IR inner ring is processed through heat treatment and precision machining, tolerance of dimension and geometric accuracy accords to the national standard. There is guiding chamfering at the two ends of the bearing race of the inner ring, which is convenient for installation. They are used for situation when the axis can not be processed with heat treatment and can not be treated as bearing race. When the needle rollers with inner ring and without ring are used together, normal working windage can be reached.

Inner ring tolerance of LR is more than IR, terminal facet is not grinded, the price is low and they are usually used together with needle roller bearing with pressed outer ring.
IR32X37X20
IR32X37X30
IR32X40X20
IR32X40X36
IR33X37X13
IR35X40X17
IR35X40X20
IR35X40X20.5
IR35X40X30
IR35X42X36
IR35X43X22
IR38X43X20
IR38X43X30
IR40X45X17
IR40X45X20
IR40X45X20.5
IR40X45X30
IR40X48X22
IR40X48X40
IR40X50X22
IR42X47X20
IR42X47X30
IR45X50X25
IR45X50X25.5
IR45X50X35
IR45X52X22
IR45X52X40
IR45X55X22
IR50X55X25
IR50X55X35
IR50X58X22
IR50X58X40
IR50X60X25
IR50X60X28
IR55X60X25
IR55X60X35
IR55X63X25
IR55X63X45
IR55X65X28
IR60X68X25
IR60X68X35
IR60X68X45
IR60X70X25
IR60X70X28
IR65X72X25
IR65X72X45
IR65X73X25
IR65X73X35
IR65X75X28
IR70X80X25
IR70X80X30
IR70X80X35
IR70X80X54
IR75X85X25
IR75X85X30
IR75X85X35
IR75X85X54
IR80X90X25
IR80X90X30
IR80X90X35
IR80X90X54
IR85X95X26
IR85X95X36
IR85X100X35
IR85X100X63
IR90X100X26
IR90X100X30
IR90X100X36
IR90X105X35
IR90X105X63
IR95X105X26
IR95x105x36
IR95X110X35
IR95X110X63
IR100X110X30
IR100X110X40
IR100X115X40
IR110X120X30
IR110X125X40
IR120X130X30
IR120X135X45
IR130X145X35
IR130X150X50
IR140X155X35
IR140X160X50
IR150X165X40
IR160X175X40
IR170X185X45
IR180X195X45
IR190X210X50
IR200X220X50
IR220X240X50
IR240X265X60
IR260X285X60
IR280X305X69
IR300X330X80
IR320x350x80
IR340x370x80
IR360x390x80
IR380x415x100