Page 118 - needle bearings

Machined ring needle roller bearings
NTN

Applied shaft Composition of
Bearing type diameter (mm) nominal bearing number Remarks

Type NK
NK 7 ʗ 10 T2

Tail code
П5ʙП12 Width
Inscribed circle
diameter
Type code

Type NK+IR NK24ʗ16Rʴ IR 20 ʷ 24 ʷ 16

Type code
Bore diameter
П5ʙП9 Outer diameter
Width

[Tail code] Bearing with tail code T2 uses a
R: Rib type polyamide resin cage and,
T2: Resin cage therefore, it shall be used at
allowable temperature 120˚C and,
Type NKʝR
under continuous running, at
Type MR NK
(Inch series) MR 10 18 12 100˚C and less.
П14ʙП165
Width code
Outer diameter code
MR Inscribed circle dia. code
П15.875ʙ Type code
П234.95

NKʝType R+IR
Type MR+MI NKɾɾRʴIR MR101812ʴ MIʵ 06 10 12
(Inch series)
П10ʙП150
Type code
Inscribed circle
dia. code
Outer diameter code
Width code

Bearing Tolerances Radial clearance and bearing fits
The dimensional accuracy, profile accuracy and NTN machined ring needle roller bearings (with inner
running accuracy of machined ring needle roller bearings ring) are all manufactured within the radial clearance
are specified in JIS B 1514 (Accuracy of Rolling range specified in Table 5.1 of Subsection 5.1 "Radial
Bearings). (Refer to Section 4 "Bearing Tolerances", Clearance in Bearings" (page A-30). Because of the
Table 4.3 on page A-26.) Although the accuracy of NTN narrow non-interchangeable clearance range, the
standard bearings conforms to JIS Class-0, NTN can also bearings shipped after adjusted to a specific non-
supply bearings conforming to JIS Class-6, -5 and -4. interchangeable clearance must be installed with the
Feel free to contact NTN for the further detail of these clearance remained unchanged.
bearings. The respective dimensional tolerances for shaft and
The dimensional tolerances for the roller inscribed housing bore sizes on/in which bearing with inner ring is
circle diameters (Fw) of bearing type NK, RNA and MR press-fitted are per Table 6,3 of 6.4 "Recommended
conform to ISO Tolerance Range Class-F6. Refer to this Bearing Fits" (page A-34) which specifies them
ISO Tolerance Class according to load characteristic, load magnitude, and
in selecting shaft diameter and radial clearance. shaft and housing bore sizes.The profile accuracy and

B-56