Note: Self tapping thread protectors have 1-2 threads molded-in to get them started. As nuts are turned onto threaded shaft, they self-tap the remaining distance creating a snug theaded fit.

H = Height
D = Washer Diameter
Unit of Measure


Thread Size

N/A 5/16 - 18

Acorn Hex Nut Size

N/A 1/2"


N/A .500"

Washer Diameter

N/A .625"

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