Hex Flange 1/2 - 20 x 1 1/2" Small Flange OD. Flange diameter is .715 to fit the hein joint so that the heim has a full range of movement. The wrench size for this bolt is 9/16". Used for the top birdcage to radius rod. Forged head and rolled threads. Thread length = 1" Min UTS 160
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