John Deere Original Equipment Socket Head Screw - M164280
This fits models: X300(PC9519, X300R(PC9608, X304(PC9520), 305R(PC10882), X310(PC10883), X320(PC9521), X324(PC9522), X360(PC9764), X500(PC9524), X530(PC10373), X534(PC9526), X540(PC9527), X590(PC9527).
Specification: Thread Size 0.394 IN, Thread Pitch 0.059 IN, Length 5.512 IN, Thread Length 1.969 IN, Drive Type HEXSOC, Head Diameter 0.630 IN, HeadHeight 0.394 IN, Material or Grade 4.8, Drive Size 0.315 IN, Finish B.
This is a genuine John Deere part. Thanks for looking!