N 204 NJ 204 E NJ 204 EM NU 204 E NU 204 EM NUP 204 EM NUP 204 E NJ 2204 E NJ 2204 EM NU 2204 E NU 2204 EM NUP 2204 E NJ 304 EM NU 304 EM NUP 304 EM NJ 2304 EM NJ 2304 E NU 2304 EM NU 2304 E NUP 2304 EM Cylindrical Roller Bearings

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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
N 204	20	47	14	15,2	12,5	15000	18000	0,11	1	0,6		40,0
NJ 204 E	20	47	14	25,7	22,6	15000	18000	0,11	1	0,6	26,5
NJ 204 EM	20	47	14	25,7	22,6	15000	18000	0,11	1	0,6	26,5
NU 204 E	20	47	14	25,7	22,6	15000	18000	0,11	1	0,6	26,5
NU 204 EM	20	47	14	25,7	22,6	17000	20000	0,12	1	0,6	27,0
NUP 204 EM	20	47	14	25,7	22,6	15000	18000	0,11	1	0,6	26,5
NUP 204 E	20	47	14	25,7	22,6	15000	18000	0,11	1	0,6	26,5
NJ 2204 E	20	47	18	30,6	28,3	13000	16000	0,142	1	0,6	26,5
NJ 2204 EM	20	47	18	30,6	28,3	13000	16000	0,142	1	0,6	26,5
NU 2204 E	20	47	18	30,6	28,3	13000	16000	0,14	1	0,6	27,0
NU 2204 EM	20	47	18	30,5	28,2	13000	16000	0,137	1	0,6	26,5
NUP 2204 E	20	47	18	30,6	28,3	13000	16000	0,14	1	0,6	28,5
NJ 304 EM	20	52	15	31,7	26,9	12000	15000	0,14	1,1	0,6	28,5
NU 304 EM	20	52	15	31,7	26,9	12000	15000	0,14	1,1	0,6	28,5
NUP 304 EM	20	52	15	31,7	26,9	12000	15000	0,22	1,1	0,6	27,5
NJ 2304 EM	20	52	21	42	38,8	11000	14000	0,207	1,1	0,6	27,5
NJ 2304 E	20	52	21	42	38,8	11000	14000	0,207	1,1	0,6	27,5
NU 2304 EM	20	52	21	42	38,8	11000	14000	0,22	1,1	0,6	27,5
NU 2304 E	20	52	21	42	38,8	11000	14000	0,207	1,1	0,6	27,5
NUP 2304   EM	20	52	21	42	38,8	11000	14000	0,084	1,1	0,6	30,5

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 operation. 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.