This spring washer from Volvo Penta, also known as a split lock washer, is a spherical helical spring metal washer meant to be placed beneath the head of a bolt or nut to keep it from vibrating loose. In other words, the springs within the washer provide pressure on the bolt and workpiece to secure them together. The black chromated surface of these steel washers offers additional protection and a sleek, professional appearance. Key features: Designed for long-term usage with great accuracy and efficiency It can be used for assembly, mechanical repair, and building tasks With the capacity to accommodate for dimensional variations in the assembly, maintain a consistent force, and prevent loosening, it has three functions: split, locking, and spring Specifications: Brand: Volvo Penta Manufacturer s Part Number: 994893 Inside Diameter: 8.4mm Outside Diameter: 15.0mm Thickness: 0.8mm Material: Steel Surface Treatment: Electro-zinc plated zinc-iron, black chromated Replaces Volvo: 9410907,330445, V422315, V190819V931907, V940907, V330445 Volvo Penta Exploded view / schematic Shaft Kit for Sea Water Pump,Belt Driven