OEM John Deere Piston Pin, p/n R51731. NSN 2805-01-117-1944. Also R125754. US Army Surplus. Coated with rust preventative, will need to be washed before assembly. Never been out of the box until today. , SPECS: AAQL Body Style Plain ends AASG Casehardening Indicator Not case hardened ABKV Outside Diameter 1.37500 inches nominal ABXV Bore Diameter 0.6880 inches nominal ADAQ Body Length 3.3200 inches nominal ANTP Bore Style Straight-thru bore MATT Material Steel 15338 GTBD28