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Prefix and suffix of LYC bearings
Tolerance class of LYC bearings
Materials and chemical composition of LYC bearings
Equivalent Designations of LYC bearings
Radial Internal Clearances in Deep Groove Ball Bearings
Radial Internal Clearances of Self-aligning Ball Bearings with Cylindrical bore
Radial Internal Clearances of Self-aligning Ball Bearings with tapered bore
Radial Internal Clearances in Cylindrical Roller Bearings with Cylindrical bore
Radial Internal Clearances in Spherical Roller Bearings with Cylindrical bore
Radial Internal Clearances of Spherical Roller Bearings with tapered bore
LYC Bearing Noise and Vibration Level
ANSI/AFBMA Standard for Steel Ball
Bearing damage analysis
Contact Our Engineer

Prefix and Suffix of LYC bearings

The commonly used supplementary codes by LYC are listed in the following and the meanings are explained as:

Prefix
L	Removable inner or outer ring of a separable bearing
R	Bearing without removable inner or outer ring (only suitable for needle roller bearingsof type NA)
K	Roller and cage assembly
WS	Shaft washer of a cylindrical roller thrust bearing
GS	Housing washer of a cylindrical roller thrust bearing
KOW	Thrust bearing without shaft washer
KIW	Thrust bearing without housing washer
LR	Bearing with removable inner ring or outer ring and rolling elements assembly

Suffix
Internal design
A	Deviating or modified internal design
B	Standard type (the design contents can be altered according to different bearing structures)
C Example:	B indicates nominal contact angle a = 40 for angular contact ball bearings, and it
D	indicates the increased contact angle for tapered roller bearings. C indicates nominal
E	contact angle a = 15 for angular contact ball bearings. E indicates the reinforce bearings.
AC	Nominal contact angle a =25 for angular contact ball bearings
D	Split bearings

Codes of seats, shields and external designs
K	Tapered bore, taper 1:12 on diameter
K30	Tapered bore, taper 1:30 on diameter
R	Bearing with flanged outer ring
N	Bearing with snap ring groove in outer ring
NR	Bearing with snap ring groove in outer ring and snap ring
-RS	Embedded case rubber seal at one side of the bearing (rubbing seal)
-2RS	Embedded case rubber seals at both sides of the bearing (rubbing seal)
-RZ	Embedded case rubber seal at one side of the bearing(non-rubbing seal)
-2RZ	Embedded case rubber seals at both sides of the bearing (non-rubbing seal)
-Z	Bearing with shield at one side
-2Z	Bearing with shields at both sides

Codes of bearing materials
/HE	Rings, rolling elements and cages, or only rings and rolling elements, made of electroslagrefined bearing steel ZGCr15, ZGCr15SiMn
/HA	Rings, rolling elements and cages, or only rings and rolling elements, made of vaccum arc-melted steel
/HU	Rings, rolling elements and cages or only ring and rolling elements, made of unable hardening stainless steel lCr18Ni9Ti
/HV	Rings, rolling elements and cages, or only ring and roiling elements, made of hardening stainless steel (/HV-9Crl8, /FM-9Crl8Mo)
/HN	Rings and rolling elements, made of heat-resisting bearing steel (/HN-Cr4Mo4V, /HNI-Cr 14Mc)4, /liN2-Crl5Mo4V, /1-fN3-Wl8Cr4V)
/HC	Rings rolling elements, or only rolling elements, made of carburized steel (/HC-2OCr2Ni4 A, /HCI-2OCr2MoA, /liC2-15Mn)
/HP	Rings and rolling elements, made of beryllium bronze or other anti-magnetic matertials.
/HG	Rings and rolling elements, or only rings, made of other bearing steels (HG-5CrmnMo, /HG1-55SiMoVA)
F	Solid cage, made of steel, nodular cast iron or powder metallurgy, the additional figure indicates the different materials
	Fl-carbori steel, F2-graphite steel, F3-nodular cast iron, F4-powder metallurgy
Q	Bronze solid cage, the additional figure indicates the different materials
	Q1-ferro-aluminium manganese bronze, Q2-ferro-silicon zinc bronze,
	Q3-nichrome silicon bronze, Q4-alurninium bronze
M	Brass solid cage
L	Light alloy solid cage, the additional figure indicates the different materials L-LY11CZ, L1-LY12CZ
T	Phenolic resin solid cage
TH	Glass-fibre-reinforced phenolic resin cage (basket type)
TN	Moulded cage with engineering plastic, the additional figure indicates the different
	materials TNI-nylon, TN2-polysulfone, TN3-polyimide TN4-polycarbonate, TN5-polyfoffnal dehydez
J	Pressed steel plate cage, the additional figure indicates the different materials
Y	Pressed brass plate cage, the additional figure indicates the different materials
SZ	Cage is made of spring steel wire or spring plate
V	Full complement beating (without cage)

Tolerance and clearance
/P6	Tolerance class conforms to standard group 6
/P6X	Tolerance class conforms to standard class 6x
/P5	Tolerance class conforms to standard class 5
/P4	Tolerance class conforms to standard class 4
/P2	Tolerance class conforms to standard class 2
/Cl	Internal clearance conforms to standard group 1
/C2	Internal clearance conforms to standard group 2
/C3	Internal clearance conforms to standard group 3
/C4	internal clearance conforms to standard group 4
/C5	Internal clearance conforms to standard group 5
/C9	Bearing internal clearance differs from the present standard, the tolerance class and clearance can be simplified into /P63R43, when they need to be expressed simultaneously

Codes of bearing arrangement
/DB	Back-to-back arrangement
/DF	Face-to-face arrangement
/DT	Tandem arrangement

Other bearing features
/Z	limited values of the vibration acceleration level, the additional figures indicate the different limited values, as Z1, Z2, Z3
/V	Limited values of the vibration speed level, the additional figures express the different values, as V1, V2, V3
/S0	The bearing rings are tempered through heat treatment, and the operating temperature is up to 150 C
/SI	The bearing rings are tempered through heat treatment, and the operating temperature is up to 200 C
/S2	The bearing rings are tempered through heat treatment, and the operating temperature is up to 250 C
/S3	The bearing rings are tempered through heat treatment, and the operating temperature is up to 300 C
/S4	The bearing rings are tempered through beat treatment, and the operating temperature is up to 350 C
/W20	The bearing with three lubrication holes in outer ring
/W26	The bearing with six lubrication holes in outer ring
/W33	The bearing with a lubrication groove and six lubrication holes in outer ring
/W33X	The bearing with three lubrication holes and six lubrication holes in outer ring
/AS	The beating with lubrication hole in outer ring, the additional figure shows the numbers of oil hole (used for needle roller hearings)
/IS	The bearing is filled with special grease for high temperature, grease quantities differ from the standard filling are identified by an additional letter
/HT	The bearing is filled with special grease for high temperature, grease quantities differ from the standard filling are identified by an additional letter
	A:: grease quantity is less than standard filling
	B: grease quantity is more than standard filling
	C: full quantity of grease
/LT	Bearing with the grease for lower temperature, the additional letter is the same meaning as /HT
/MT	Bearing with the grease for medium temperature, the additional letter is the same meaning as /HT
/LHT	Bearing with the grease for lower or higher temperature, the additional letter is the same meaning as /HT
/Y	Combinations of the letter Y with another letter or figure can identify differences from the standard design which are not concluded by other established suffixes
	/YA Modification of structures (comprehensive expression)
	/YA1 The outer surface of bearing outer ring differs from that of standard design
	/YA2 The outer surface of bearing outer ring differs from that of standard design
	/YA3 The outer surface of bearing outer ring differs from that of standard design
	/YA4 The outer surface of bearing outer ring differs from that of standard design
	/YA5 The outer surface of bearing outer ring differs from that of standard design
	/YA6 The outer surface of bearing outer ring differs from that of standard design
	/YA7 The outer surface of bearing outer ring differs from that of standard design
	/YA8 The outer surface of bearing outer ring differs from that of standard design
	/YA9 The outer surface of bearing outer ring differs from that of standard design
	/YA10 The outer surface of bearing outer ring differs from that of standard design

If suffix Y with another letter or additional figure are presented in bearing designations, the product drawings or the supplementary specifications must be looked up.
In this catalog, LYC designations of inch size tapered roller bearings are basically corresponding to TIMKEN designations.

Tolerance class of LYC Bearings

LYC	0	6	5	4	2
ISO	0	6	5	4	2
ANSI	ABEC-1	ABEC-3	ABEC-5	ABEC-7	ABEC-9
SKF	0	P6	P5	P4	P2
DIN	0	P6	P5	P4	P2
JIS	0	6	5	4

Chemical Composition of Steels for LYC bearings (%)

Element	C	Si	Mn	Cr	Ni	Mo	P	S	Cu
GCr15	0.95~1.05	0.15~0.35	0.25~0.45	1.40~1.64	---	---	<=0.025	<=0.025	---
GCr15SiMn	0.95~1.05	0.45~0.75	0.95~1.25	1.40~1.64	---	---	<=0.025	<=0.025	---
G20CrNi2Mo	0.17~0.23	0.15~0.40	0.40~0.70	0.35~0.65	1.60~2.00	1.60~2.00	<=0.030	<=0.030	<=0.25
G20Cr2Ni4	0.17~0.23	0.15~0.40	0.30~0.60	1.25~1.75	3.25~3.75	---	<=0.030	<=0.030	<=0.25
50Mn	0.48~0.56	0.17~0.37	0.70~1.00	---	---	---	---	---	---
42CrMo	0.38~0.45	0.17~0.37	0.50~0.80	0.90~1.20	---	0.15~0.25	---	---	---

Equivalent Designations of LYC bearings

LYC (China)	ASTM(USA)	DIN(GERMANY)	JIS(JAPAN)
GCr15	AISI 52100	DIN100Cr6	JIS SUJ2
GCr15SiMn		DIN100CrMn67
G20CrNi2Mo	AISI 4320		JIS SNCM415
G20Cr2Ni4	AISI 3316
50Mn	AISI 1551
42CrMo		DIN 42CrMo4	JIS SCM 440

Radial Internal Clearances in Deep Groove Ball Bearings

Nominal bore diameter d (mm)		C2		Normal		C3		C4		C5
Over	Incl.	min	max	min	max	min	max	min	max	min	max
2.5	6	0	7	2	13	8	23	---	---	--	---
6	10	0	7	2	13	8	23	14	29	20	37
10	18	0	9	3	18	11	25	18	33	25	45
18	24	0	10	5	20	13	28	20	36	20	48
24	30	1	11	5	20	13	28	23	41	30	53
30	40	1	11	6	20	15	33	28	46	40	64
40	50	1	11	6	23	18	36	30	51	45	73
50	65	1	15	8	28	23	43	38	61	55	90
65	80	1	15	10	30	25	51	46	71	65	105
80	100	1	18	12	36	30	58	53	84	75	120
100	120	2	20	15	41	36	66	61	97	90	140
120	140	2	23	18	48	41	81	71	114	105	160
140	160	2	23	18	53	46	91	81	130	120	180
160	180	2	25	20	61	53	102	91	147	135	200
180	200	2	30	25	71	63	117	107	163	150	230
200	225	2	35	25	85	75	140	125	195	175	265
225	250	2	40	30	95	80	160	145	225	205	300
250	280	2	45	35	105	90	170	155	245	225	340
280	315	2	55	40	115	100	190	175	270	245	370
315	355	3	60	45	125	110	210	195	300	275	410
355	400	3	70	55	140	130	140	225	340	315	460
400	450	3	80	60	170	150	270	250	380	350	510
450	500	3	90	70	190	170	300	280	420	390	570
500	560	10	100	80	210	190	330	310	470	440	630
560	630	10	110	90	230	210	360	340	520	490	690
630	710	20	130	110	260	240	400	380	570	540	760
710	800	20	140	120	290	270	450	430	630	600	840
800	900	20	160	140	320	300	500	480	700	670	940
900	1000	20	170	150	350	330	550	530	770	740	1040
1000	1120	20	180	160	380	360	600	580	850	820	1150
1120	1250	20	190	170	410	390	650	630	920	890	1260

Radial Internal Clearances of Self-aligning ball Bearings with cylindrical bore (um)

Nominal bore diameter d (mm)		C2		Normal		C3		C4		C5
over	incl.	min	max	min	max	min	max	min	max	min	max
10	14	2	10	6	19	13	26	21	35	30	48
14	18	3	12	8	21	15	28	23	37	32	50
18	20	4	14	10	23	17	30	25	39	34	52
24	30	5	16	11	24	19	35	29	46	40	58
30	40	6	18	13	29	23	40	34	53	46	66
40	50	6	19	14	31	25	44	37	57	50	71
50	65	7	21	16	36	30	50	45	69	62	88
65	80	6	24	18	40	35	60	54	83	76	108
60	100	9	27	22	48	42	70	64	96	89	124
100	120	10	31	25	56	50	83	75	114	105	145
120	140	10	38	30	68	60	100	90	135	125	175
140	160	15	44	35	80	70	120	110	161	150	210

Radial Internal Clearances of Self-aligning ball Bearings with tapered bore (um)

Nominal bore diameter d (mm)		C2		Normal		C3		C4		C5
over	incl.	min	max	min	max	min	max	min	max	min	max
18	24	7	17	13	26	20	33	28	42	37	55
24	30	9	20	15	28	23	39	33	50	44	62
30	40	12	24	19	35	29	46	40	59	52	72
40	50	14	27	22	39	33	52	45	65	58	79
50	65	18	32	27	47	41	61	56	80	73	99
65	80	23	39	35	57	50	75	69	98	91	123
80	100	29	47	42	68	62	90	84	116	109	144
100	120	135	56	50	81	75	108	100	139	130	170
120	140	40	68	60	98	90	130	120	165	155	205
140	160	45	74	65	110	100	150	140	191	180	240

Radial Internal Clearances in Cylindrical Roller Bearings with Cylindrical bore (um)

Nominal bore diameter d (mm)		C2		Normal		C3		C4		C5
over	incl.	min	max	min	max	min	max	min	max	min	max
	10	0	25	20	45	35	60	50	75	--	--
10	24	0	25	20	45	35	60	50	75	65	90
24	30	0	25	20	45	35	60	50	75	70	95
30	40	5	30	25	50	45	70	60	85	85	105
40	50	5	35	30	60	50	80	70	100	95	125
50	65	10	40	40	70	60	90	80	110	110	140
65	80	10	45	40	75	65	100	90	125	130	165
80	100	15	50	50	85	75	110	105	140	155	190
100	120	15	55	50	90	85	125	125	165	180	220
120	140	15	60	60	105	100	145	145	190	200	2454
140	160	20	70	70	120	115	165	165	215	225	275
160	180	25	75	75	125	120	170	170	220	250	300
180	200	35	90	90	145	140	195	195	250	275	330
200	225	45	105	105	165	160	220	220	280	305	365
225	250	45	110	110	175	170	235	235	300	330	395
250	280	55	125	125	195	190	260	260	330	370	440
280	315	55	130	130	205	200	275	275	350	410	485
315	355	65	145	145	225	225	305	305	385	455	535
355	400	100	190	190	280	280	370	370	460	510	600
400	450	110	210	210	310	310	410	410	510	565	665
450	500	110	220	220	330	330	440	440	550	625	735

Radial Internal Clearances of Spherical Roller Bearings with cylindrical bore (um)

Nominal bore diameter d (mm)		C2		Normal		C3		C4		C5
over	incl.	min	max	min	max	min	max	min	max	min	max
14	18	10	20	20	35	35	45	45	60	60	75
18	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	340	340	430	430
200	225	80	140	140	220	220	290	380	380	470	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	550	550	690	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	1720
1120	1250	320	580	580	860	860	1120	1120	1460	1460	1870
1250	1400	350	640	640	950	950	1240	1240	1620	1620	2080

Radial Internal Clearances of Spherical Roller Bearings with tapered bore (um)

Nominal bore diameter d (mm)		C2		Normal		C3		C4		C5
over	incl.	min	max	min	max	min	max	min	max	min	max
18	24	15	25	75	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	60	50	70	70	95	95	120	120	150	150	200
90	100	55	80	80	110	110	140	140	180	180	230
100	120	65	100	100	135	135	170	170	220	220	260
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	370	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	190	270	270	360	360	470	470	590	590	740
355	400	210	300	300	400	400	520	520	650	560	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	670	1100
560	630	320	460	460	600	600	780	760	900	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	640	1070	1070	1370	1370	1690
900	1000	490	710	710	930	330	1190	1190	1520	1520	1860
1000	1120	530	770	770	1030	30	1300	1300	1670	1670	2050
1120	1250	570	830	830	1120	120	1420	1420	1830	1830	2250
1250	1400	620	910	910	1230	230	1560	1560	2000	2000	2470

LYC Bearing Noise and Vibration Level
Accelerator

Nominal bore diameter d (mm)	Single Bearing Vibration Reading (dB) not exceed
	6000 Series			6200 Series				6300 Series
	Z	Z1	Z2	Z	Z1	Z2	Z3	Z	Z1	Z2	Z3
3	35	34	32	36	35	32	30	37	36	33	31
4	35	34	32	36	35	32	30	37	36	33	31
5	37	36	34	38	37	34	32	39	37	35	33
6	37	36	34	38	37	34	32	39	37	35	33
7	39	38	35	40	38	36	34	--	--	--	--
8	39	38	35	40	38	36	34	--	--	--	--
9	41	40	36	42	40	37	35	--	--	--	--
10	43	42	38	44	42	39	35	46	44	40	37
12	44	43	39	45	43	39	35	47	45	40	37
15	45	44	40	46	44	41	36	48	46	42	38
17	46	44	40	47	45	41	36	49	47	42	38
20	47	45	41	48	46	42	38	50	48	43	39
25	48	46	42	49	47	43	40	51	49	44	41
30	49	47	43	50	48	44	41	52	50	45	42
35	51	49	45	52	50	46	43	54	52	47	44
40	53	51	46	54	52	47	44	56	54	49	45
45	55	53	48	56	54	49	46	58	56	51	47
50	57	54	50	58	55	51	48	60	57	53	49
55	59	56	52	60	57	53	50	62	59	54	51
60	61	58	54	62	59	54	51	64	61	56	53
65	49	48	46	50	49	47	42	51	50	48	43
70	50	49	47	51	50	48	43	52	51	49	44
75	51	50	48	52	51	49	44	53	52	50	45
80	52	51	49	53	52	50	45	54	53	51	46
85	53	52	50	54	53	51	46	56	55	52	47
90	54	53	52	56	55	53	48	58	57	54	49
95	56	55	54	58	57	55	50	60	59	56	51
100	58	57	56	60	59	57	52	62	61	58	53
105	60	59	58	62	61	59	54	64	63	60	55
110	62	61	60	64	63	61	56	66	65	62	57
120	64	63	62	66	65	63	58	68	67	64	59

Anderons
ROTATION SPEED: 1800R/min

Nominal bore diameter d (mm)	Single Bearing Vibration Reading(um/s) not exceed
	V			V1			V2			V3
	L	M	H	L	M	H	L	M	H	L	M	H
5	110	72	60	90	60	50	58	36	30	35	21	18
6	110	72	60	90	60	50	58	36	30	35	21	18
7	130	96	80	110	80	65	72	48	40	44	28	24
8	130	96	80	110	80	65	72	48	40	44	28	24
9	130	96	80	110	80	65	72	48	40	44	28	24
10	160	120	100	140	100	85	90	60	50	55	35	30
12	160	120	100	140	100	85	90	60	50	55	35	30
15	210	150	120	180	130	100	110	78	60	65	46	35
17	210	150	120	180	130	100	110	78	60	65	46	35
20	260	190	150	220	160	125	130	100	75	80	60	45
22	260	190	150	220	160	125	130	100	75	80	60	45
25	260	190	150	220	160	125	130	100	75	80	60	45
28	260	190	150	220	160	125	130	100	75	80	60	45
30	300	240	190	250	200	160	150	120	100	90	75	60
32	300	240	190	250	200	160	150	120	100	90	75	60
35	300	240	190	250	200	160	150	120	100	90	75	60
40	360	300	260	300	250	220	180	150	130	110	90	80
45	360	300	260	300	250	220	180	150	130	110	90	80
50	420	320	320	350	270	270	210	160	160	125	100	100
55	420	360	360	350	300	300	210	180	180	125	110	110
60	480	360	440	400	300	370	240	180	220	145	110	130

ROTATION SPEED: 900R/min

Nominal bore diameter d (mm)	Single Bearing Vibration Reading (um/s) not exceed
	V			V1			V2			V3
	L	M	H	L	M	H	L	M	H	L	M	H
65	300	260	420	250	220	350	160	130	180	105	80	105
70	360	310	460	300	260	390	180	150	230	110	90	135
75	360	310	460	300	260	390	180	150	230	110	90	135
80	420	360	540	350	300	450	210	180	270	130	110	160
85	420	360	540	350	300	450	210	180	270	130	110	160
90	480	420	600	400	350	500	240	210	300	145	125	180
95	480	420	600	400	350	500	240	210	300	145	125	180
100	560	490	670	470	410	565	280	245	340	170	145	204
105	560	490	670	470	410	565	280	245	340	170	145	204
110	640	570	750	540	480	630	320	290	380	190	175	225
120	640	570	750	540	480	630	320	290	380	190	175	225

ANSI/AFBMA Standard for Steel Ball

Grade	Basic diameter tolerance	Batch diameter variable	Spherical diameter variable	Spherical deviation	Surface roughness
Grade	um				Ra
3	±0.75	0.13	0.08	0.08	0.012
5	±1.25	0.25	0.13	0.13	0.002
10	±2.5	0.5	0.25	0.25	0.025
16	±2.5	0.8	0.4	0.4	0.025
24	±2.5	1.2	0.6	0.6	0.050
48	±5	2.4	1.2	1.2	0.080
60	±10	3	1.5	1.5	0.100
100	±12.5	5	2.5	2.5	0.125
200	±25	10	5	5	0.200
500	±50	25	13	13	-
1000	±125	50	25	25	-
2000	±125	100	50	50	-
3000	±125	150	80	80	-

Bearing Damage Analysis

Peeling off

Peeling off and deformation of the rotational surface

Possible reasons

Load too heavy or improper applications
Mal-mounting
Poor precision of the shaft or bearing box
Clearance too small
Intrusion of foreign matters
Rusting
Hardness decrease caused by abnormal high temperature

Solutions

Re-consider the application conditions
Consider other bearing specifications
Check the processing precision of the shaft and bearing box
Consider the surrounding design
Check the mounting method
Check the lubricant and lubrication method

Burns

Overheat color varying then bearing, leading to failure to rotate

Possible reasons

Clearance too small (including clearance for the deforming part)
Insufficient lubrication or inappropriate lubricant
Load too heavy (pre-load too heavy)
Skewing rollers

Solutions

Choose proper clearance(increasing clearance)
Check lubricant type and ensuring amount
Check application conditions
Avoid position error
Check surrounding design(including lead to bearing)
Improve the mounting method

Cracks

Partial breach and even cracks

Possible reasons

Shock load too heavy
Interference too big
Big peeling off and frictional cracks
Poor precision of the mounting side(corner circle too big)
Frictional cracks
Mal-applications(using copper hammer, intrusion of big foreign matter)

Solutions

Check the application conditions
Set proper interference and check material quality
Improve mounting and application methods
Prevent frictional cracks(check lubricants)
Check bearing surrounding design

Cage damage

Loosening or broken rivet
Broken cage
Possible reasons

Torque load too big
High speed rotation or speed changing too frequently
Poor lubrication
Intrusion of foreign matter
Vibration too big
Bad mounting(mounting in leaning conditions)
Abnormal increase in temperature(resin cage)

Solutions

Check application conditions
Check lubrication conditions
Re-consider choice of cage
Pay attention to applications
Consider rigidity of shaft and bearing box

Scratches

Rough surface with small deposit
Scratches between the flanges of rings and the side surfaces of the rollers
Possible reasons

Poor lubrication
Intrusion of foreign matter
Skewing rollers caused by leaning
Axial load too big leading to no lubricant on flange surface
Roughness of the surface too big
Big sliding of the rolling elements

Solutions

Re-consider lubricant and lubricating method
Check application method
Set proper pre-load
Reinforce the sealing function
Use bearings correctly

Rusting corrosion

Rusting on all or part of the surface
Rust on rolling elements in pitch shape

Possible reasons

Poor maintenance
Improper packaging
Insufficient rust-preventive
Intrusion of moist acid liquid
Taking the bearing by hands

Solutions

Maintenance to prevent rusting
Reinforcing the sealing function
Check the lubricant regularly
Pay attention to bearing applications

Corrosion

Red corroded particles in the fit surface

Possible reasons

Insufficient amount of interference
Small bearing oscillating angle
Insufficient lubrication(or without lubrication)
Not stable load
Vibration in the transit

Solutions

Check the interference and the conditions of the lubricant
Separable packing of inner rings and outer rings when in transit,pre-load shall prevail if the bearings are un-separable
Re-consider choice of lubricant
Re-consider choice of bearings

Wear

Surface worn, leading to dimension changes with scratches and traces

Possible reasons

Foreign matters in the lubricant
Poor lubrication
Rollers skewing

Solutions

Check lubricant and lubrication method
Reinforce sealing function
Prevent positioning error

Electric corrosion

Crater-like pits on the rolling surface and possible development of corrugation shape

Possible reasons

Electrical current in the rolling surface

Solutions

Use current by-pass value
Adopt insulation to avoid current passing through inside of the bearing

Dent and bruise

Intrusion of solid foreign matter or pits in the surface caused by shock or scratches from mounting

Possible reasons

Solid foreign matter intrusion
Peels inside the bearing
Shock from mal-mounting peeling off
Mounting in leaning conditions

Solutions

Improve mounting and application methods
Prevent foreign matters from intruding
Check other parts if caused by metal pieces

Creep deformation

Slippery ID surface and OD surface leading to mirror surface and sometime blocking

Possible reasons

Insufficient interference at the fit surface
Sleeve not fastened enough
Abnormal increase in temperature
Load too heavy

Solutions

Re-consider the interference amount
Consider the application conditions
Check precision of shaft and bearing box

Contact Engineer

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LYC North America, Inc. Tel: (630) 262-0601, Fax: (630) 262-0638. Email: sales@lycbearings.com

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