OEM/ODM Series 239-Spherical Roller Bearings Company, Factory - Ningbo DHK Precision Bearing Co., Ltd.

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Series 239-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]
23936MB	180	250	52	2	440	850	1200	1600	0.2	3.4	5.1	3.3	8.12
23936K,MB	180	250	52	2	440	850	1200	1600	0.2	3.4	5.1	3.3	8.12
23938MB	190	260	52	2	465	900	1100	1500	0.18	3.7	5.5	3.6	8.46
23938K.MB	190	260	52	2	465	900	1100	1500	0.18	3.7	5.5	3.6	8.46
23940MB	200	280	60	2.1	525	1020	1100	1400	0.2	3.4	5.1	3.3	11.5
23940K.MB	200	280	60	2.1	525	1020	1100	1400	0.2	3.4	5.1	3.3	11.5
23944MB	220	300	60	2.1	625	1344	1100	1500	0.18	3.8	5.6	3.7	13
23944K.MB	220	300	60	2.1	625	1344	1100	1500	0.18	3.8	5.6	3.7	13
23948K.MB	240	320	60	2.1	600	1170	1000	1300	0.17	4.1	6	4	14
23948MB	240	320	60	2.1	600	1170	1000	1300	0.17	4.1	6	4	14
23952K.MB	260	360	75	2.1	845	1604	850	1100	0.19	3.5	5.3	3.5	24
23952MB	260	360	75	2.1	845	1604	850	1100	0.19	3.5	5.3	3.5	24
23956K.MB	280	380	75	2.1	950	2000	900	1200	0.18	3.8	5.6	3.7	26
23956MB	280	380	75	2.1	950	2000	900	1200	0.18	3.8	5.6	3.7	26
23960K.MB	300	420	90	3	1175	2261	750	1000	0.2	3.4	5.1	3.3	40
23960MB	300	420	90	3	1960	2261	750	1000	0.2	3.4	5.1	3.3	40
23960K.MB	300	460	118	4	1960	3650	630	800	0.25	2.7	4	2.6	73.6
23964K.MB	320	440	90	3	1215	2409	670	900	0.19	3.6	5.4	3.5	42
23964MB	320	440	90	3	1215	2409	670	900	0.19	3.6	5.4	3.5	42
23968K.MB	340	460	90	3	1306	2691	630	850	0.189	3.8	5.7	3.8	45
23968MB	340	460	90	3	1306	2691	630	850	0.189	3.8	5.7	3.8	45
23972K.MB	360	480	90	3	1030	3200	560	700	0.17	4.1	6	4	47
23972MB	360	480	90	3	1030	3200	560	700	0.17	4.1	6	4	47
23976K.MB	380	520	106	4	1785	4000	630	850	0.19	3.6	5.3	3.5	70
23976MB	380	520	106	4	1785	4000	630	850	0.19	3.6	5.3	3.5	70
23980MB	400	540	106	4	1850	3990	600	800	0.18	3.7	5.5	3.6	72
23980K.MB	400	540	106	4	1850	3990	600	800	0.18	3.7	5.5	3.6	72
23984K.MB	420	560	106	4	1960	4130	600	800	0.18	3.8	5.7	3.8	75
23984MB	420	560	106	4	1960	4130	600	800	0.18	3.8	5.7	3.8	75
23988K.MB	440	600	118	4	2100	4690	560	750	0.18	3.7	5.5	3.6	102
23988MB	440	600	118	4	2100	4690	560	750	0.18	3.7	5.5	3.6	102
23992K.MB	460	620	118	4	2305	5036	530	700	0.18	3.8	5.7	3.8	105
23992MB	460	620	118	4	2305	5036	530	700	0.18	3.8	5.7	3.8	105
23996K.MB	480	560	128	5	2525	5500	450	600	0.18	3.8	5.6	3.7	128
23996MB	480	560	128	5	2525	5500	450	600	0.18	3.8	5.6	3.7	128
239/500K.MB	500	670	128	5	2500	6090	480	630	0.17	3.9	5.8	3.8	130
239/500MB	500	670	128	5	2500	6090	480	630	0.17	3.9	5.8	3.8	130
239/530MB	530	710	136	5	2980	6755	450	600	0.18	3.8	5.7	3.8	150
239/530K.MB	530	710	136	5	2980	6755	450	600	0.18	3.8	5.7	3.8	150
239/560K.MB	560	750	140	5	3100	7650	340	430	0.17	4	5.9	3.9	183
239/560MB	560	750	140	5	3100	7650	340	430	0.17	4	5.9	3.9	183
239/600K.MB	600	800	150	5	3450	8650	320	400	0.17	4	5.9	3.9	221
239/600MB	600	800	150	5	3450	8650	320	400	0.17	4	5.9	3.9	221
239/630K.MB	630	850	165	6	4290	9910	380	500	0.18	3.8	5.7	3.7	280
239/630MB	630	850	165	6	4290	9910	380	500	0.18	3.8	5.7	3.7	280
239/670K.MB	670	900	170	6	4300	10600	280	360	0.17	4	5.9	3.9	326
239/670MB	670	900	170	6	4300	10600	280	630	0.17	4	5.9	3.9	326
239/710K.MB	710	950	180	6	4800	12000	260	340	0.18	3.8	5.7	3.8	386
239/710MB	710	950	180	6	4800	12000	260	340	0.18	3.8	5.7	3.8	386
239/750K.MB	750	1000	185	6	5200	12900	260	340	0.17	4	5.9	3.9	437
239/750MB	750	1000	185	6	5200	12900	260	340	0.17	4	5.9	3.9	437
239/800K.MB	800	1060	195	6	5850	15000	240	320	0.17	4.1	6	4	506
239/800MB	800	1060	195	6	5850	15000	240	320	0.17	4.1	6	4	506
239/900K.MB	900	1180	200	6	6930	17120	280	360	0.16	4.3	6.4	4.2	605
239/900MB	900	1180	200	6	6930	17120	280	360	0.16	4.3	6.4	4.2	605
239/950MB	950	1250	224	7.5	7500	20000	190	260	0.16	4.2	6.3	4.1	776
239/950K.MB	950	1250	224	7.5	7500	20000	190	260	0.16	4.2	6.3	4.1	776
239/1000MB	1000	1320	236	7.5	8150	21600	180	240	0.16	4.2	6.3	4.1	921
239/1000K.MB	1000	1320	236	7.5	8150	21600	180	240	0.16	4.2	6.3	4.1	921
239/1060MB	1060	1400	250	7.5	9800	26000	170	220	0.17	4.1	6	4	1110
239/1060K.MB	1060	1400	250	7.5	9800	26000	170	220	0.17	4.1	6	4	1110
239/1120MB	1120	1460	250	7.5	10200	27500	160	200	0.16	4.3	6.4	4.2	1150
239/1120K.MB	1120	1460	250	7.5	10200	27500	160	200	0.16	4.3	6.4	4.2	1150
239/1180MB	1180	1540	272	7.5	11400	31000	150	190	0.17	4.1	6	4	1410
239/1180K.MB	1180	1540	272	7.5	11400	31000	150	190	0.17	4.1	6	4	1410

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Industry Knowledge Expansion

1. Understanding Series 239-Spherical Roller Bearings

One of the defining characteristics of Series 239-Spherical Roller Bearings is their unique construction. Comprising an inner ring with two raceways, an outer ring with a spherical raceway, and barrel-shaped rollers symmetrically positioned between the raceways, these bearings are adept at accommodating both radial and axial loads with remarkable efficiency. The symmetrical roller design ensures uniform distribution of forces across the bearing, minimizing stress concentrations and enhancing overall load-bearing capacity. The optimized internal geometry of Series 239-Spherical Roller Bearings plays a pivotal role in their performance and longevity. Through meticulous engineering and advanced manufacturing techniques, these bearings exhibit superior resistance to wear, fatigue, and deformation, even when subjected to prolonged periods of operation under extreme conditions. This inherent robustness not only extends the operational lifespan of the bearings but also contributes to the reliability and efficiency of the machinery in which they are employed. The design features of Series 239-Spherical Roller Bearings are meticulously crafted to meet the demands of modern industrial applications, where reliability, efficiency, and longevity are paramount. One key design feature of these bearings is their symmetrical roller arrangement. By evenly distributing the load between the rollers and raceways, Series 239-Spherical Roller Bearings can withstand both radial and axial loads with exceptional efficiency, ensuring smooth and reliable operation even in the most demanding environments. This symmetrical design also minimizes the risk of skewing or tilting under load, further enhancing the stability and performance of the bearing assembly.

2. Grease Lubrication,Oil Lubrication: Enhancing Reliability and Elevating Performance

One of the key advantages of grease lubrication is its ability to maintain a consistent lubricating film between the rolling elements and raceways, even under varying operating conditions. This ensures smooth and reliable operation of the bearing assembly, while also providing an additional layer of protection against contamination and moisture ingress. Grease lubrication offers superior sealing properties compared to oil lubrication, further enhancing the reliability and longevity of Series 239-Spherical Roller Bearings in demanding industrial environments. When implementing grease lubrication, selecting the appropriate grease type and replenishment intervals are critical considerations. By choosing a grease formulation tailored to the specific operating conditions and performance requirements of the application, engineers can optimize the performance and lifespan of Series 239-Spherical Roller Bearings, while also minimizing maintenance downtime and associated costs. One of the primary advantages of oil lubrication is its ability to dissipate heat effectively, making it ideal for applications with high operating speeds or heavy loads. By continuously supplying fresh lubricant to the bearing surfaces, oil lubrication helps maintain stable operating temperatures, thereby reducing the risk of overheating and thermal degradation of the lubricant and bearing components. Oil lubrication offers superior contamination control compared to grease lubrication, as it facilitates the removal of debris, moisture, and other contaminants from the bearing assembly. This not only extends the operational lifespan of Series 239-Spherical Roller Bearings but also reduces the risk of premature wear, fatigue, and failure, ensuring uninterrupted operation and maximum productivity in critical industrial applications.

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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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