For W nuts and nylon nuts it is used when it protrudes too much, although the price is higher than nylon nut, it fits within the desired dimensions and it was very good. Although it can be fastened tightly and smoothly, it is hard to loosen and feeling that it is moderately tensioned. It is also good to avoid rusting with stainless steel. It is better if you offer cheaply in several packs, except M6.
I wanted to perform a firm loosening prevention for fixing the propeller rotating at high speed such as radio control helicopter and multi-copter. Assembling the motor and the propeller, looseness was likely to occur with the designated nut. It becomes heavy when it is a double nut, and even if we use two thin nuts, thin nuts are not on the market so. I purchased a U nut for evaluation, but it is quite tight and tightened, and prevention of loosening is being attempted. I can not even pre-tighten with fingers at all. However, since it is soft with the material on the bolt side made of aluminum type, threads are scraped. It is unconfirmed what will happen if you detach the nut several times. For the moment, this is a nut that seems to be usable. Currently, long-term monitoring is in progress. Stainless steel is expensive, but good to make.