OEM/ODM Series 223-Spherical Roller Bearings Company, Factory - Ningbo DHK Precision Bearing Co., Ltd.

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Series 223-Spherical Roller Bearings

Design Variants
Tolerance
Internal clearance

Normally spherical roller bearings are non- separable double-row radial bearings, produced in open design as standard. On request, DHK can also design and produce single row spherical roller bearings or split outer ring spherical roller bearings.

Depending on their size and series DHK spherical roller bearings are produced in several different design variations, different designs have different spherical roller design and are fitted with different cages.

Bearings of the design C have symmetric spherical rollers and centre loose rib are fitted with two pieces pressed steel cage as standard.

Bearings of the design MB have a centre flange, with asymmetrical rollers and two pieces inner ring riding and machined solid brass cages. This design is produced for the large spherical roller bearings as standard. Such bearings have higher speed capacity.

Bearings of the design CA don t have centre flange. They have symmetric spherical rollers and are fitted with one piece machined solid brass cage.

Bearings of the design MA have a loose centre guide ring. They have symmetric rollers, are fitted with one piece machined and outer ring riding solid brass cage. The bearings of this design are especially for use in vibrating applications.

The spherical roller bearings are also frequently used with tapered bores (i.e. taper 1:12) namely suffix K or the taper bore is 1:30 namely suffix K30 for series 240 and 241 as standard. Such bearings are very easy to mount. The facility of mounting these bearing types using adapter (H) and withdrawal sleeves (AH) enables mounting directly onto drawn or fine turned seats of shaft for applications where high running accuracy is not necessary.

Lubricating groove and holes DHK spherical roller bearings with the exception of series 213...are produced incorporating simple re-lubrication features as standard, e.g. a circumferential groove and lubricating holes in

the outer ring. These features are identified with the suffix W33.

Misalignment

Spherical roller bearings are optimum to compensate misalignments. The maximum permissible misalignment from their centre position ( ), is dependant upon bearing design, series and actual operating conditions. The following values are maximum permissible.

Bearingseries Maximum permissible misalignment

213 1

222 1.5

223 2

230 1.5

231 1.5

232 2.5

239 1.5

240 2

241 2.5

DHK spherical roller bearings are produced with normal tolerance class (PN) as standard. Values for the individual tolerance classes are listed in the tables of the chapter bearing data / tolerance page 8.

Tolerances for DHK spherical 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

For the internal clearance group of spherical roller bearings a distinction must be made between bearings with cylindrical or tapered bores.DHK spherical roller bearings are produced to each relevant normal clearance group CN as standard.DHK can also produce spherical roller bearings with larger radial clearance (groups C3, C4 or C5) or even reduced radial clearance (group C2) on order request. The values are confirmed to ISO5753. Detailed values of radial clearance groups are listed in the following tables.

Radial internal clearance of DHK spherical roller bearings Spherical roller bearings with cylindrical bore

Bore diameter
>	<=	C2 Min max	CN Min max	C3 Min max	C4 Min max	C5 Min max
-- 24		10 20	20 35	35 45	45 60	60 75
24 30		15 25	25 40	40 55	55 75	75 95
30 40		15 30	30 45	45 60	60 80	80 100
40 50		20 35	35 55	55 75	75 100	100 125
50 65		20 40	40 65	65 90	90 120	120 150
65 80		30 50	50 80	80 110	110 145	145 180
80 100		35 60	60 100	100 135	135 180	180 225
100 120		40 75	75 120	120 160	160 210	210 260
120 140		50 95	95 145	145 190	190 240	240 300
140 160		60 110	110 170	170 220	220 280	280 350
160 180		65 120	120 180	180 240	240 310	310 390
180 200		70 130	130 200	200 260	260 340	340 430
200 225		80 140	140 220	220 290	290 380	380 470
225 250		90 150	150 240	240 320	320 420	420 520
250 280		100 170	170 260	260 350	350 460	460 570
280 315		110 190	190 280	280 370	370 500	500 630
315 355		120 200	200 310	310 410	410 550	500 690
355 400		130 220	220 340	340 450	450 600	600 750
400 450		140 240	240 370	370 500	500 660	660 820
450 500		140 260	260 410	410 550	550 720	720 900
500 560		150 280	280 440	440 600	600 780	780 1000
560 630		170 310	310 480	480 650	650 850	850 1100
630 710		190 350	350 530	530 700	700 920	920 1190
710 800		210 390	390 580	580 770	770 1010	1010 1300
800 900		230 430	430 650	650 860	860 1120	1120 1440
900 1000		260 480	480 710	710 930	930 1220	1220 1570
1000 1120		290 530	530 780	780 1020	1020 1330	1330 1770
1120 1250		320 580	580 860	860 1120	1120 1460	1460 1870
1250 1400		350 640	640 950	950 1240	1240 1620	1620 2060
1400 1600		400 720	720 1060	1060 1380	1380 1800	1800 2300
1600 1800		450 810	810 1180	1180 1550	1550 2000	2000 2550

Spherical roller bearings with tapered bore

Bore diameter
>	<=	C2 Min max	CN Min max	C3 Min max	C4 Min max	C5 Min max
-- 24		15 25	25 35	35 45	45 60	60 75
24 30		20 30	30 40	40 55	55 75	75 95
30 40		25 35	35 50	50 65	65 85	85 105
40 50		30 45	45 60	60 80	80 100	100 130
50 65		40 55	55 75	75 95	95 120	120 160
65 80		50 70	70 95	95 120	120 150	150 200
80 100		55 80	80 110	110 140	140 180	180 230
100 120		65 100	100 135	135 170	170 220	220 280
120 140		80 120	120 160	160 200	200 260	260 330
140 160		90 130	130 180	180 230	230 300	300 380
160 180		100 140	140 200	200 260	260 340	340 430
180 200		110 160	160 220	220 290	290 370	370 470
200 225		120 180	180 250	250 320	320 410	410 520
225 250		140 200	200 270	270 350	350 450	450 570
250 280		150 220	220 300	300 390	390 490	490 620
280 315		170 240	240 330	330 430	430 540	540 680
315 355		170 270	270 360	360 470	470 590	590 740
355 400		210 300	300 400	400 520	520 650	650 820
400 450		230 330	330 440	440 570	570 720	720 910
450 500		260 370	370 490	490 630	630 790	790 1000
500 560		290 410	410 540	540 680	680 870	870 1100
560 630		320 460	460 600	600 760	760 980	980 1230
630 710		350 510	510 670	670 850	850 1090	1090 1360
710 800		390 570	570 750	750 960	960 1220	1220 1500
800 900		440 640	640 840	840 1070	1070 1370	1370 1690
900 1000		490 710	710 930	930 1190	1190 1520	1520 1860
1000 1120		530 770	770 1030	1030 1300	1300 1670	1670 2050
1120 1250		270 830	830 1120	1120 1420	1420 1830	1830 2250
1250 1400		620 910	910 1230	1230 1560	1560 2000	2000 2450
1400 1600		680 1000	1000 1350	1350 1720	1720 2200	2200 2700
1600 1800		750 1110	1110 1500	1500 1920	1920 2400	2400 2950

Model	Dimensions				Rated load		Extreme speed		Calculation factor				Weight
Model	d	D	B	r1,r2 min	Dynamic load	Static load	Grease lubrication	Oil lubrication	e	Y1	Y2	Yo	[kg]
22308c	40	90	33	1.5	140	145	4300	5600	0.4	1.6	2.5	2	1.1
22308ck	40	90	33	1.5	140	145	4300	5600	0.4	1.6	2.5	2	1.1
22309c	45	100	36	1.5	165	190	3800	5000	0.4	1.7	2.5	1.6	1.36
22309ck	45	100	36	1.5	165	190	3800	5000	0.4	1.7	2.5	1.6	1.36
22310c	50	110	40	2	190	220	3400	4500	0.4	1.7	2.5	1.6	1.82
22310ck	50	110	40	2	190	220	3400	4500	0.4	1.7	2.5	1.6	1.82
22311c	55	120	43	2	230	265	3000	4000	0.4	1.7	2.5	1.6	2.31
22311ck	55	120	43	2	230	265	3000	4000	0.4	1.7	2.5	1.6	2.31
22312c	60	130	46	2.1	270	320	2800	3800	0.4	1.7	2.5	1.7	2.93
22312ck	60	130	46	2.1	270	320	2800	3800	0.4	1.7	2.5	1.7	2.93
22313c	65	140	48	2.1	305	360	2800	3600	0.39	1.7	2.6	1.7	3.54
22313ck	65	140	48	2.1	305	360	2800	3600	0.39	1.7	2.6	1.7	3.54
22314c	70	150	51	2.1	325	375	2400	3200	0.38	1.8	2.6	1.7	4.19
22314ck	70	150	51	2.1	325	375	2400	3200	0.38	1.8	2.6	1.7	4.19
22315c	75	160	55	2.1	375	440	2200	3000	0.38	1.9	2.6	1.7	5.21
22315ck	75	160	55	2.1	375	440	2200	3000	0.38	1.9	2.6	1.7	5.21
22316c	80	170	58	2.1	410	500	1800	2400	0.35	1.9	0.9	1.8	6.2
22316ck	80	170	58	2.1	410	500	1800	2400	0.35	1.9	0.9	1.8	6.2
22317c	85	180	60	3	500	620	1800	2400	0.33	2	3	2	7.1
22317ck	85	180	60	3	500	620	1800	2400	0.33	2	3	2	7.1
22318c	90	190	64	3	510	620	1800	2400	0.36	1.9	2.8	1.8	8.44
22318ck	90	190	64	3	510	620	1800	2400	0.36	1.9	2.8	1.8	8.44
22319c	95	200	67	3	580	700	1700	2200	0.35	1.9	2.9	1.8	9.77
22319ck	95	200	67	3	580	700	1700	2200	0.35	1.9	2.9	1.8	9.77
22320c	100	215	73	3	730	960	1500	2000	0.33	2	3	2	12.6
22320ck	100	215	73	3	730	960	1500	2000	0.33	2	3	2	12.6
22322M	110	240	80	3	800	1060	1400	1900	0.37	1.8	2.7	1.8	17.5
22322K.MB	110	240	80	3	800	1060	1400	1900	0.37	1.8	2.7	1.8	17.5
22324M	120	260	86	3	900	1400	1300	1700	0.36	1.8	2.7	1.8	21.9
22324K.MB	120	260	86	3	900	1400	1300	1700	0.36	1.8	2.7	1.8	21.9
22326M	130	280	93	4	1040	1340	1200	1600	0.37	1.8	2.7	1.8	27.1
22326K.MB	130	280	93	4	1040	1340	1200	1600	0.37	1.8	2.7	1.8	27.1
22328M	140	300	102	4	1220	1600	1100	1400	0.38	1.7	2.6	1.7	34.1
22328K.MB	140	300	102	4	1220	1600	1100	1400	0.38	1.7	2.6	1.7	34.1
22330M	150	320	108	4	1370	1830	1100	1500	0.38	1.7	2.6	1.7	40.9
22330K.MB	150	320	108	4	1370	1830	1100	1500	0.38	1.7	2.6	1.7	40.9
22332M	160	340	114	4	1430	1900	1000	1300	0.37	1.8	2.7	1.8	51.1
22332K.MB	160	340	114	4	1430	1900	1000	1300	0.37	1.8	2.7	1.8	51.1
22334M	170	360	120	4	1600	2120	900	1200	0.37	1.8	2.7	1.8	59.7
22334K.MB	170	360	120	4	1600	2120	900	1200	0.37	1.8	2.7	1.8	59.7
22336M	180	380	126	4	1750	2360	850	1100	0.37	1.8	2.7	1.8	69.4
22336K.MB	180	380	126	4	1750	2360	850	1100	0.37	1.8	2.7	1.8	69.4
22338M	190	400	132	5	1860	2500	750	1000	0.37	1.8	2.7	1.8	81.2
22338K.MB	190	400	132	5	1860	2500	750	1000	0.37	1.8	2.7	1.8	81.2
22340M	200	420	138	5	1910	2750	670	900	0.36	1.8	2.8	1.8	91.8
22340K.MB	200	420	138	5	1910	2750	670	900	0.36	1.8	2.8	1.8	91.8
22344C	220	460	145	5	2380	3407	700	950	0.36	1.8	2.8	1.8	120
22344CK	220	460	145	5	2380	3407	700	950	0.36	1.8	2.8	1.8	120
22348M	240	500	155	5	2650	4000	560	750	0.31	2.2	3.3	2.2	151
22348K.MB	240	500	155	5	2650	4000	560	750	0.31	2.2	3.3	2.2	151
22352CK	260	540	165	6	3125	4560	600	800	0.36	1.8	2.8	1.8	187
22352CK	260	540	165	6	3125	4560	600	800	0.36	1.8	2.8	1.8	187
223560C	280	580	175	6	3530	5208	560	750	0.36	1.8	2.8	1.8	235
22356CK	280	580	175	6	3530	5208	560	750	0.36	1.8	2.8	1.8	235

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Industry Knowledge Expansion

1. Center Flange for Enhanced Stability

The incorporation of a center flange in Series 223-Spherical Roller Bearings represents a fundamental innovation aimed at elevating stability and optimizing load distribution. Stability lies at the heart of efficient bearing performance, especially in applications subject to high radial and axial loads. The center flange plays a pivotal role in maintaining precise alignment between the inner and outer rings, ensuring uniform contact between bearing elements. This alignment minimizes the risk of misalignment-induced stress concentrations, thereby enhancing the bearing's resistance to premature wear and fatigue failure. The center flange serves as a robust platform for the rollers, providing essential support and guidance as they navigate the demands of dynamic motion. By distributing loads more evenly across the bearing's components, this feature mitigates the risk of localized stress points, promoting smoother operation and extending the bearing's service life. In high-speed applications, where centrifugal forces can exacerbate the challenges of load distribution and stability, the center flange emerges as a critical safeguard against performance degradation. Its presence helps to counteract the disruptive effects of dynamic forces, allowing Series 223-Spherical Roller Bearings to maintain their operational integrity even at elevated speeds. The center flange facilitates ease of installation and maintenance, providing a reference point for aligning the bearing within the housing assembly. This feature streamlines the assembly process, reducing downtime and enhancing overall operational efficiency.

2. Innovative Design Features

At the core of Series 223-Spherical Roller Bearings lies a design philosophy that prioritizes innovation and functionality. This begins with the incorporation of a center flange, strategically positioned to enhance stability and promote uniform load distribution. By maintaining precise alignment, even under extreme conditions, this feature mitigates the risk of premature wear and ensures consistent performance over the bearing's lifespan. The asymmetrical rollers further underscore the innovative design of Series 223-Spherical Roller Bearings. Unlike conventional bearings with symmetrical rollers, this asymmetrical arrangement optimizes load distribution, reduces friction, and minimizes heat generation. As a result, these bearings exhibit enhanced efficiency and reliability, even in high-speed applications where dynamic loads are prevalent. The utilization of a two-piece inner ring riding on machined solid brass cages represents a significant advancement in bearing technology. This configuration not only improves alignment and reduces stress concentration but also enhances the bearing's ability to withstand heavy radial and axial loads. The machined solid brass cages add another layer of durability, ensuring reliable performance even in the harshest operating environments.

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What are the potential consequences of using improper or damaged rolling mill bearings in terms of safety and performance?

How do environmental factors, such as temperature and humidity, affect the performance of rolling mill bearings?

Are there any specific alignment requirements for screw compressor bearings to optimize performance and reduce wear?

What are the best practices for installing and mounting bearings in engineering machinery to ensure proper functionality?

What are the potential risks associated with over-lubrication or under-lubrication of motor bearings?

How do factors such as load capacity and rotational speed requirements influence the selection of bearings for different agricultural applications?

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Bearingseries	Maximum permissible misalignment
213	1
222	1.5
223	2
230	1.5
231	1.5
232	2.5
239	1.5
240	2
241	2.5

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Latest News

What are the potential consequences of using improper or damaged rolling mill bearings in terms of safety and performance?

How do environmental factors, such as temperature and humidity, affect the performance of rolling mill bearings?

Are there any specific alignment requirements for screw compressor bearings to optimize performance and reduce wear?

What are the best practices for installing and mounting bearings in engineering machinery to ensure proper functionality?

What are the potential risks associated with over-lubrication or under-lubrication of motor bearings?

How do factors such as load capacity and rotational speed requirements influence the selection of bearings for different agricultural applications?

Industry Knowledge Expansion

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