John Deere Original Equipment Bolt - 03M7221.
Specs -
(A)Thread Size(IN): 0.2362
(B)Thread Pitch(IN): 0.0394
(C)Length(IN): 0.6299
(D)Thread Length(IN): 0.4331
(E)Neck Depth(IN): 0.1181
(F)Head Diameter(IN): 0.5591
(G)Head Thickness(IN): 0.1417
(H)Material or Grade(ALPHA): 8.8000
(I)Finish(ALPHA): B - Zinc - Electro Plated.

This is a OEM John Deere Part.