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Material
Nuts shall be made from a low-carbon steel which conforms to the following chemical composition requirements--Carbon: 0.47% max.; Phosphorus: 0.12% max.; Sulfur: 0.23% max.
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Proof Load
90, 000 psi.
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Plating
See Appendix-A for plating information.
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Hardness
Rockwell C28 maximum
Hex nut with two or three, round or rectangular indentations, compressed onto the flat sides of the nut equidistant from each other.The compressions create slightly distorted center threads resulting in a controlled locking action when the threads of the mating partbecome engaged.