OEM/ODM Series 231-Spherical Roller Bearings Company, Factory - Ningbo DHK Precision Bearing Co., Ltd.

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Series 231-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]
23120MB	100	165	52	2	355	540	2000	3000	0.31	2.2	3.2	2.1	4.5
23120K.MB	100	165	52	2	355	540	2000	3000	0.31	2.2	3.2	2.1	4.5
23110c	100	180	60.3	2.1	495	720	1700	2200	0.22	2	3	2	7.34
23122MB	110	180	56	2	410	640	1800	2400	0.3	2.3	3.3	2.2	5.5
23122K.MB	110	180	56	2	410	640	1800	2400	0.3	2.3	3.3	2.2	5.5
23124MB	120	200	62	2	495	770	1700	2200	0.31	2.2	3.3	2.2	7.6
23124K.MB	120	200	62	2	495	770	1700	2200	0.31	2.2	3.3	2.2	7.6
23126MB	130	210	64	2	540	860	1500	2000	0.3	2.3	3.3	2.2	8.5
23126K.MB	130	210	64	2	540	860	1500	2000	0.3	2.3	3.3	2.2	8.5
23128MB	140	225	68	2.1	600	990	1400	1800	0.3	2.3	3.3	2.2	10.5
23128K.BM	140	225	68	2.1	600	990	1400	1800	0.3	2.3	3.3	2.2	10.5
23130MB	150	250	80	2.1	800	1320	1300	1700	0.32	2.1	3.2	2.1	16.3
23130K.MB	150	250	80	2.1	800	1320	1300	1700	0.32	2.1	3.2	2.1	16.3
23132MB	160	270	86	2.1	930	1510	1200	1600	0.32	2.1	3.2	2.1	20.5
23132K.BM	160	270	86	2.1	930	1510	1200	1600	0.32	2.1	3.2	2.1	20.5
23134MB	170	280	88	2.1	990	1650	1100	1500	0.31	2.2	3.2	2.1	22
23134K.MB	170	280	88	2.1	990	1650	1100	1500	0.31	2.2	3.2	2.1	22
23136c	180	300	96	3	1160	1940	1100	1400	0.32	2.1	3.1	2.1	28.4
23136ck	180	300	96	3	1160	1940	1100	1400	0.32	2.1	3.1	2.1	28.4
23138MB	190	320	104	3	1320	2290	1100	1400	0.33	2	3	2	35.6
23138K.MB	190	320	104	3	1320	2290	1100	1400	0.33	2	3	2	35.6
23140MB	200	340	112	3	1370	2460	1100	1400	0.35	1.9	2.9	1.9	43.5
23140K.MB	200	340	112	3	1370	2460	1100	1400	0.35	1.9	2.9	1.9	43.5
23144K.MB	220	370	120	4	1515	2509	1000	1300	0.3	2.3	3.4	2.2	52
23144MB	220	370	120	4	1515	2509	1000	1300	0.3	2.3	3.4	2.2	52
23148K.MB	240	400	128	4	1705	2863	900	1200	0.3	2.3	3.4	2.2	66
23148MB	240	400	128	4	1705	2863	900	1200	0.3	2.3	3.4	2.2	66
23152MB	260	440	144	4	2153	3673	850	1100	0.31	2.2	3.3	2.2	92.5
23156K.MB	280	460	146	5	2295	4050	750	1000	0.3	2.3	3.4	2.2	98.5
23156MB	280	460	146	5	2295	4050	750	1000	0.3	2.3	3.4	2.2	98.5
23160K.MB	300	500	160	5	2635	4485	700	950	0.3	2.3	3.4	2.2	129
23160MB	300	500	160	5	2635	4485	700	950	0.3	2.3	3.4	2.2	129
23164MB	320	540	176	5	3115	6000	530	670	0.34	2	3	1.9	165
23164K.MB	320	540	176	5	3115	6000	530	670	0.34	2	3	1.9	165
23168K.MB	340	580	190	5	3605	6409	630	850	0.31	2.2	3.2	2.2	212
23168MB	340	580	190	5	3605	6409	630	850	0.31	2.2	3.2	2.2	212
23172K.MB	360	600	192	5	3740	7010	600	800	0.33	2.3	3.4	2.2	220
23172MB	360	600	192	5	3740	7010	600	800	0.33	2.3	3.4	2.2	220
23176K.MB	380	620	194	5	3740	7540	560	750	0.3	2.3	3.4	2.2	240
23176MB	380	620	194	5	3740	7540	560	750	0.3	2.3	3.4	2.2	240
23180K.MB	400	650	200	6	4100	7730	530	700	0.28	2.4	3.6	2.5	265
23180MB	400	650	200	6	4100	7730	530	700	0.28	2.4	3.6	2.5	265
23184CK	420	700	224	6	4600	9000	500	670	0.33	2	3	2	363
23188C	440	720	226	6	5250	10000	500	670	0.3	2.3	3.4	2.2	360
23188CK	440	720	226	6	5250	10000	500	670	0.3	2.3	3.4	2.2	360
23192C	460	760	240	7.5	5760	11025	480	630	0.3	2.3	3.4	2.2	441
23192CK	460	760	240	7.5	5760	11025	480	630	0.3	2.3	3.4	2.2	441
23196C	480	790	248	7.5	5800	11800	450	600	0.3	2.3	3.4	2.2	485
23196CK	480	790	248	7.5	5800	11800	450	600	0.3	2.3	3.4	2.2	485
231/500K.MB	500	830	264	7.5	6550	13200	430	560	0.3	2.3	3.4	2.2	580
231/500MB	500	830	264	7.5	6550	13200	430	560	0.3	2.3	3.4	2.2	580
231/530K.MB	530	870	272	7.5	7625	15000	400	530	0.3	2.3	3.4	2.2	645
231/530MB	530	870	272	7.5	7625	15000	400	530	0.3	2.3	3.4	2.2	645
231/560K.MB	560	920	280	7.5	8294	16295	380	500	0.3	2.3	3.4	2.2	740
231/560MB	560	920	280	7.5	8294	16295	380	500	0.3	2.3	3.4	2.2	740
231/600MB	600	980	300	7.5	9000	19300	280	360	0.31	1.8	2.7	2.2	933
231/600K.MB	600	980	300	7.5	9000	19300	280	360	0.31	1.8	2.7	2.2	933

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Industry Knowledge Expansion

1. Enhanced Performance in Vibrating Applications

The demanding conditions of vibrating applications necessitate bearings capable of withstanding substantial dynamic loads and oscillations. Series 231-Spherical Roller Bearings rise to this challenge with aplomb, thanks to their specialized design features tailored to excel in such environments. By incorporating a loose center guide ring, these bearings exhibit heightened adaptability to the unpredictable movements associated with vibrating machinery. This feature enables them to accommodate misalignment more effectively, mitigating the risk of premature wear and damage caused by shaft deflection or oscillations. Consequently, Series 231-Spherical Roller Bearings demonstrate superior resilience in environments where traditional bearings may falter, ensuring uninterrupted operation and prolonged service life. The robust cage configuration, comprising a one-piece machined outer ring riding on a solid brass cage, further enhances the bearings' performance in vibrating applications. This sturdy construction not only provides structural integrity but also facilitates efficient load distribution, minimizing stress concentrations and optimizing the bearings' ability to withstand dynamic forces. As a result, Series 231-Spherical Roller Bearings offer enhanced stability and reliability, even in the face of intense vibration, thus bolstering the overall productivity and longevity of industrial machinery.

2. Versatile Application Spectrum

Series 231-Spherical Roller Bearings transcend industry boundaries, finding wide-ranging utility across an array of industrial sectors characterized by vibrating machinery and equipment. From heavy-duty mining and construction machinery to precision instrumentation and automotive systems, these bearings serve as linchpins in diverse applications where reliability and performance are paramount. In mining and construction, Series 231-Spherical Roller Bearings endure the rigors of rock-crushing, conveyor systems, and earthmoving equipment, providing robust support in high-impact environments. Similarly, in power generation facilities, where turbines and generators generate significant vibrations, these bearings ensure smooth operation and minimal downtime, thereby optimizing energy production. In aggregate processing plants, Series 231-Spherical Roller Bearings excel in crushers, screens, and vibrating feeders, where they absorb the vibrational forces generated during material handling processes. Their ability to accommodate both axial and radial loads makes them indispensable components in these applications, contributing to the seamless operation of machinery and the efficient processing of materials.

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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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Series 231-Spherical Roller Bearings

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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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