Parallel thread. Washer thickness .95mm (1/32"). Kit contains 10 of each size, 1/8", 1/4", 3/8", 1/2", 5/8" and 3/4".
Please ensure you have checked the parts you are ordering are 100% correct for your application. Due to the fact all items are special ordered from Aeroflow returns will only be accepted if a product is sent out incorrectly or if it is a warranty issue.
For more information on how our ordering works please check here.