Home > Industrial Equipment & Components > Bearing > Cylindrical Roller Bearing > NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller

NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller

NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller thumbnail-1
NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller thumbnail-2
NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller thumbnail-3
NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller photo-1
NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller photo-2
NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA, Cylindrical Roller photo-3
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Brand Name:
HPC or Natural or OEM
Place of Origin:
China
Model Number:
NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA
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Brand Name HPC or Natural or OEM
Place of Origin China
Model Number NU 1021 M N 221 EM NJ 221 EM NU 221 EM N 321 EM NJ 321 EM NU 321 EM NJ 421 M NU 421 M NUP 421 M NNU 4921 K M NA NN 3021 K M NA
Number of Row Single Row
Seals Type Open
Precision Rating P6
Outside Diameter 145, 260
Bore Size 1005, 105

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 Principal dimensions Basic load ratings Speed limits Weight Radius Dimensions
Part   number Bore Outer Width Dynamic Static Grease Oil

d D B C Co rpm Kg rs min r1s min F E

mm kN 1 min−1 mm mm
NU 1021 M 105 160 26 101,5 135,3 3800 4500 4 2 1,1 126,8
N 221 EM 105 190 36 210 256 3200 3800 4,04 2,1 2,1
126,8
NJ 221 EM 105 190 36 210 256 3200 3800 4,04 2,1 2,1 168,8
NU 221 EM 105 190 36 210 256 3200 3800 4,04 2,1 2,1 126,8
N 321 EM 105 225 49 354 408 2400 3000 9,09 3 3
195,0
NJ 321 EM 105 225 49 354 408 2400 3000 9,09 3 3 135,0
NU 321 EM 105 225 49 418 469 2400 3000 9,09 3 3 133,0
NJ 421 M 105 260 60 488 545 2200 2800 17,4 4 4 144,5
NU 421 M 105 260 60 488 545 2200 2800 17,4 4 4 144,5
NUP 421 M 105 260 60 488 545 2200 2800 2,31 4 4 144,5
NNU 4921   K M NA 105 145 40 118,0 231 3800 4500 2,000 1,1
118,0
NN 3021 K   M NA 105 160 41 192,0 310 3600 4300 2,810 2,0 6,5
146,0


Cylindrical roller bearings are manufactured in a number of designs as indicated below.The predominant

type being the single row roller. The roller and cage assembly are guided axially by the integral

flanges (ribs) on one of the bearing rings. This design facilitates ease of mounting and dismounting,

particularly where both races are an interference fit on their seatings. Roller bearings with flanges (ribs)

on one race only do not provide any end location. Various roller bearings with ribs on both races provide

axial location, and are capable of carrying light or intermittent axial loading. These patterns are of

the NJ, NUP and NJ+HJ types. If used for axial location and light axial loads, the contact between the

flanges (ribs) and the roller ends is that of a sliding bearing, not rolling bearing; therefore

lubrication is of paramount importance.

Alignment is much more critical than that of a ball bearing; as a general guide, this is limited to

approximately .003 radians. Double and multi-row bearings are also manufactured

- see NN and NNU series.

Dimensions in accordance with ISO 15-2011


Of these bearings, the NJ, NUP and NJH types can also carry light or intermittent thrust loads between the guide rib and the end of the rollers. Several arrangements of locating ribs are available, as illustrated. The choice between these types is usually decided by consideration of assembly procedure or machine clearances. The bearings utilizing machined bronze cages are suitable for high speed peration. The NN 30 and NN 30 K series are available in high precision tolerances and, due to their extreme rigidity, are particularly suited for use in machine tool spindles.

Typical suffixs used for cylindrical roller bearings:


E - Increased loading capacity

NA - Non-interchangeable components

M - Brass cage guided on the rollers

EM - Increased loading capacity and brass cage guided on the rollers

EMA - Increased loading capacity and brass cage guided on the outer ring.


Product Tags: NU 1021 M , N 221 EM , NJ 221 EM , NU 221 EM , N 321 EM , NJ 321 EM , NUP 421 M , NNU 4921 K M NA , NN 3021 K M NA

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Integration Trading (Xiamen) Co.,Ltd
Verified Business License
Business Type
Trading Company
Year Established
2018
Factory Size
1,000-3,000 square meters
Annual Export Value
US$10 Million - US$50 Million
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