inner ring:1722mm outer ring:2062mm width:100mm material: 42CrMo innner gear gear data: m=14 z=-123 x*m=-7 pressure angle:20 it can be widely used on the tower crane with Max.Revolving speed 0.08min as to the quality,our company treat it as the soul. each procedure is tracked and monitored and there are quality record and file for each piece of bearing in order to ensure the qualified rate to reach 100%. IDA Luoyang longda bearing CO.,LTD Tel: 86-379-64985493 Website: www.ldb-bearing.com Fax: 86-379-64924823 E-MAIL:ldb@ldb-bearing.com MSN:ldbearing8@hotmail.com Skype:ldb-bearing