Enhance the security of your fastening applications with our Internal Tooth Lockwasher. Crafted from durable steel and featuring a corrosion-resistant zinc finish coating, this 8mm outside diameter washer ensures reliable performance. With a thickness of .5mm and a precise hole size of M4, it's designed for metric systems. The 4.3mm inside diameter guarantees a snug fit, while its RoHS compliance underscores our commitment to environmental responsibility. Trust in this essential component for maintaining the integrity of your assemblies.