浙江省新昌新轴实业有限公司
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地 址:浙江新昌南明街道南门外100号
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邮箱:ylq86011066@126.com

I. MATERIALS
  • RINGS & BALLS 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
 

KL über

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
 
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.

Table 4 INNER RING

d
mm
△ dmp V dp V dmp K ia △ B S V BS
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 V DP V Dmp 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
V dp Bore diameter variation in a single radial plane
V Dp Outside diameter variation in a single radial plane
V dmp Mean vore diameter variation
V Dmp 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
V Bs Inner ring width variation
V Cs Outer ring width variation
 
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
 
I V 、 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(μm/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 Z 1 Z 2 Z 1 Z 2 Z 3 Z 1 Z 2 Z 3
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
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.