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【2】Size: M2-M64.
【3】Surface treatment: Galvanized/nickel/chromium, Blackened, Hot-dip galvanized, Dacromet.
【4】Packaging methods: Bagged, Boxed, Cardboard box, Pallet.
【5】Execution standards: GB, DIN, ISO, ANSI, JIS, etc.
【6】Optional services: Customize、OEM/ODM、Testing (salt spray testing,etc)
Hex washer, also known as flat washer, is widely used for load distribution, surface protection, and improving joint stability in mechanical assemblies, steel structures, and industrial equipment.
ZSD Screw specializes in manufacturing high-quality carbon steel flat washers designed for structural reinforcement and industrial fastening systems. By integrating in-house production with strict quality inspection procedures, ZSD Screw supplies international-standard washers to global customers, ensuring consistent performance and reliable load distribution.
Standard flat washer dimensions are manufactured according to DIN, ISO and ASTM standards. Custom drawings and samples are accepted.
Type: Flat Washer.
Inner Diameter Range: M2 – M64.
Outer Diameter: According to DIN / ISO / ASTM standards or custom drawing.
Thickness Range: According to standard specification or customer requirement.
Standard: DIN 125 / DIN 9021 / ISO 7089 / ISO 7093 / ASTM F844.
Tolerance: According to standard or customer drawing.
We supply flat washers in a wide range of materials including: Carbon Steel (Q235, 35#, 45#), Alloy Steel (40Cr), Stainless Steel (304, 316, 316L), Brass and Aluminum (on request)
Strength Grades: Flat washers are available to match bolt grades and structural requirements, ensuring compatible load-bearing performance and joint stability. Heat treatment is completed in-house when required to ensure stable mechanical properties and controlled hardness.
Surface Treatment: To improve corrosion resistance and service life, we offer the following surface finishes: Zinc plated (blue / white / yellow). Black oxide. Hot dip galvanized. Zinc flake coating. Phosphate. Dacromet. Special surface treatments are available according to customer requirements.
Applications: In mechanical equipment manufacturing, ZSD Screw carbon steel flat washers are widely used to distribute clamping force under bolt heads and nuts, reducing surface stress concentration and preventing material deformation. They are applied in machine frames, transmission systems, motors, pumps, compressors, and automated production equipment where consistent load distribution and joint stability are required under vibration and cyclic loading conditions.
In electronic equipment and industrial electronics, carbon steel flat washers are used in control cabinets, enclosures, mounting brackets, and structural supports to improve fastening stability and protect contact surfaces. Proper washer selection helps maintain fastening alignment and reduce the risk of loosening in precision assemblies and industrial control systems.
In the new energy sector, carbon steel flat washers from ZSD Screw are applied in photovoltaic mounting systems, solar support structures, inverter installations, battery racks, and energy storage assemblies. These applications require reliable load distribution and corrosion-resistant surface treatment to ensure stable structural performance under outdoor exposure and temperature variation.
In conventional and renewable power generation facilities, flat washers are used in generator assemblies, turbine systems, auxiliary equipment frames, pipeline supports, and structural connections. Even load distribution and stable fastening are essential to maintain structural integrity under thermal expansion, high load, and long-term vibration.
In the automotive and transportation industries, ZSD Screw carbon steel flat washers are applied in chassis assemblies, engine mounting systems, suspension components, and body structures. They assist in maintaining consistent preload and protecting mating surfaces, contributing to long-term durability under dynamic operating conditions.
In heavy industry and engineering equipment manufacturing, flat washers are widely used in construction machinery, mining equipment, lifting systems, steel structures, and large mechanical assemblies. In equipment such as cranes, excavators, conveyors, and processing systems, washers support stable load transfer and prevent localized surface damage under heavy static and impact loads. ZSD Screw provides flat washers designed to maintain fastening reliability and structural safety in demanding industrial environments.
Custom Fasteners Manufacturer: ZSD Screw specializes in manufacturing custom non-standard fasteners according to customer drawings and samples.We support: Special dimensions and tight tolerances. Special thread forms. High strength and special materials. Small batch and mass production. Our experienced engineers provide professional technical support from design to production.
Quality Control & Certifications: Quality is strictly controlled throughout the entire production process.Inspection includes: Raw material inspection. Dimensional measurement. Thread gauge inspection. Salt spray test. Torque test. Hardness testing. Tensile strength testing Certifications: ISO 9001. IATF 16949. EN standards. ASTM standards.
Why Choose ZSD Screw: More than 16 years manufacturing experience. Complete production process (cold heading, CNC machining, heat treatment) . Strong custom fastener capability. Stable quality and competitive factory price. The delivery time of the source factory is short and controllable. Professional technical services and long-term after-sales service.
Please send us your drawings or specifications. Our engineers will provide professional fastening solutions and quotations within 24 hours.
A: We are a certified source factory located in SuZhou, China, with 16+years of expertise. Unlike trading companies, we operate our own cold-heading and thread-rolling lines, offering you factory-direct pricing, total quality control, and transparent production timelines.
A: It represents the highest quality standard in the automotive industry. For you, this means Automotive-Grade precision, 100% batch traceability, and a "Zero Defect" management philosophy applied to every fastener we produce, regardless of your industry.
A: Absolutely. Customization is our core strength. Our engineering team works with CAD, SolidWorks, and 3D Step files. From specialized head types to complex multi-station parts, we provide a one-stop solution from rapid prototyping to mass production.
A: Beyond our IATF protocols, we utilize high-speed automated optical sorting machines. These systems inspect 100% of the batch for dimensional accuracy, thread integrity, and surface defects, ensuring we meet your strict PPM (Parts Per Million) requirements.
A: Yes. As an IATF-certified partner, we provide full PPAP Level 3 packages, including Control Plans, PFMEA, and ISIR. Every shipment is accompanied by a 3.1 or 3.2 Material Test Report to verify chemical and mechanical compliance.
A: For standard stock items, there is no MOQ—you can order by the box. For custom parts, the MOQ depends on the specifications. We offer free samples for quality evaluation (customer covers shipping), which can be fully refunded upon mass production orders.
A: Stock items are shipped within 24-72 hours. Standard production typically takes 20-30 days, while complex custom projects (including tooling) take 35-45 days. We provide a firm delivery commitment with every quotation.
A: Yes. We offer DDP services globally (USA, Europe, Southeast Asia, etc.). We handle all freight, customs clearance, and import duties, delivering the goods directly to your door so you can focus on your business without logistics headaches.