Plain Washers
- Home
- Exotic Metal Fasteners
- Plain Washers
Sunmach is a trusted Duplex Plain Washer manufacturer specializing in high-performance fastening components for demanding industrial applications. With over 13 years of manufacturing experience, we produce Duplex 2205 Plain Washers and Duplex Stainless Steel Washers in accordance with DIN 125, ISO 7089, and ANSI B18.22 Standards. Manufactured from certified UNS S32205 Duplex 2205 material, our washers provide superior load distribution, excellent chloride corrosion resistance, and outstanding mechanical strength. These Duplex 2205 Washers are widely used in offshore oil & gas, desalination, chemical processing, petrochemical, power generation, marine, aerospace, food processing, and heavy industrial applications where reliable bolted connections and long service life are essential. As an ISO 9001:2015 certified Duplex 2205 Plain Washer supplier, Sunmach combines advanced stamping, precision blanking, edge finishing, and in-house quality testing to manufacture washers with exceptional dimensional accuracy and consistent performance. Every Duplex Stainless Steel Plain Washer undergoes chemical composition verification, dimensional inspection, flatness testing, corrosion testing, and complete material traceability before dispatch. Available in Standard and custom sizes with optional passivation, special coatings, and sealing solutions, our Duplex 2205 Flat Washers are exported globally to the GCC, Southeast Asia, Europe, and North America, ensuring dependable performance in the world's most demanding industrial environments.
Plain Washers
Sunmach is one of the leading global manufacturer and supplier of Standard & Custom made Premium Nickel Alloys Plain Washers 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 Plain Washers 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 Plain Washers delivered dot in time to any corner of the world, supported by all required test certificates and with 100% traceability.
Nickel Alloy Plain Washers Specifications
Using Advanced Hot Forming Technology, Our Nickel Alloys Plain Washers 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 Plain Washers in both Imperial and metric sizes to accommodate diverse application needs. Our Nickel Alloys Plain Washers are specially engineered to withstand high temperature and high-pressure, ensuring superior strength and reliability.
Nickel Alloy Plain Washers 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 |
|---|---|---|---|---|
| Plain Washer | 931 | 4014 | B18.2.1 | 1364 |
Dimensions - Imperial
Dimensions - Metric
Frequently Asked Questions
Common questions about Sunmach Duplex Plain Washers
Standard flat washers made from traditional stainless steel lack the mechanical yield strength required for heavy-duty preloads and are highly vulnerable to localized Crevice Corrosion in stagnant seawater. Upgrading to Duplex 2205 Plain Washers provides nearly double the mechanical load-bearing capacity and outstanding resistance to chloride-induced pitting, ensuring critical bolted connections remain tightly sealed.
Offshore platforms and marine vessels require Duplex Stainless Steel Washers because standard alloys quickly degrade when exposed to salt spray and Harsh Marine environments. The dual-phase microstructure of duplex washers naturally resists crevice corrosion and stress corrosion cracking under dynamic wave loads, protecting structural joints from premature failure.
When high clamping forces are applied to a bolted assembly, Standard Washers can yield, dimple, or crush into softer mating materials, which causes a drop in bolt tension. Utilizing high-yield Duplex 2205 Flat Washers distributes the bolt's clamping force over a significantly wider bearing surface, preventing structural deformation and keeping the joint securely locked under dynamic vibrations.
A flat Duplex 2205 Washer is specified for static load distribution, surface protection, gap bridging, and galvanic isolation between dissimilar metals. Active spring or lock washers are utilized when a system requires continuous mechanical spring tension to combat extreme vibration, whereas flat washers focus on distributing high bolt preloads over a broad surface area.
Every premium batch of Duplex Plain Washers must be shipped with an EN 10204 3.1 Mill Test Certificate (MTC). This official documentation traces the washer directly back to the original steel melt, verifying its chemical purity, yield strength, and surface flatness, while non-destructive checks ensure the physical components are free from hidden defects.