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PROFILE

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


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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 0.027 0.02 1.03-1.65 0.025 -
KOREA KS D 3525 STB 2 0.95-1.10 0.15-0.35 0.50 0.025 0.025 1.30-1.60 0.25 0.08
STB 3 0.95-1.10 0.40-0.70 0.9-1.15 0.025 0.025 0.90-1.20 0.25 0.08
STB 4 0.95-1.10 0.15-0.35 0.50 0.025 0.025 1.30-1.60 0.25 0.10-0.25
JAPAN JIS G 4805 SUJ 1 0.95-1.10 0.15-0.35 0.50 0.025 0.025 0.90-1.20 0.25 0.08
SUJ 2 0.95-1.10 0.15-0.35 0.50 0.025 0.025 1.30-1.60 0.25 0.08
SUJ 3 0.95-1.10 0.40-0.70 0.90-1.15 0.025 0.025 0.90-1.20 0.25 0.08
SUJ 4 0.95-1.10 0.15-0.35 0.50 0.025 0.025 1.30-1.60 0.25 0.10-0.25
SUJ 5 0.95-1.10 0.40-0.70 0.90-1.15 0.025 0.025 0.90-1.20 0.25 0.10-0.25
U.S.A.AISI SAE J405 E 51100 0.98-1.10 0.20-0.35 0.25-0.45 0.025 0.025 0.90-1.15 0.25 0.08
E 52100 0.98-1.10 0.20-035 0.25-0.45 0.025 0.025 1.30-1.60 0.25 0.08
Germany VDEH(German lron & Steel Associatiobn) 105 Cr 2 1.00-1.10 0.15-0.35 0.25-0.40 0.030 0.025 0.40-0.60 - -
105 Cr 4 1.00-1.10 0.15-0.35 0.25-0.40 0.030 0.025 0.90-1.15 - -
105 Cr 6 0.90-1.05 0.15-0.35 0.25-0.40 0.025 0.020 1.40-1.65 - -
100 CrMn 6 0.90-1.05 0.50-0.70 1.00-1.20 0.025 0.020 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 260 205 -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 260 285 -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 260 282 -10~+130

L40

Aero shell No.7 Microgel Diester 260 288 -70~+150

L42

Aero shell No.15A Flaorotelomer

Silicone

260 280 -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 260 280 -60~+180

Mobilplex 47 Mineral 260 280 -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.
BACK TO TOP

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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IIICLEARANCE
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
IVVIBRATION
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(m/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 Series1 Diameter Series2 Diameter Series3
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:
1Group 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.
2The 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.