SNUG Fasteners (SNG271) Forty (40) 3/8-16 Zinc Plated Serrated Flange Hex Lock Nuts
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There is a serrated edge to the flange, but it holds. Diesel engine equipment batteries are a good fit for them.
Once you crimp them into the material, the threads become standard or metric and can be tightened or loosened by rotating the bolt in the right direction, or the opposite. I hope this answers your question that these are not reverse threads. Many of these companies have been used by me on my car projects, and I recommend them very highly.
Selected User Reviews For SNUG Fasteners (SNG271) Forty (40) 3/8-16 Zinc Plated Serrated Flange Hex Lock Nuts
Despite their small size, they have a flange on the bottom and are a nice lock nut.
Product of high quality.
There is no need to use.
It works perfectly.
There's something about dees nuts that I like.
nuts are nice and heavy duty. The threads are cut well, so they are easy to install. There are no rounded edges on the hex the wrench fits on securely without breaking. In addition, the teeth are securely fastened to the bottom, so there's no worry that they may loosen. I had no corrosion issues with these nuts. It was a great purchase. I would highly recommend them.