits) and is dispatched with comprehensive EN 10204 3.1 Mill Test Certificates (MTC). Backed by a strategic global logistics network optimized for tight refinery shutdowns and urgent offshore maintenance timelines, these high-performance screws deliver reliable, long-life performance across demanding global sectors, including offshore oil and gas, aerospace propulsion, semiconductor fabrication, and hygiene-critical food or pharmaceutical processing lines.
Special Screws
Sunmach is one of the leading global manufacturer and supplier of Standard & Custom made Premium Nickel Alloys Special Screws 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 Special Screws 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 Special Screws delivered dot in time to any corner of the world, supported by all required test certificates and with 100% traceability.
Nickel Alloy Special Screws Specifications
Using Advanced Hot Forming Technology, Our Nickel Alloys Special Screws 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 Special Screws in both Imperial and metric sizes to accommodate diverse application needs. Our Nickel Alloys Special Screws are specially engineered to withstand high temperature and high-pressure, ensuring superior strength and reliability.
Nickel Alloy Special Screws 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 |
|---|---|---|---|---|
| Special Screw | 931 | 4014 | B18.2.1 | 1364 |
Frequently Asked Questions
Common questions about Sunmach Premium Nickel Alloy, Duplex, & Stainless Steel Screws
Thread galling is a cold-welding failure caused by severe friction between mating thread surfaces during installation. Sunmach eliminates this hazard through precision thread-rolling, recommending specialized alloys like Nitronic 60, and incorporating high-temperature industrial lubricants.
You should specify heavy-duty Duplex Screws when your machinery operates under extreme mechanical tension, heavy physical loads, or severe corrosive stress. Their dual-phase internal matrix provides up to double the structural yield strength, preventing micro-cracking and thread deformation.
Nickel Alloy Special Screws engineered from exotic alloys like Hastelloy, Monel, and Inconel deliver exceptional thermal stability and fatigue resistance, maintaining clamping tension across extreme temperatures and highly reactive chemical environments where standard steel would soften or decay.
Sunmach manufactures Stainless Steel Screws, duplex variants, and specialty fasteners in diameters ranging from 1/4 inch to 3 inches (imperial) and M6 to M76 (metric) in strict compliance with DIN, ISO, ANSI/ASME, and IS dimensions.
Every batch of Nickel Alloy Special Screws and standard variants undergoes rigorous hardness, tensile strength, and dimensional audits, arriving on-site with comprehensive EN 10204 3.1 Mill Test Certificates.