The filter thread size of Nikon AF-S DX NIKKOR 18-300mm F3.5-6.3G ED VR is 67mm.
Below are links to the filters that we recommend you to consider for your Nikon 18-300mm F3.5-6.3G ED VR:
Read our detailed Nikon AF-S DX NIKKOR 18-300mm F3.5-6.3G ED VR Review