PRODUCTS
Ball bearings
Insert bearings
One-way bearings
Water pump bearings
Tapered roller bearings
Automotive air-conditioning compressor bearings
Cylindrical roller bearings
Clutch release bearings
Wheel hub bearings
Thrust bearings,washers
Miniature bearings
Special bearings
Bearing rings

ENGINEERING INFORMATION
Materials
Clearance
Tolerance
Vibration

CONTACT

     

ENGINEERING INFORMATION

I. MATERIALS

RINGS & BALLS-Peak Bearing uses homemade or imported vacuum degrassed, high-carbon, chromium bearing steel as its standard material for precision bearing rings and balls. Table 1 below shows the chemical composition.

Table 1             HIGH CARBON CHROMIUM BEARING STEEL       £¨units:%£©
Spec.No	Symbol	C	S1	Mn	P	S	Cr	Ni	Mo
CHINA YJZ-84	GCr15	0.95-1.05	0.15-0.35	0.20-0.40	¡Ü0.027	¡Ü0.02	1.03-1.65	¡Ü0.025	-
KOREA KS D 3525	STB 2	0.95-1.10	0.15-0.35	¡Ü0.50	¡Ü0.025	¡Ü0.025	1.30-1.60	¡Ü0.25	¡Ü0.08
	STB 3	0.95-1.10	0.40-0.70	0.9-1.15	¡Ü0.025	¡Ü0.025	0.90-1.20	¡Ü0.25	¡Ü0.08
	STB 4	0.95-1.10	0.15-0.35	¡Ü0.50	¡Ü0.025	¡Ü0.025	1.30-1.60	¡Ü0.25	0.10-0.25
JAPAN JIS G 4805	SUJ 1	0.95-1.10	0.15-0.35	¡Ü0.50	¡Ü0.025	¡Ü0.025	0.90-1.20	¡Ü0.25	¡Ü0.08
	SUJ 2	0.95-1.10	0.15-0.35	¡Ü0.50	¡Ü0.025	¡Ü0.025	1.30-1.60	¡Ü0.25	¡Ü0.08
	SUJ 3	0.95-1.10	0.40-0.70	0.90-1.15	¡Ü0.025	¡Ü0.025	0.90-1.20	¡Ü0.25	¡Ü0.08
	SUJ 4	0.95-1.10	0.15-0.35	¡Ü0.50	¡Ü0.025	¡Ü0.025	1.30-1.60	¡Ü0.25	0.10-0.25
	SUJ 5	0.95-1.10	0.40-0.70	0.90-1.15	¡Ü0.025	¡Ü0.025	0.90-1.20	¡Ü0.25	0.10-0.25
U.S.A.AISI SAE J405	E 51100	0.98-1.10	0.20-0.35	0.25-0.45	¡Ü0.025	¡Ü0.025	0.90-1.15	¡Ü0.25	¡Ü0.08
	E 52100	0.98-1.10	0.20-035	0.25-0.45	¡Ü0.025	¡Ü0.025	1.30-1.60	¡Ü0.25	¡Ü0.08
Germany VDEH(German lron & Steel Associatiobn)	105 Cr 2	1.00-1.10	0.15-0.35	0.25-0.40	¡Ü0.030	¡Ü0.025	0.40-0.60	-	-
	105 Cr 4	1.00-1.10	0.15-0.35	0.25-0.40	¡Ü0.030	¡Ü0.025	0.90-1.15	-	-
	105 Cr 6	0.90-1.05	0.15-0.35	0.25-0.40	¡Ü0.025	¡Ü0.020	1.40-1.65	-	-
	100 CrMn 6	0.90-1.05	0.50-0.70	1.00-1.20	¡Ü0.025	¡Ü0.020	1.40-1.65	-	-

RETAINERS-Our standard bearing retainers are made from quality cold rolled carbon steel. Nylon or brass are available upon request.
SEALS & SHIELDS-Our shields also employ quality carbon steel as standard. We uses a variety of high temperature operation and compatibility with grease. Buna-Nitrile is the standard material used.
LUBRICANTS-Our common greases used and their features shown in Table 2.
Table 2                 GREASE    MFGER    BRAND THICKER BASE OIL DROPPING POINT ¡¡ TEMP. Our CODE ESSO Beacom325 Lithium Diester 193 290 ¡¡ L06 AC205 Natrium Mineral ¡¡ ¡¡ -60~+120 ¡¡ Andok B. Natrium Mineral 260 280 -25~+120 L01 Andok C Natrium Mineral ¡Ý260 205 -40~+120 L02 Andok 260 Natrium Mineral 200 250 -20~+150 L07 Kyodo Yushi Multemp PS2 Lithium Diester 189 280 -50~+110 L20 Multemp SRL Lithium Ester 191 245 -40~++150 L21 Multemp SC-A Urea ¡¡ 260 280 0~+160 ¡¡ Multemp ETISO Urea Mineral 260 280 -10~+160 ¡¡ KLüber Staburags NBU12 Barium Mineral 220 270 -35~+150 ¡¡ ¡¡ Isoflex NBU15 Barium Diester Mineral 220 280 -60~+130 ¡¡ ¡¡ Asonic Gly32 Lithium Sythetic ¡¡ ¡¡ -50~+140 ¡¡ ¡¡ Asonic GHY72 Polyhamstoff Ester ¡¡ ¡¡ -40~+180 ¡¡ ¡¡ Unisilikon TK44N2 Na-Komplex Silicone ¡¡ ¡¡ -60~+230 ¡¡ Dow Corning Molykote 33M Lithium Silicone     210 260 -70~+180 ¡¡ Molykote 44M Lithium Silicone 204 260 -40~+200 ¡¡ Molykote 55M Lithium Silicone ¡¡ ¡¡ -55~+165 ¡¡ Molykote FS3451 Fluorotelomer Phlorosilicone ¡Ý260 285 -40~+230 ¡¡ Shell Alvania No.2 Lithium Mineral 182 272 -25~+120 L15 Alvania No.3 Lithium Mineral 183 233 -20~+135 L16 Alvania RS Lithium Mineral 183 252 -25~++120 ¡¡ Dolium R ¡¡ Mineral 238 281 -20~+140 ¡¡ Aero shell No.5 Microgel Mineral ¡Ý260 282 -10~+130 L40 Aero shell No.7 Microgel Diester ¡Ý260 288 -70~+150 L42 Aero shell No.15A Flaorotelomer Silicone ¡Ý260 280 -70~+260 ¡¡ Mobil Oil Mobilux 2 Lithium Mineral 190 280 -20~+130 ¡¡ Mobilgrease 22 Lithium Diester Mineral 192 274 -50~+140 L09 Mobilgrease 28 Bentonite Sythetic hydrocarbon ¡Ý260 280 -60~+180 ¡¡ Mobilplex 47 ¡¡ Mineral ¡Ý260 280 -20~+120 ¡¡ Du Pont Krytox 240AC Fluorotelomer Fluorinated ¡¡ 282 -35~+290 ¡¡ Krytox 283AC Fluorotelomer Fluorinated ¡¡ 229 -35~+290 ¡¡ Krytox 143AC Fluorotelomer Fluorinated ¡¡ ¡¡ -35~+290 ¡¡ Caltex Chevron SRI-2 Urea Mineral ¡¡ 293 -30~+175 L19 Anderol L-793A Lithium Diester ¡¡ ¡¡ -60~+150 ¡¡
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II. TOLERANCE
Bearing tolerance includes dimensional tolerance and revolving tolerance. Dimensional tolerance is a request when bearings are mounted on shafts or in housings. It includes bore/outerside diameter deviation from basic, inner ring/outer ring width deviation from basic and radius allowance . Geometric tolerance includes bore/outside diameter deviation in single plane, inner ring/outer ring width deviation in single radial plane. Revolving tolerance includes radial and axial runout of assembled bearing inner ring and outer ring, inner ring reference face runout with bore and outside cylindrical surface runout with outer ring reference face. Tolerance class ranges from common class 0 to 6,5,4 and 2,from low to high. Table 3 below is the tolerance class stipulated in Chinese GB307 standard and its comparison with some other standards.
Table 3              COMPARISON OF TOLERANCE CLASS                 Nationality Standard Number Preision grade Chinese GB307 0(G) 6E 5(D) 4(C) 2(B) ISO ISO492 0 6 5 4 2 Sweden Version 1985 0 P6 P5 P4 P2 West Germony DIN 620/2 Po P6 P5 P4 P2 U.S.A ANSI B3.14 ABEC1 ABEC3 ABEC5 ABEC7 ABEC9 Japan JIS B1514 0 6 5 4 2
The standard manufacturing tolerance for our precision radial bearings is class 6, as shown in Table 4.
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Table 4                          INNER RING                              d mm ¡÷ dmp Vdp Vdmp Kia ¡÷ BS VBS Diameter series all normal 9 0.1 2.3.4 Over Incl. High Low Max Max Max High Low Max 2.5 10 0 -7 9 7 5 5 6 0 -120 15 10 18 0 -7 9 7 5 5 7 0 -120 20 18 30 0 -8 10) 8 6 6 8 0 -120 20) 30 50 0 -10 13 10 8 8 10 0 -120 20 50 80 0 -12 15 15 9 9 10 0 -150 25
OUTER RING                             D mm ¡÷ Dmp VDP VDmp Kea ¡÷ Cs Vcs open bearings capped Diameter series 9 0.1 2.34 0.1.2.3.4 Over Incl. High Low Max Max Max High Low Max 6 18 0 -7 9 7 5 9 5 8 Identical to ¡÷ Bs and VBs of onne ring of same bearing 18 30 0 -8 10 8 6 10 6 9 30 50 0 -9 11 9 7 13 7 10 50 80 0 -11 14 11 8 16 8 13
Where:
d	Basic bore diameter
D	Basic outside diameter
¡÷ dmp	Single plane mean bore diameter deviation from basic
¡÷ Dmp	Single plane mean outer diameter deviation from basic
Vdp	Bore diameter variation in a single radial plane
VDp	Outside diameter variation in a single radial plane
Vdmp	Mean vore diameter variation
VDmp	Mean outside diameter variation
Kia	Radial runout of assembled bearing inne ring
Kea	Radial runout of assembled bearing outer ring
¡÷ Bs	Single inner ring width deviation from basic
¡÷ Cs	Single outer ring width deviation from basic
VBs	Inner ring width variation
VCs	Outer ring width variation
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III¡¢CLEARANCE
Bearing clearance means the value of displacement of the unfixed ring when it moves against the fixed ring in radial or axial direction before the bearing is mounted on a shaft or in a housing. According to the movement direction, it falls into radial clearance and axial clearance. The standard clearance for our deep groove ball bearings are divided into four groups:C2, C0, C3&C4 as shown below in Table 5:
Table 5                     RADIAL CLEARANCE                    mm(d) C2 C0 C3 C4 over incl Min Max Min Max Min Max Min Max 6 10 0 7 2 13 8 23 14 29 10 18 0 9 3 18 11 25 18 33 18 24 0 10 5 20 13 28 20 36 24 30 1 11 5 20 13 23 20 41 30 40 1 11 6 20 15 33 28 46 40 50 1 11 6 23 18 36 30 51
IV¡¢VIBRATION
Bearing vibration means bearing components' elastic deformation that varies with time and all other movement that deviates from a theoretic position except that necessary to bearing functions. It has two modes-acceleration(dB) and velocity(¦Ìm/s)¡¢Vibration acceleration is examined according to Z, Z1, Z2 and Z3 values. Grade Z is fundamental, Z1, Z2 &Z3 successively indicate the vibration level ranges from low to high. For detailed requirements, see Table6. Similary, vibration velocity is examined as per V, V1, V2 & V3. Grade V is fundamental, V1, V2 & V3 successively indicate the vibration level ranges from low to high. For details, see Table 7. Generally, velocity examination is better than acceleration examination in that it can more reflect bearings' manufacturing level and bearings/ inherent quality. While our company keeps control of vibration velocity values, we also carry out vigorous control on abnormal noise from running bearings in test according to requirements of electric motor quality bearings.
Table 6 VIBRTION (ACCELERATION)LIMITES FOR SINGLE BEARING  dB mm(d) Diameter Series£¨1£© Diameter Series£¨2£© Diameter Series£¨3£© Z Z1 Z2 Z1 Z2 Z3 Z1 Z2 Z3 5 37 36 34 37 34 32 37 35 33 6 37 36 34 37 34 32 37 35 33 7 39 38 35 38 36 34 --- --- --- 8 39 38 35 38 36 34 --- --- --- 9 41 40 36 40 37 35 --- --- --- 10 43 42 38 42 39 35 44 40 37 12 44 43 39 43 39 35 45 40 37 15 45 44 40 44 41 36 46 42 38 17 46 44 40 45 41 36 47 42 38 20 47 45 41 46 42 38 48 43 39 25 48 46 42 47 43 40 49 44 41 30 49 47 43 48 44 41 50 45 42 35 51 49 45 50 46 43 52 47 44 40 53 51 46 52 47 44 54 49 45 45 55 53 48 54 49 46 56 51 47 50 57 54 50 55 51 48 57 53 49
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Table 7 VIBRATION (VELOCITY) LIMITES FOR SINGLE BEARIN   u m/s mm(d) V V1 V2 V3 low band mid band high band low band mid band high band low band mid band high band low band mid band high band 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 60 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
Notes:
1¡¢Group V applies to manufacture's inspection on bearings; Group V1,V2&V3 apply to manufacture's and customer's inspection and acceptance on finished bearings that their vibration control demand is required by customers.
2¡¢The sinle bearing (any one from samples) is considered as unqualified product if its vibration velocity value on any band exceeds the value as stipulated in the table.

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