I. Product Function
1. Used together with bolts, nuts, and spring washers to increase the contact area between fasteners and workpieces, distribute clamping force, and prevent scratching of the workpiece surface during tightening;
2. Fills installation gaps, evenly distributes locking pressure, and protects the painted surface and anti-corrosion coating of flanges, steel structures, pipe supports, and equipment bases;
3. A universal cushioning washer for complete fastening systems used in composite pipe fittings, pressure vessels, ships, photovoltaic systems, and light steel workshops;
4. Compensates for oversized workpiece openings and uneven contact surfaces, improving the uniformity of flange sealing compression.
II. Specification and Standard Parameter Table
Parameter Item | Production Range / Optional Type |
Applicable Standard | GB/T 97.1, DIN 125, ISO 7089 |
Matching Bolt Size | M3–M64; inner diameter, outer diameter, and thickness are matched according to corresponding bolt specifications |
Forming Process | One-piece stamping from steel strip, with deburred edges |
Surface Treatment | Blue-white zinc electroplating, hot-dip galvanizing, black oxide treatment, stainless steel pickling and passivation |
Available Materials | Q235 low carbon steel, 304 stainless steel, 316L stainless steel |
Matching Combination | Used as a complete set with flat washers, spring washers, and hex nuts |
III. Material Application Scenarios
1. Q235 zinc-plated flat washers: economical and general-purpose, suitable for indoor dry workshops, normal-pressure water supply and drainage systems, and indoor photovoltaic supports;
2. Q235 hot-dip galvanized flat washers: suitable for outdoor steel structures, exposed photovoltaic supports, and long-term rust protection of outdoor pipelines;
3. 304 stainless steel flat washers: suitable for exposed freshwater pipelines, non-corrosive municipal pipelines, and general outdoor equipment;
4. 316L stainless steel flat washers: suitable for ocean-going vessels, seawater desalination, and salt-corrosion-resistant composite pipelines for desulfurization systems.
IV. Product Advantages
1. The flat circular ring structure increases the pressure-bearing contact area, preventing local stress from crushing the anti-corrosion layer of pipes or the flange sealing surface;
2. Stamped and formed without burrs, it will not scratch workpiece linings or painted surfaces during installation, making it suitable for lined composite pipelines and overlay-welded flanges;
3. Multiple anti-corrosion materials are available and can be matched with bolts and nuts of the same material to prevent galvanic corrosion caused by dissimilar metals;
4. Complete thickness specifications are available to adjust the preload stroke and adapt to steel structures and flange mounting surfaces with different flatness levels;
5. Compatible with a full range of fasteners, widely used in pipelines, pressure vessels, ships, and light steel construction projects, with complete supporting supply.