Product Specification: 688 ZZ/2RS Deep Groove Ball Bearing
1. Technical Parameters
Basic Dimensions
| Parameter |
Value |
|
| Inner Diameter (d) |
8 mm |
|
| Outer Diameter (D) |
16 mm |
|
| Width (B) |
5 mm |
|
Performance Data
| Parameter |
Value |
| Dynamic Load Rating (Cr) |
1.96 kN |
| Static Load Rating (C0r) |
0.96 kN |
| Limiting Speed (Grease) |
34,000 rpm |
| Limiting Speed (Oil) |
40,000 rpm |
| Weight |
4.5 g |
Features
- Sealing: Dual protection (ZZ: Metal shields + 2RS: Rubber seals).
- Material: Chrome steel (GCr15), HRC 60-64 hardness.
- Lubrication: Pre-lubricated with high-speed grease (optional customization).
2. Key Applications
688 ZZ/2RS bearings are engineered for compact, high-speed, and moderate-load scenarios:
- Electric Tools:
- Drills, grinders, and small motors.
- Home Appliances:
- Cooling fans, washing machine pumps, vacuum cleaners.
- Automotive Components:
- Window regulators, wiper motors, alternators.
- Industrial Machinery:
- Miniature gearboxes, conveyor rollers, textile spindles.
3. Competitive Advantages
| Feature |
Benefit |
| Dual Sealing |
Dust/water resistance for harsh environments (IP65 equivalent). |
| Low Noise |
Precision grinding ensures <20 dB(A) at 10,000 rpm. |
| Long Service Life |
10,000+ hours under standard operating conditions (25°C, 50% RH). |
| |
|
4. Quality Assurance
- Certifications: ISO 9001:2015, RoHS, REACH compliant.
- Testing: 100% rotational torque and noise level inspection.
5. Customization Options
- Material: Stainless steel (AISI 440C), ceramic hybrid.
- Lubricant: Food-grade grease, high-temperature grease (-40°C to 200°C).
- Special Markings: Laser engraving for traceability.
6. Ordering Information
| Part Number |
Sealing Type |
MOQ |
Lead Time |
| 688-ZZ |
Metal shields |
500 pcs |
7-10 days |
| 688-2RS |
Rubber seals |
500 pcs |
7-10 days |
| 688-ZZ/2RS |
Hybrid sealing |
1,000 pcs |
15 days (custom) |
Technical Parameters of Power Tool Ball bearings:
|
Basic
Bearing
No.
|
Bore d
|
Outer Diameter D
|
Width W
|
Radius r
|
Basic Load
Rating KN
|
Maximum Run
out Speed
|
Weight
Kg/pc
|
|
|
Dynamic
|
Static |
Grease
|
Oil |
|
| mm |
inch |
mm |
inch |
mm |
inch |
mm |
inch |
C
|
CO
|
r/min
|
r/min
|
|
604
|
4
|
0.1575 |
12
|
0.4724 |
4
|
0.1575 |
0.2
|
0.008 |
0.97
|
0.36
|
43000
|
51000
|
0.002
|
|
605
|
5
|
0.1969 |
14
|
0.5512 |
5
|
0.1969 |
0.2
|
0.008 |
1.33
|
0.505
|
39000
|
46000
|
0.0035
|
|
606
|
6
|
0.2362 |
17
|
0.6693 |
6
|
0.2362 |
0.3
|
0.012 |
2.24
|
0.91
|
28000
|
36000
|
0.008
|
|
607
|
7
|
0.2756 |
19
|
0.7480 |
6
|
0.2362 |
0.3
|
0.012 |
2.24
|
0.91
|
28000
|
36000
|
0.008
|
|
608
|
8
|
0.3149 |
22
|
0.8661 |
7
|
0.2756 |
0.3
|
0.012 |
3.35
|
1.4
|
26000
|
34000
|
0.012
|
|
609
|
9
|
0.3543 |
24
|
0.9449 |
7
|
0.2756 |
0.3
|
0.012 |
3.4
|
1.45
|
22000
|
30000
|
0.014
|
|
6000
|
10
|
0.3937 |
26
|
1.0236 |
8
|
0.3150 |
0.3
|
0.012 |
4.55
|
1.96
|
20000
|
28000
|
0.019
|
|
6001
|
12
|
0.4724 |
28
|
1.1024 |
8
|
0.3150 |
0.3
|
0.012 |
5.1
|
2.39
|
19000
|
26000
|
0.021
|
|
6002
|
15
|
0.5906 |
32
|
1.2598 |
9
|
0.3543 |
0.3
|
0.012 |
5.6
|
2.84
|
18000
|
24000
|
0.03
|
|
6003
|
17
|
0.6693 |
35
|
1.3780 |
10
|
0.3937 |
0.3
|
0.012 |
6.8
|
3.35
|
17000
|
22000
|
0.039
|
|
6004
|
20
|
0.7874 |
42
|
1.6535 |
12
|
0.4724 |
0.6
|
0.024 |
9.4
|
5.05
|
15000
|
19000
|
0.069
|
|
6005
|
25
|
0.9843 |
47
|
1.8504 |
12
|
0.4724 |
0.6
|
0.024 |
10.1
|
5.85
|
13000
|
17000
|
0.08
|
|
6006
|
30
|
1.1811 |
55
|
2.1654 |
13
|
0.5118 |
1.0
|
0.039 |
13.2
|
8.3
|
12000
|
15000
|
0.116
|
Other Technical Data of Ball Bearings
![image.png]()
ABEC-1 Tolerance Class ABEC-1 (P0)
|
Inner Ring
|
Tolerance in um/s
|
|
d mm
|
Δdmp
|
9
|
Vdp²)0,1 Diameter Series
|
2,3,4
|
Vdmp
|
Kia
|
ΔBs
|
Vbs
|
|
|
over
|
including
|
high
|
low
|
max
|
max
|
max
|
high
|
low
|
max
|
|
1)0.6
|
2.5
|
0
|
-8
|
10
|
8
|
6
|
6
|
10
|
0
|
-40
|
12
|
|
2.5
|
10
|
0
|
-8
|
10
|
8
|
6
|
6
|
10
|
0
|
-120
|
15
|
|
10
|
18
|
0
|
-8
|
10
|
8
|
6
|
6
|
10
|
0
|
-120
|
20
|
|
18
|
30
|
0
|
-10
|
13
|
10
|
8
|
8
|
13
|
0
|
-120
|
20
|
|
30
|
50
|
0
|
-12
|
15
|
12
|
9
|
9
|
15
|
0
|
-120
|
20
|
|
50
|
80
|
0
|
-15
|
19
|
19
|
11
|
11
|
20
|
0
|
-150
|
25
|
|
Outer Ring
|
Tolerance in um/s
|
|
D mm
|
Δdmp
|
VDp2)4)Open Bearings Diameter Series
|
Capped Bearings2)3)
|
Vdmp
|
Kia
|
ΔBs
|
Vbs
|
|
9
|
0,1
|
2,3,4
|
2,3,4
|
|
over
|
including
|
high
|
low
|
max
|
max
|
max
|
high
|
low
|
max
|
|
1)2.5
|
6
|
0
|
-8
|
10
|
8
|
6
|
10
|
6
|
15
|
Identical to ΔBs and VBs of inner ring of same bearing
|
|
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
|
ABEC-3 Tolerance Class ABEC-3 (P6)
|
Inner Ring
|
Tolerance in um/s
|
|
d mm
|
Δdmp
|
9
|
Vdp²)0,1 Diameter Series
|
2,3,4
|
Vdmp
|
Kia
|
ΔBs
|
Vbs
|
|
|
over
|
including
|
high
|
low
|
max
|
max
|
max
|
high
|
low
|
max
|
|
11)0.6
|
2.5
|
0
|
-7
|
9
|
7
|
5
|
5
|
5
|
0
|
-40
|
12
|
|
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
|
Tolerance in um/s
|
|
D mm
|
Δdmp
|
VDp2)4)Open Bearings Diameter Series
|
Capped Bearings2)3)
|
Vdmp
|
Kia
|
ΔBs
|
Vbs
|
|
9
|
0,1
|
2,3,4
|
2,3,4
|
|
over
|
including
|
high
|
low
|
max
|
max
|
max
|
high
|
low
|
max
|
|
1)2.5
|
6
|
0
|
-7
|
9
|
7
|
5
|
9
|
5
|
8
|
Identical to ΔBs and VBs of inner ring of same bearing
|
|
6
|
18
|
0
|
-7
|
9
|
7
|
5
|
9
|
5
|
8
|
|
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
|
|
80
|
120
|
0
|
-13
|
16
|
16
|
10
|
20
|
10
|
18
|
|
120
|
150
|
0
|
-15
|
19
|
19
|
11
|
25
|
11
|
20
|
ABEC-5 Tolerance Class ABEC-5 (P5)
|
Inner Ring
|
Tolerance in um/s
|
|
d mm
|
Δdmp
|
Vdp²)Diameter Series
|
Vdmp
|
Kia
|
Sd
|
Sis3)
|
ΔBs
|
Vbs
|
|
9
|
0,1,2,3,4
|
|
over
|
including
|
high
|
low
|
max
|
3
|
max
|
max
|
max
|
High
|
Low
|
max
|
|
1)0.6
|
2.5
|
0
|
-5
|
5
|
4
|
3
|
4
|
7
|
7
|
0
|
-40
|
5
|
|
2.5
|
10
|
0
|
-5
|
5
|
4
|
3
|
4
|
7
|
7
|
0
|
-40
|
5
|
|
10
|
18
|
0
|
-5
|
5
|
4
|
3
|
4
|
7
|
7
|
0
|
-80
|
5
|
|
18
|
30
|
0
|
-6
|
6
|
5
|
3
|
4
|
8
|
8
|
0
|
-120
|
5
|
|
30
|
50
|
0
|
-8
|
8
|
6
|
4
|
5
|
8
|
8
|
0
|
-120
|
5
|
|
50
|
80
|
0
|
-9
|
9
|
7
|
5
|
5
|
8
|
8
|
0
|
-150
|
6
|
|
Outer Ring
|
Tolerance in um/s
|
|
D mm
|
Δdmp
|
Vdp²)Diameter Series
|
Vdmp
|
Kia
|
SD4) SD15)
|
Sea4)5)
|
ΔBs
|
Vbs
|
|
9
|
0,1,2,3,4
|
|
over
|
including
|
high
|
low
|
max
|
|
max
|
max
|
max
|
High
|
Low
|
max
|
|
1)2.5
|
6
|
0
|
-5
|
5
|
4
|
3
|
5
|
8
|
8
|
|
5
|
|
6
|
18
|
0
|
-5
|
5
|
4
|
3
|
5
|
8
|
8
|
5
|
|
18
|
30
|
0
|
-6
|
6
|
5
|
3
|
6
|
8
|
8
|
5
|
|
30
|
50
|
0
|
-7
|
7
|
5
|
4
|
7
|
8
|
8
|
5
|
|
50
|
80
|
0
|
-9
|
9
|
7
|
5
|
8
|
8
|
10
|
6
|
|
80
|
120
|
0
|
-10
|
10
|
8
|
5
|
10
|
9
|
11
|
8
|
|
120
|
150
|
0
|
-11
|
11
|
8
|
6
|
11
|
10
|
13
|
8
|
ABEC-7 Tolerance Class ABEC-7 (P4)
|
Inner Ring
|
Tolerance in um/s
|
|
d mm
|
Δdmp
|
Δds
|
Vdp²)Diameter Series
|
Vdmp
|
Kia
|
Sd
|
Sia
|
ΔBs
|
Vbs
|
|
7,8,9
|
1,7,2,3,4
|
|
over
|
including
|
high
|
low
|
high
|
low
|
max
|
max
|
max
|
max
|
max
|
High
|
low
|
Low
|
max
|
|
1)0.6
|
2.5
|
0
|
-4
|
0
|
-4
|
4
|
3
|
2
|
2.5
|
3
|
3
|
0
|
-40
|
-40
|
2.5
|
|
2.5
|
10
|
0
|
-4
|
0
|
-4
|
4
|
3
|
2
|
2.5
|
3
|
3
|
0
|
-40
|
-40
|
2.5
|
|
10
|
18
|
0
|
-4
|
0
|
-4
|
4
|
3
|
2
|
2.5
|
3
|
3
|
0
|
-80
|
-80
|
2.5
|
|
18
|
30
|
0
|
-5
|
0
|
-5
|
5
|
4
|
2.5
|
3
|
4
|
4
|
0
|
-120
|
-120
|
2.5
|
|
30
|
50
|
0
|
-6
|
0
|
-5
|
6
|
4
|
3
|
4
|
4
|
4
|
0
|
-120
|
-120
|
3
|
|
50
|
80
|
0
|
-7
|
0
|
-5
|
7
|
5
|
3.5
|
4
|
5
|
5
|
0
|
-150
|
-150
|
4
|
|
Outer Ring
|
Tolerance in um/s
|
|
D mm
|
Δdmp
|
Δds
|
Vdp²)Diameter Series
|
Vdmp
|
Kia
|
Sd
|
Sia
|
ΔBs
|
Vbs
|
|
7,8,9
|
1,7,2,3,4
|
|
over
|
including
|
high
|
low
|
high
|
low
|
max
|
max
|
max
|
max
|
max
|
High
|
low
|
max |
|
1)2.5
|
6
|
0
|
-4
|
0
|
-4
|
4
|
3
|
2
|
3
|
4
|
5
|
Identical to ΔBs and VBs of inner ring of same bearing
|
2.5
|
|
6
|
18
|
0
|
-4
|
0
|
-4
|
4
|
3
|
2
|
3
|
4
|
5
|
2.5
|
|
18
|
30
|
0
|
-5
|
0
|
-5
|
5
|
4
|
2.5
|
4
|
4
|
5
|
2.5
|
|
30
|
50
|
0
|
-6
|
0
|
-6
|
6
|
5
|
3
|
5
|
4
|
5
|
2.5
|
|
50
|
80
|
0
|
-7
|
0
|
-7
|
7
|
5
|
3.5
|
5
|
4
|
5
|
3
|
|
80
|
120
|
0
|
-8
|
0
|
-8
|
8
|
6
|
4
|
6
|
5
|
6
|
4
|
|
120
|
150
|
0
|
-9
|
0
|
-9
|
9
|
7
|
5
|
7
|
5
|
7
|
5
|
![noise.png]()
Tolerance Data for Vibration of Single Bearing
|
D
|
V
|
V1
|
V2
|
V3
|
V4
|
|
mm
|
Low
|
Medium
|
High
|
Low
|
Medium
|
High
|
Low
|
Medium
|
High
|
Low
|
Medium
|
High
|
Low
|
Medium
|
High
|
|
3,4
|
80
|
44
|
44
|
60
|
35
|
32
|
48
|
26
|
22
|
31
|
16
|
15
|
28
|
10
|
10
|
|
5,6
|
110
|
72
|
60
|
74
|
48
|
40
|
58
|
36
|
30
|
35
|
21
|
18
|
32
|
11
|
11
|
|
7,8,9
|
130
|
96
|
80
|
92
|
66
|
54
|
72
|
48
|
40
|
44
|
28
|
24
|
38
|
12
|
12
|
|
10,12
|
160
|
120
|
100
|
120
|
80
|
70
|
90
|
60
|
50
|
55
|
35
|
30
|
45
|
14
|
15
|
|
15
|
210
|
150
|
120
|
150
|
100
|
85
|
110
|
78
|
60
|
65
|
46
|
35
|
52
|
18
|
18
|
|
17
|
210
|
150
|
120
|
150
|
100
|
85
|
110
|
78
|
60
|
65
|
46
|
35
|
52
|
25
|
25
|
|
20
|
260
|
190
|
150
|
180
|
125
|
100
|
130
|
100
|
75
|
80
|
60
|
45
|
60
|
25
|
25
|
|
22,25
|
260
|
190
|
150
|
180
|
125
|
100
|
130
|
100
|
75
|
80
|
60
|
45
|
60
|
30
|
32
|
|
28
|
260
|
190
|
150
|
180
|
125
|
100
|
130
|
100
|
75
|
80
|
60
|
45
|
60
|
35
|
40
|
|
30,32
|
300
|
240
|
190
|
200
|
150
|
130
|
150
|
120
|
100
|
90
|
75
|
60
|
70
|
35
|
40
|
|
35
|
300
|
240
|
190
|
200
|
150
|
130
|
150
|
120
|
100
|
90
|
75
|
60
|
70
|
42
|
45
|
|
40
|
360
|
300
|
260
|
240
|
180
|
160
|
180
|
150
|
130
|
110
|
90
|
80
|
82
|
50
|
50
|
|
45
|
360
|
300
|
260
|
240
|
180
|
160
|
180
|
150
|
130
|
110
|
90
|
80
|
82
|
60
|
60
|
|
50
|
420
|
320
|
320
|
280
|
200
|
200
|
210
|
160
|
160
|
125
|
100
|
100
|
95
|
70
|
70
|
Maximum Vibration Acceleration of Single Bearing
|
D
|
Diameter Series(0)
|
Diameter Series(2) |
Diameter Series(3) |
|
mm
|
Z
|
Z1
|
Z2
|
Z3
|
Z
|
Z1
|
Z2
|
Z3
|
Z4
|
Z
|
Z1
|
Z2
|
Z3
|
Z4
|
|
3
|
35
|
34
|
32
|
28
|
36
|
35
|
32
|
30
|
-
|
37
|
36
|
33
|
31
|
-
|
|
4
|
35
|
34
|
32
|
28
|
36
|
35
|
32
|
30
|
-
|
37
|
36
|
33
|
31
|
-
|
|
5
|
37
|
36
|
34
|
30
|
38
|
37
|
34
|
32
|
-
|
39
|
37
|
35
|
33
|
-
|
|
6
|
37
|
36
|
34
|
30
|
38
|
37
|
34
|
32
|
-
|
39
|
37
|
35
|
33
|
-
|
|
7
|
39
|
38
|
35
|
31
|
40
|
38
|
36
|
34
|
-
|
-
|
-
|
-
|
-
|
-
|
|
8
|
39
|
38
|
35
|
31
|
40
|
38
|
36
|
34
|
-
|
-
|
-
|
-
|
-
|
-
|
|
9
|
41
|
40
|
36
|
32
|
42
|
40
|
37
|
35
|
-
|
-
|
-
|
-
|
-
|
-
|
|
10
|
43
|
42
|
38
|
33
|
44
|
42
|
39
|
35
|
30
|
37
|
44
|
40
|
37
|
32
|
|
12
|
44
|
43
|
39
|
34
|
45
|
43
|
39
|
35
|
30
|
47
|
45
|
40
|
37
|
32
|
|
15
|
45
|
44
|
40
|
35
|
46
|
44
|
41
|
36
|
31
|
48
|
46
|
42
|
38
|
33
|
|
17
|
46
|
44
|
40
|
35
|
47
|
45
|
41
|
36
|
31
|
49
|
47
|
42
|
38
|
33
|
|
20
|
47
|
45
|
41
|
36
|
48
|
46
|
42
|
38
|
33
|
50
|
48
|
43
|
39
|
34
|
|
22
|
47
|
45
|
41
|
36
|
48
|
46
|
42
|
38
|
33
|
50
|
48
|
43
|
39
|
34
|
|
25
|
48
|
46
|
42
|
38
|
49
|
47
|
43
|
40
|
36
|
51
|
49
|
44
|
41
|
37
|
|
28
|
49
|
47
|
43
|
39
|
50
|
48
|
44
|
41
|
37
|
52
|
50
|
45
|
42
|
38
|
|
30
|
49
|
47
|
43
|
39
|
50
|
48
|
44
|
41
|
37
|
52
|
50
|
45
|
42
|
38
|
|
32
|
50
|
48
|
44
|
40
|
51
|
49
|
45
|
42
|
38
|
53
|
51
|
46
|
43
|
39
|
|
35
|
51
|
49
|
45
|
41
|
52
|
50
|
46
|
43
|
39
|
54
|
52
|
47
|
44
|
40
|
|
40
|
53
|
51
|
46
|
42
|
54
|
52
|
47
|
44
|
40
|
56
|
54
|
49
|
45
|
41
|
|
45
|
55
|
53
|
48
|
45
|
56
|
54
|
49
|
46
|
43
|
58
|
56
|
51
|
47
|
44
|
|
50
|
57
|
54
|
50
|
47
|
58
|
55
|
51
|
48
|
45
|
60
|
57
|
53
|
49
|
46
|
|
55
|
59
|
56
|
52
|
49
|
60
|
57
|
53
|
50
|
47
|
62
|
59
|
54
|
51
|
48
|
|
60
|
61
|
58
|
54
|
51
|
62
|
59
|
54
|
51
|
48
|
|
61
|
56
|
53
|
50
|
