Hign-concerned Chemical : None Surface Roughness : Ra 0.05 Torque Capacity : Non-standard Structure : ECCENTRIC Model Number : 17287 17*28*7 mm Coatings : NICKEL Material : STEEL Brand Name : FUSHI Origin : Mainland China Certification : RoHS,None What is non-standard bearing? Non-standard bearings, is not in line with the national standards for the size of the bearings, also known as the overall size of the national standard is different from the provisions of all bearings. Its main features are low degree of versatility, many for special equipment, special occasions, small batch, new research and development equipment trial products accounted for the majority, but because of its not large-scale, batch production, production enterprises are not many, the cost is high, the price is more expensive. TECHNICAL SPECS Item: 17287 Inner Diameter: 17 mm Outer Diameter: 28 mm Thickness: 7 mm Grades: ABEC Grades 1 SPECIAL NOTE Dear friend, Please read this email before your purchase. You are about to buy non-standard bearings, Non-standard bearings The most important thing is to confirm that the dimensions meet your requirments, Our non-standard bearing sizes are marked in the picture.Please check! The type of seal is mainly 2RS, some will be different, maybe OPEN or ZZ, this can not be guaranteed. If the seal is important to you, please give us a message to confirm.