The 51807034, also known by TE internal number 3-1616360-0, is a 1/4 inch split lock washer. This component applies spring force to a fastener assembly to prevent loosening due to vibration or torque. The washer is compliant with environmental regulations including the EU RoHS Directive 2011/65/EU and the EU ELV Directive 2000/53/EC. It is also classified as Low Halogen, with less than 900 ppm of bromine, chlorine, fluorine, or iodine per homogenous material, and is free of BFR/CFR/PVC. These washers are critical for ensuring the reliability and security of bolted joints in a wide range of mechanical and electrical assemblies.