OEM/ODM Series 241-Spherical Roller Bearings Company, Factory - Ningbo DHK Precision Bearing Co., Ltd.

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Series 241-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]
24122c	110	180	69	2	550	900	1200	1600	0.35	1.9	2.9	1.9	6.85
24122ck30	110	180	69	2	550	900	1200	1600	0.35	1.9	2.9	1.9	6.85
24124c	120	200	80	2	630	1050	1000	1300	0.37	1.8	2.7	1.8	10
24124ck30	120	200	80	2	630	1050	1000	1300	0.37	1.8	2.7	1.8	10
24126c	130	210	80	2	650	1100	900	1200	0.34	2	2.9	1.9	10.6
24126ck30	130	210	80	2	650	1100	900	1200	0.34	2	2.9	1.9	10.6
24128c	140	225	85	2.1	740	1380	1100	1500	0.34	2	2.9	1.9	12.8
24128ck30	140	225	85	2.1	740	1380	1100	1500	0.34	2	2.9	1.9	12.8
24130c	150	250	100	2.1	915	1560	1100	1500	0.4	1.7	2.5	1.6	19.9
24130ck30	150	250	100	2.1	915	1560	1100	1500	0.4	1.7	2.5	1.6	19.9
24132c	160	270	109	2.1	1060	1800	1000	1400	0.41	1.7	2.5	1.6	25.4
24132ck30	160	270	109	2.1	1060	1800	1000	1400	0.41	1.7	2.5	1.6	25.4
24134c	170	280	109	2.1	1060	1830	750	1000	0.39	1.7	2.6	1.7	26.4
24134ck30	170	280	109	2.1	1060	1830	750	1000	0.39	1.7	2.6	1.7	26.4
24136c	180	300	118	3	1460	2590	700	950	0.4	1.7	2.5	1.6	33.8
24136ck30	180	300	118	3	1460	2590	700	950	0.4	1.7	2.5	1.6	33.8
24138c	190	320	128	3	1400	2500	670	900	0.41	1.7	2.5	1.6	41.9
24138ck30	190	340	128	3	1400	2500	670	900	0.41	1.7	2.5	1.6	41.9
24140c	200	340	140	3	1770	3000	800	1100	0.35	2	2.9	1.9	52.5
24140ck3	200	340	140	3	1770	3000	800	1100	0.35	2	2.9	1.9	52.5
24144MB	220	370	150	4	1900	2450	700	900	0.41	1.6	2.4	1.6	65.5
24144K30.MB	220	370	150	4	1900	2450	700	900	0.41	1.6	2.4	1.6	65.5
24148MB	240	400	160	4	1780	3109	530	700	0.41	1.7	2.5	1.6	79.5
24148K30.MB	240	400	160	4	1780	3109	530	700	0.41	1.7	2.5	1.6	79.5
24152MB	260	440	180	4	2500	5100	480	630	0.42	1.6	2.4	1.6	110
24152K30.MB	260	440	180	4	2500	5100	480	630	0.42	1.6	2.4	1.6	110
24152K.MB	260	440	144	4	2153	3673	850	1100	0.31	2.2	3.3	2.2	92.5
24156MB	280	460	180	5	2635	4848	400	530	0.39	1.7	2.5	1.7	118
24156K30.MB	280	460	180	5	2635	4848	400	530	0.39	1.7	2.5	1.7	118
24160MB	300	500	200	5	3213	6011	430	560	0.4	1.7	2.5	1.6	159
24160K30.MB	300	500	200	5	3213	6011	430	560	0.4	1.7	2.5	1.6	159
24164MB	320	540	218	5	3750	7300	400	530	0.41	1.7	2.5	1.6	215
24164K30.MB	320	540	218	5	3750	7300	400	530	0.41	1.7	2.5	1.6	215
24168MB	340	580	243	5	4400	8500	450	560	0.43	1.6	2.3	1.5	266
24168K30.MB	340	580	243	5	4400	8500	450	560	0.43	1.6	2.3	1.5	266
24172MB	360	600	243	5	4500	9000	430	530	0.41	1.6	2.4	1.6	278
24172K30.MB	360	600	243	5	4500	9000	430	530	0.41	1.6	2.4	1.6	278
24176MB	380	620	243	5	4650	9500	400	500	0.39	1.7	2.5	1.7	290
24176K30.MB	380	620	243	5	4650	9500	400	500	0.39	1.7	2.5	1.7	290
24180MB	400	650	250	6	5100	10400	380	480	0.39	1.7	2.6	1.7	326
24180K30.MB	400	650	250	6	5100	10400	380	480	0.39	1.7	2.6	1.7	326
24184C	420	700	224	6	4600	9000	500	670	0.33	2	3	2	363
24184MB	420	700	280	6	6200	12700	400	500	0.33	2	3	2	443
24184K30.MB	420	700	280	6	6200	12700	400	500	0.33	2	3	2	443
24188MB	440	720	280	6	6400	13200	340	430	0.38	1.8	2.6	1.7	454
24188K30.MB	440	720	280	6	6400	13200	340	430	0.38	1.8	2.6	1.7	454
24192MB	460	760	300	7.5	7500	15600	320	400	0.39	1.7	2.6	1.7	578
24192K30.MB	460	760	300	7.5	7500	15600	320	400	0.39	1.7	2.6	1.7	578
24196MB	480	790	308	7.5	8000	16600	320	400	0.39	1.8	2.6	1.7	639
24196K30.MB	480	790	308	7.5	8000	16600	320	400	0.39	1.8	2.6	1.7	639
241/500MB	500	830	325	7.5	8650	18300	300	380	0.39	1.7	2.6	1.7	753
241/500K30.MB	500	830	325	7.5	8650	18300	300	380	0.39	1.7	2.6	1.7	753
241/530MB	530	870	335	7.5	9500	20000	280	360	0.38	1.8	2.6	1.7	838
241/530K30.MB	530	870	335	7.5	9500	20000	280	360	0.38	1.8	2.6	1.7	838
241/560MB	560	920	355	7.5	10600	22400	260	340	0.38	1.8	2.6	1.7	979
241/560K30.MB	560	920	355	7.5	10600	22400	260	340	0.38	1.8	2.6	1.7	979
241/600MB	600	980	375	7.5	11600	26000	240	320	0.38	1.8	2.7	1.8	1180
241/600K30.MB	600	980	375	7.5	11600	26000	240	320	0.38	1.8	2.7	1.8	1180
241/630MB	630	1030	400	7.5	12900	29000	240	320	0.38	1.8	2.7	1.7	1410
241/630K30.MB	630	1030	400	7.5	12900	29000	240	320	0.38	1.8	2.7	1.7	1410
241/670MB	670	1090	412	7.5	14000	31500	220	300	0.37	1.8	2.7	1.8	1610
241/670K30.MB	670	1090	412	7.5	14000	31500	220	300	0.37	1.8	2.7	1.8	1610
241/710MB	710	1150	438	9.5	15600	35500	200	280	0.38	1.8	2.7	1.8	1910
241/710K30.MB	710	1150	438	9.5	15600	35500	200	280	0.38	1.8	2.7	1.8	1910

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Industry Knowledge Expansion

1. Understanding Series 241 Spherical Roller Bearings

Series 241 Spherical Roller Bearings are a pivotal component in machinery where rotational motion is essential. Unlike traditional ball bearings, which are primarily designed for radial loads, spherical roller bearings excel in applications where heavy radial loads and moderate axial loads are present. The unique design of these bearings incorporates barrel-shaped rollers, which distribute the load more evenly across the rolling elements, resulting in enhanced load-carrying capacity and reduced stress on the bearing components. These bearings are aptly named for their spherical shape, allowing them to accommodate shaft misalignment without inducing excessive internal stress. This self-aligning capability is particularly beneficial in applications where shaft deflection or misalignment is unavoidable, such as in vibrating machinery or equipment subjected to thermal expansion. The construction of Series 241 Spherical Roller Bearings typically consists of an inner ring with two raceways, an outer ring with a spherical raceway, and a cage assembly that retains the barrel-shaped rollers. This design facilitates smooth rotation and ensures proper alignment of the rolling elements, minimizing friction and heat generation during operation.

2. Design Features and Construction

Series 241 Spherical Roller Bearings are engineered with precision and durability in mind, utilizing high-quality materials and advanced manufacturing techniques to withstand demanding operating conditions. The inner and outer rings are typically made from hardened steel to ensure strength and resistance to wear, while the cage assembly may be constructed from steel, brass, or polyamide, depending on the application requirements. The spherical profile of the outer ring raceway enables the bearing to accommodate misalignment and axial displacement, thereby reducing the risk of edge loading and premature wear. The double-row arrangement of barrel-shaped rollers provides increased contact area and improved load distribution, resulting in higher radial and axial load capacities compared to other bearing types. To further enhance performance and reliability, Series 241 Spherical Roller Bearings may incorporate advanced sealing solutions to prevent contamination ingress and retain lubrication. These seals help prolong bearing service life by shielding the internal components from moisture, dust, and other contaminants that could compromise performance and lead to premature failure.

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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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