Types of Flat Washers
2026-03-18
Flat washer Gaskets can be classified according to material into two main categories: non-metallic gaskets made of asbestos, rubber, synthetic resins, and polytetrafluoroethylene; and metallic flat gaskets made of steel, aluminum, copper, and other metal components, which are characterized by their strength and the principles governing their performance. Metallic tensile components are soft in texture, corrosion-resistant, and cost-effective, but their performance varies with temperature and pressure. They are predominantly used for flange sealing in medium- and low-pressure vessels and pipelines under ambient or moderate temperatures. Semi-metallic flat gaskets combine the flexibility, compressibility, and low bolt-load-bearing capacity of non-metallic materials with the strength, resilience, and temperature resistance of metals, making them suitable for medium-temperature, medium-pressure applications.
Metal flat washers are suitable for harsh operating conditions such as high temperature, high pressure, and frequent load cycling. They are flat washers that increase the contact area between the screw and the machine. When removing the screw, they prevent damage to the machine surface caused by spring washers. During installation, the spring washer is placed between the flat washer and the nut, with the flat washer in direct contact with the machine surface.
Increase the contact area between the screw and the machine. When removing the screw, what role does the flat washer play in the fastener to prevent damage to the machine surface caused by the spring washer? During installation, both the spring washer and the flat washer must be used: the flat washer is placed directly against the machine surface, while the spring washer is positioned between the flat washer and the nut.
Basic industry knowledge: Flat washers are primarily manufactured by stamping steel plates and typically have a flat, circular shape. What role do flat washers play in fasteners? They feature a central hole, the dimensions of which are generally specified according to customer requirements.
Flat washers typically come in various shapes, including thin discs, lock washers for round nuts, and saddle-shaped washers used in automotive stampings, serving to prevent leakage, provide isolation, inhibit loosening, or distribute pressure. Such components are available in many materials and configurations to perform a wide range of similar functions. Due to limitations imposed by the materials and manufacturing processes of threaded fasteners, the bearing surfaces of bolts and other fasteners are relatively small; therefore, washers are employed to reduce contact pressure and protect the surfaces of the joined parts. To prevent loosening of bolted joints, spring washers, multi-tooth lock washers, lock washers for round nuts, as well as elastic washers in saddle, wave, and conical forms are used.
Flat Washer Manufacturing Processes: There are two primary manufacturing processes for flat washers: deburring and surface finishing. To remove burrs, the washers must be polished, subjected to abrasive treatment, or processed by other appropriate methods. Surface finishing involves applying a coating (thick) or electroplating (thin), as specified in the relevant standards. Bian Xiao believes that bolts (including screws and studs) and nuts—other fastener components—should also follow the same surface-finishing procedures. Although additional standards exist, some of them lack the level of detail found in the established specifications.
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Nantong Longyu Rail Equipment Co., Ltd.
Contact: General Manager Wu
Address: No. 1, Xinning West Road, Group 6, Ningtong Residence, Jiang’an Town, Rugao City, Jiangsu Province
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