Washers and serrated washers are not a specific brand but a category of industrial fasteners used in various applications. These components are produced by numerous manufacturers worldwide, including companies like Fastenal (USA), ITW Shakeproof (USA), and Nord-Lock (Sweden). They serve industries such as automotive, aerospace, construction, and machinery, providing solutions for vibration resistance, load distribution, and secure fastening. Common products include flat washers, lock washers, and serrated washers, which are essential for maintaining assembly integrity under dynamic conditions.