This article was the joint effort of Larry Rudd and myself. Starting with the “Smart Nut” manufactured by Rod Grantham, we modified the idea a bit. It was written for those new to the metal working hobby.
The Angled Half Nut slides on a threaded rod yet locks securely when tightened. They are easy to make, just hard to design and analyze. Almost half of the article is analysis if you are a math geek.
If you are interested, please see
The warning on page 2 does present the limitations of this design:
"We do not recommend using the Angled Half Nut in applications involving safety.
It is designed for easy install and remove but does not have the strength of a full
nut. In a single test, a 3/8-16 Angled Half Nut machined into 1" thick 6061 failed
at a torque of 225 inch pounds. A 3/8-16 regular tapped hole in the same material
failed at 400 inch pounds."
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