1.38 in Roller Dia. Crowned Stud Cam Follower;Plain Face Design/ END ITEM IDENTIFICATION: 4910-01-539-6129 OUTER MEMBER OUTSIDE DIAMETER: 1.380 INCHES NOMINAL OUTER MEMBER WIDTH: 0.380 INCHES NOMINAL PART NAME ASSIGNED BY CONTROLLING AGENCY: TRACK ROLLER SPECIAL FEATURES: STUD DIA IS 0.3130 IN (NOM);STUD LENGTH IS 0.625 IN (NOM);THREAD SIZE IS 0.3125 IN (NOM);THREAD LENGTH IS 0.450 IN (NOM);THREADS/INCH ARE 18;BEARING TYPE IS BALL MATERIAL: STEEL ROD END BODY MATERIAL: STEEL BODY SURFACE TREATMENT: ZINC ROD END BODY SURFACE TREATMENT: ZINC BODY STYLE DESIGNATOR: 39A CROWNED OUTER RING W/INSERT AND/OR LINER