Cylindrical roller bearing NU- 311 ( NU- 311 ECJ ) size 55mm x 120mm x 29mm. Makes: ( a ) NSK/ Japan. ( b ) SKF/ Germany/ Austria & ( c ) FAG/ Germany/ India as per bill of materials of RDSO specification No. RDSO/ PE/ SPEC/ TL/ 0054- 2003 ( Rev 0 ) Amndt- 2 for 4. 5 KW brushless alternator