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Single Row Cylindrical Roller Bearings

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Design Variants

Misalignment

Cage

Tolerance

Internal clearance

Single row cylindrical roller bearings are available in several basic designs that differ from each other in number and arrangement of their flanges, the most important design variants are shown below.

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N type bearings features two integral flanges on the inner ring and outer ring without flanges.

NU type bearings features two integral flanges on the outer ring and inner ring without flanges, N and NU type bearings belong to the Non-locating bearings, they are not able to accommodate any axial loads.

NJ type bearings features two integral flanges on the outer ring and one integral flange on the inner ring, this allows them to accommodate axial loads in one direction only.

NUP type bearings have two integral flanges on the outer ring, one integral flange on the inner ting and a loose rib, so it is locating bearing and can accept axial loads in either direction.

NJ type bearings used in conjunction with thrust collars can build a locating bearing, which can accept axial loads in either direction.

Single row cylindrical roller bearings are available in several basic designs that differ from each other in number and arrangement of their flanges, the most important design variants are shown below.

N type bearings features two integral flanges on the inner ring and outer ring without flanges.
NU type bearings features two integral flanges on the outer ring and inner ring without flanges, N and NU type bearings belong to the Non-locating bearings, they are not able to accommodate any axial loads.
NJ type bearings features two integral flanges on the outer ring and one integral flange on the inner ring, this allows them to accommodate axial loads in one direction only.
NUP type bearings have two integral flanges on the outer ring, one integral flange on the inner ting and a loose rib, so it is locating bearing and can accept axial loads in either direction.
NJ type bearings used in conjunction with thrust collars can build a locating bearing, which can accept axial loads in either direction.
DHK single row cylindrical roller bearings have the rolling elements with modified outer diameter and crowning inner ring raceway, which minimize edge loading stresses between the rollers and raceway.
For applications operating under normal conditions the misalignment must not exceed 4 angular minutes.
For applications where higher misalignment may occur, DHK also produce single row cylindrical roller bearings with special crowned inner ring raceways (suffix B) to enable higher misalignments during operation.
DHK single row cylindrical roller bearings are available with all kinds material and design variants of cage upon request.
The most important materials and design variants of DHK single row cylindrical roller bearing cages are shown below.
Reinforced polyamide cages:
TN normal design of polyamide cage features holding lips on both side of roller pocket.
TN1 These are the enforced design of TN type.
TN2 Features holding lips on one side of roller pockets.This make it can raise the wall thickness of the cage at no-holding lip side, and therefore raised the strength of the cages.
Pressed Steel Cage: JP, JP1
Solid brass cages
M (MA, MB): normal design, features cage cover and cage body, rivetted by the steel rivets.
M2 (MA2, MB2): features cage body with round rivetting heads on its self and cage cover.
M6(MA6, MB6): features cage body with square riveting heads on its self and cage cover.

DHK single row cylindrical roller bearings are produced to normal tolerance class (PN) as standard.

DHK also can provide these bearings with closer tolerance class such as P6 and P5, tolerance.

Detailed tolerance values are listed in the chapter of tolerance of radial bearings, page 8.

Tolerances for DHK single row cylindrical roller bearings (excluding tapered roller bearings)

All dimensions shown in (mm):

Tolerances in (um):

Inner Ring

PN/(Normal)

Nominal Bore diameter		Deviation dmp	Variation Vdp Series			Variation Vdmp	Taper bore 1:12 Deviation/ Variation
>	<=	△dmp	7．8．9	0．1	2．3．4	Vdmp	△dmp	△d1mp-dmp	Vdp
2.5 10		0 -8	10	8	6	6	+15 0	+15 0	10
10 18		0 -8	10	8	6	6	+18 0	+18 0	10
18 30		0 -10	13	10	8	8	+21 0	+21 0	13
30 50		0 -12	15	12	9	9	+25 0	+25 0	15
50 80		0 -15	19	19	11	11	+30 0	+30 0	19
80 120		0 -20	25	25	15	15	+35 0	+35 0	25
120 180		0 -25	31	31	19	19	+40 0	+40 0	31
180 250		0 -30	38	38	23	23	+46 0	+46 0	38
250 315		0 -35	44	44	26	26	+52 0	+52 0	44
315 400		0 -40	50	50	30	30	+57 0	+57 0	50
400 500		0 -45	56	56	34	34	+63 0	+63 0	56
500 630		0 -50	63	63	38	38	+70 0	+70 0
630 800		0 -75					+80 0	+80 0
800 1000		0 -100					+90 0	+90 0
1000 1250		0 -125					+105 0	+105 0
1250 1600		0 -160
1600 2000		0 -200

Outer ring

PN/(Normal)

Nominal Outer diameter		Deviation	Variation Vdp Series			Sealed bearing	Variation	Radial runout
>	<=	△Dmp	7．8．9	0．1	2．3．4	2 3 4	VDmp	Kea
6 18		0 -8	10	8	6	10	6	15
18 30		0 -9	12	9	7	12	7	15
30 50		0 -11	14	11	8	16	8	20
50 80		0 -13	16	13	10	20	10	25
80 120		0 -15	19	19	11	26	11	35
120 150		0 -18	23	23	14	30	14	40
150 180		0 -25	31	31	19	38	19	45
180 250		0 -30	38	38	23		23	50
250 315		0 -35	44	44	26		26	60
315 400		0 -40	50	50	30		30	70
400 500		0 -45	56	56	34		34	80
500 630		0 -50	63	63	38		38	100
630 800		0 -75	94	94	55		55	120
800 1000		0 -100	125	125	75		75	140
1000 1250		0 -125						160
1250 1600		0 -160						190
1600 2000		0 -200						220
2000 2500		0 -250						250

DHK single row cylindrical roller bearings are produced to normal tolerance class (PN) as standard.

DHK also can provide these bearings with closer tolerance class such as P6 and P5, tolerance.

Detailed tolerance values are listed in the chapter of tolerance of radial bearings, page 8.

Tolerances for DHK single row cylindrical roller bearings (excluding tapered roller bearings)

All dimensions shown in (mm):

Tolerances in (um):

Inner Ring

PN/(Normal)

Nominal Bore diameter		Deviation dmp	Variation Vdp Series			Variation Vdmp	Taper bore 1:12 Deviation/ Variation
>	<=	△dmp	7．8．9	0．1	2．3．4	Vdmp	△dmp	△d1mp-dmp	Vdp
2.5 10		0 -8	10	8	6	6	+15 0	+15 0	10
10 18		0 -8	10	8	6	6	+18 0	+18 0	10
18 30		0 -10	13	10	8	8	+21 0	+21 0	13
30 50		0 -12	15	12	9	9	+25 0	+25 0	15
50 80		0 -15	19	19	11	11	+30 0	+30 0	19
80 120		0 -20	25	25	15	15	+35 0	+35 0	25
120 180		0 -25	31	31	19	19	+40 0	+40 0	31
180 250		0 -30	38	38	23	23	+46 0	+46 0	38
250 315		0 -35	44	44	26	26	+52 0	+52 0	44
315 400		0 -40	50	50	30	30	+57 0	+57 0	50
400 500		0 -45	56	56	34	34	+63 0	+63 0	56
500 630		0 -50	63	63	38	38	+70 0	+70 0
630 800		0 -75					+80 0	+80 0
800 1000		0 -100					+90 0	+90 0
1000 1250		0 -125					+105 0	+105 0
1250 1600		0 -160
1600 2000		0 -200

Outer ring

PN/(Normal)

Nominal Outer diameter		Deviation	Variation Vdp Series			Sealed bearing	Variation	Radial runout
>	<=	△Dmp	7．8．9	0．1	2．3．4	2 3 4	VDmp	Kea
6 18		0 -8	10	8	6	10	6	15
18 30		0 -9	12	9	7	12	7	15
30 50		0 -11	14	11	8	16	8	20
50 80		0 -13	16	13	10	20	10	25
80 120		0 -15	19	19	11	26	11	35
120 150		0 -18	23	23	14	30	14	40
150 180		0 -25	31	31	19	38	19	45
180 250		0 -30	38	38	23		23	50
250 315		0 -35	44	44	26		26	60
315 400		0 -40	50	50	30		30	70
400 500		0 -45	56	56	34		34	80
500 630		0 -50	63	63	38		38	100
630 800		0 -75	94	94	55		55	120
800 1000		0 -100	125	125	75		75	140
1000 1250		0 -125						160
1250 1600		0 -160						190
1600 2000		0 -200						220
2000 2500		0 -250						250

Dimensions and Parameters

Inquiry	Bearing NO.	Dimension						Basic load ratings		Limiting speed(rpm )		Bearing Dimension				Oblique retaining ring		Weight
Inquiry	Bearing NO.	d	D	B	r1 r2 min	r3 r4 min	S ≈	Dynamic(Cr)	Static(Cor)	Grease	Oil	E	F	d1 ≈	D1 ≈	B2	B3	Bearing	Oblique retaining ring
	NU3220M	100	180	60.3	2.1	2.1	7	304	437	3200	3800	--	121	--	--	--	--	6.49	--
	N320E	100	215	47	3	3	3.5	380	425	2600	3200	191.5	--	139.6	--	--	--	7.7	--
	NU320E	100	215	47	3	3	3.5	380	425	2600	3200	--	127.5	--	181	--	--	7.7	--
	NJ320E	100	215	47	3	3	--	380	425	2600	3200	--	127.5	139.6	181	13	20.5	7.7	0.9
	NUP320E	100	215	47	3	3	--	380	425	2600	3200	--	127.5	139.6	181	--	--	7.7	--
	NU2320E	100	215	73	3	3	6.1	570	720	2600	3200	--	127.5	--	181	--	--	12	--
	NJ2320E	100	215	73	3	3	--	570	720	2600	3200	--	127.5	139.6	181	13	23.5	12	0.95
	NUP2320E	100	215	73	3	3	--	570	720	2600	3200	--	127.5	139.6	181	--	--	12	--
	N420M	100	250	58	4	4	5.7	440	490	2400	3000	211	--	153.5	--	--	--	15.8	--
	NU420M	100	250	58	4	4	5.7	440	490	2400	3000	--	139	--	197	--	--	15.8	--
	NJ420M	100	250	58	4	4	--	440	490	2400	3000	--	139	153.5	197	16	27	15.8	1.6
	NUP420M	100	250	58	4	4	--	440	490	2400	3000	--	139	153.5	197	--	--	15.8	--
	NU1021M	105	160	26	2	1.1	4.5	112	153	3800	4500	--	119.5	124.5	140.3	7	13.5	1.9	0.24
	N221E	105	190	36	2.1	2.1	1.4	260	320	3000	3600	171.5	--	134.7	--	--	--	4.1	--
	NU221E	105	190	36	2.1	2.1	1.4	260	320	3000	3600	--	125.5	--	163	--	--	4.1	--
	NJ221E	105	190	36	2.1	2.1	--	260	320	3000	3600	--	125.5	134.7	163	10	16	4.1	0.52
	NUP221E	105	190	36	2.1	2.1	--	260	320	3000	3600	--	125.5	134.7	163	--	--	4.1	--
	NU3221E	105	190	65.1	2.1	2.1	7	362	573	3000	3600	--	126.5	--	--	--	--	7.94	--
	N321E	105	225	49	3	3	3.4	335	380	3000	3600	195	--	147	--	--	--	9.1	--
	NU321E	105	225	49	3	3	3.4	335	380	2600	3200	--	135	--	183.8	--	--	9.1	--
	NJ321E	105	225	49	3	3	--	335	380	2600	3200	--	135	147	183.8	13	20.5	9.1	1
	NUP321E	105	225	49	3	3	--	335	380	2600	3200	--	135	147	183.8	--	--	9.1	--
	NU421M	105	260	60	4	4	5.7	490	540	2200	2800	--	144.5	--	206	--	--	17.5	--
	NJ421M	105	260	60	4	4	--	490	540	2200	2800	--	144.5	159.5	206	16	27	17.5	1.7
	NUP421M	105	260	60	4	4	--	490	540	2200	2800	--	144.5	159.5	206	--	--	17.5	--
	NU1022M	110	170	28	2	1.1	4.5	140	190	3600	4300	--	125	131	149	7	13.5	2.4	0.27
	N222E	110	200	38	2.1	2.1	1.4	290	365	2800	3400	180.5	--	141.6	--	--	--	4.9	--
	NU222E	110	200	38	2.1	2.1	--	290	365	2800	3400	--	132.5	--	172.4	--	--	4.9	--
	NJ222E	110	200	38	2.1	2.1	--	290	365	2800	3400	--	132.5	141.6	172.4	11	17	4.9	0.62
	NU2222E	110	200	53	2.1	2.1	4	380	520	2800	3400	--	132.5	--	172.4	--	--	6.7	--
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