OEM/ODM Series 230-Spherical Roller Bearings Company, Factory - Ningbo DHK Precision Bearing Co., Ltd.

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Series 230-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]
23022c	110	170	45	2	335	510	2200	3000	0.23	2.9	4.3	2.8	3.54
23022ck	110	170	45	2	335	510	2200	3000	0.23	2.9	4.3	2.8	3.54
23024c	120	180	46	2	360	570	2200	3000	0.22	3	4.5	3	3.86
23024ck	120	180	46	2	360	570	2200	3000	0.22	3	4.5	3	3.86
23026C	130	200	52	2	455	720	1900	2600	0.23	2.9	4.4	2.9	5.61
23026ck	130	200	52	2	455	720	1900	2600	0.23	2.9	4.4	2.9	5.61
23028C	140	210	53	2	480	780	1900	2600	0.22	3.1	4.6	3	6.04
23028CK	140	210	53	2	480	780	1900	2600	0.22	3.1	4.6	3	6.04
23030c	150	225	56	2.1	530	865	1800	2400	0.22	3.1	4.6	3	7.33
23030ck	150	225	56	2.1	530	865	1800	2400	0.22	3.1	4.6	3	7.33
23230c	150	270	96	3	1030	1610	1000	1300	0.38	1.8	2.7	1.7	24.5
23230ck	150	270	96	3	1030	1610	1000	1300	0.38	1.8	2.7	1.7	24.5
23032c	160	240	60	2.1	600	1000	1600	2000	0.22	3.1	4.6	3	8.9
23032ck	160	240	60	2.1	600	1000	1600	2000	0.22	3.1	4.6	3	8.9
23034C	170	260	67	2.1	735	1200	1500	1900	0.23	3	4.4	2.9	12.1
2304ck	170	260	67	2.1	735	1200	1500	1900	0.23	3	4.4	2.9	12.1
23036c	180	280	74	2.1	865	1430	1400	1800	0.23	2.9	4.3	2.8	15.8
23036ck	180	280	74	2.1	865	1430	1400	1800	0.23	2.9	4.3	2.8	15.8
23038c	190	290	75	2.1	915	1530	1300	1700	0.23	3	4.4	2.9	16.08
23038ck	190	290	75	2.1	915	1530	1300	1700	0.23	3	4.4	2.9	16.08
23040c	200	310	82	2.1	1060	1760	1300	1700	0.23	2.9	4.3	2.8	21.5
23040ck	200	310	82	2.1	1060	1760	1300	1700	0.23	2.9	4.3	2.8	21.5
23044MB	220	340	90	3	1100	2000	900	1200	0.26	2.6	3.8	2.5	31
23044K.MB	220	340	90	3	1100	2000	900	1200	0.26	2.6	3.8	2.5	31
23048K.MB	240	360	92	3	1160	2200	800	1000	0.25	2.7	4.1	2.7	33.9
23048MB	240	360	92	3	1160	2200	800	1000	0.25	2.7	4.1	2.7	33.9
23052k.MB	260	400	104	4	1500	2800	750	950	0.26	2.6	3.9	2.6	49
23052MB	260	400	104	4	1500	2800	750	950	0.26	2.6	3.9	2.6	49
23056K.MB	280	420	106	4	1560	3000	700	900	0.25	2.7	4.1	2.7	52.5
23056MB	280	420	106	4	1560	3000	700	900	0.25	2.7	4.1	2.7	52.5
23060MB	300	460	118	4	1960	3650	630	800	0.25	2.7	4	2.6	73.6
23064K.MB	320	480	121	4	2040	4000	600	750	0.25	2.7	4.1	2.7	79.5
23064MB	320	480	121	4	2040	4000	600	750	0.25	2.7	4.1	2.7	79.5
23068K.MB	340	520	133	5	2360	4500	560	700	0.25	2.7	4	2.6	105
23068MB	340	520	133	5	2360	4500	560	700	0.25	2.7	4	2.6	105
23072K.MB	360	540	134	5	2450	4800	530	670	0.25	2.7	4.1	2.7	111
23072MB	360	540	134	5	2450	4800	530	670	0.25	2.7	4.1	2.7	111
23076K.MB	380	560	135	5	2550	5300	500	630	0.25	2.8	4.2	2.8	117
23076MB	380	560	135	5	2550	5300	500	630	0.25	2.8	4.2	2.8	117
23080K.MB	400	600	148	5	3050	6200	450	560	0.24	2.8	4.1	2.7	152
23080MB	400	600	148	5	3050	6200	450	560	0.24	2.8	4.1	2.7	152
23084K.MB	420	620	150	5	3150	6550	450	560	0.24	2.8	4.2	2.8	160
23084MB	420	620	150	5	3150	6550	450	560	0.24	2.8	4.2	2.8	160
23088K.MB	440	650	157	6	3400	7100	430	530	0.24	2.8	4.2	2.8	184
23088MB	440	650	157	6	3400	7100	430	530	0.24	2.8	4.2	2.8	184
23092K.MB	460	680	163	6	2650	7650	400	500	0.24	2.8	4.2	2.8	210
23092MB	460	680	163	6	2650	7650	400	500	0.24	2.8	4.2	2.8	210
23096K.MB	480	700	165	6	3800	8150	380	480	0.23	2.9	4.3	2.8	220
23096MB	480	700	165	6	3800	8150	380	480	0.23	2.9	4.3	2.8	220
230/500K.MB	500	720	167	6	3900	8500	380	480	0.22	3	4.5	2.9	229
230/500MB	500	720	167	6	3900	8500	380	480	0.22	3	4.5	2.9	229
230/530MB	530	780	185	6	4400	9500	340	430	0.22	3	4.5	3	310
230/530K.MB	530	780	185	6	4400	9500	340	430	0.22	3	4.5	3	310
230/560K.MB	560	820	195	6	5100	11000	320	400	0.23	2.9	4.4	2.9	358
230560MB	560	820	195	6	5100	11000	320	400	0.23	2.9	4.4	2.9	358
230/600K.MB	600	870	200	6	5700	12500	300	380	0.22	3.1	4.6	3	406
230/600MB	600	870	200	6	5700	12500	300	380	0.22	3.1	4.6	3	406
230/630K.MB	630	920	212	7.5	6300	14000	260	340	0.31	2.2	3.3	2.2	661
230/630MB	630	920	212	7.5	6300	14000	260	340	0.31	2.2	3.3	2.2	661
230/670K.MB	670	980	230	7.5	7200	16000	260	340	0.22	3	4.5	2.9	602
230/670MB	670	980	230	7.5	7200	16000	260	340	0.22	3	4.5	2.9	602
230/710K.MB	710	1030	236	7.5	7650	17000	260	340	0.22	3.1	4.6	3	670
230/710MB	710	1030	236	7.5	7650	17000	260	340	0.2	3.1	4.6	3	670
230/750K.MB	750	1090	250	7.5	8500	19000	240	320	0.22	3	4.5	2.9	806
230/750MB	750	1090	250	7.5	8500	19000	240	320	0.22	3	4.5	2.9	806
230/800K.MB	800	1150	258	7.5	9300	21200	220	300	0.22	3.1	4.6	3	906
230/800MB	800	1150	258	7.5	9300	21200	220	300	0.22	3.1	4.6	3	906
230/900MBKMB	900	1280	280	7.5	11000	26500	200	280	0.22	3.1	4.7	3.1	1210
230/900MBKMB	900	1280	280	7.5	11000	26500	200	280	0.22	3.1	4.7	3.1	1210
230/1250CA/W33	1250	17500	375	9.5	17900	43400			0.19	3.6	5.3	3.6	2840

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Industry Knowledge Expansion

1. Robust Construction: One-Piece Machined Solid Brass Cage

A critical component of Series 230-Spherical Roller Bearings is their one-piece machined solid brass cage, which contributes significantly to their robust construction and exceptional performance in demanding operating environments. The choice of material and the manufacturing process employed in crafting these cages are paramount to their effectiveness in supporting the spherical rollers and maintaining their proper alignment under varying loads and conditions. Brass, renowned for its excellent strength, durability, and corrosion resistance, is the material of choice for the cages of Series 230 bearings. The use of solid brass ensures that the cage can withstand high operating temperatures, heavy loads, and harsh environmental conditions without compromising its structural integrity or performance. Unlike cages made from alternative materials, such as stamped steel or plastic, the solid brass construction provides superior resistance to deformation, fatigue, and wear, thereby extending the service life of the bearing assembly. The one-piece machined design of the brass cage further enhances its durability and reliability. Precision machining techniques are employed to fabricate the cage from a single piece of brass, eliminating seams, welds, or joints that could potentially weaken the structure or introduce points of failure. This seamless construction enhances the overall strength and integrity of the cage, ensuring optimal support and retention of the spherical rollers throughout the bearing's service life.

2. Optimal Load Distribution: Absence of Center Flange

The distinguishing feature of Series 230-Spherical Roller Bearings is the deliberate omission of a center flange, a design choice that significantly enhances the bearing's ability to distribute loads evenly and accommodate varying operating conditions. Unlike some traditional roller bearings that incorporate a center flange to retain the rollers, Series 230 bearings leverage a design that prioritizes optimal load distribution and operational flexibility. The absence of a center flange allows the rollers in Series 230 bearings to move freely along the raceways, adapting dynamically to changes in load and alignment. This freedom of movement is crucial for ensuring uniform stress distribution across the bearing components, thereby minimizing the risk of premature wear, fatigue, or failure. By eliminating the constraint imposed by a center flange, Series 230 bearings can effectively manage both radial and axial loads, maintaining stability and performance under diverse operating conditions. The absence of a center flange enhances the bearing's ability to accommodate misalignment between the shaft and housing. In real-world applications, misalignment can occur due to factors such as thermal expansion, shaft deflection, or mounting errors. Series 230 bearings excel in such scenarios, allowing the rollers to self-align within the bearing assembly, thereby reducing friction, minimizing stress concentrations, and extending the bearing's service life. The design simplicity resulting from the absence of a center flange contributes to the overall reliability and efficiency of Series 230 bearings. Without the need for additional components or complex structures associated with a center flange, these bearings boast a streamlined design that reduces the risk of assembly errors, simplifies maintenance procedures, and enhances overall system performance.

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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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