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BALLS MAIN TECHNICAL PARAMETERS
Release time：2008/9/23 17:18:07
Tolorance/grade & technical requirement:
G
　		 Vdws Ball Dia Variation Sph Deviation From Spherical Form Surface Roughness Vdwl Lot Dia Variation Dia. Tolorance
Vdws △Sph Ra Vdwl Tdn
not over
um
10 0.25 0.25 0.025 0.5 *
16 0.4 0.4 0.032 0.8 *
20 0.5 0.5 0.05 1 *
28 0.7 0.7 0.05 1.5 *
40 1.0 1.0 0.08 2 *
60 1.5 1.5 0.10 3 *
100 2.5 2.5 0.125 5 ±12.5
200 5 5 0.2 10 ±25
500 13 13 * 25 ±50
1000 25 25 * 50 ±125
Steel Ball Vibrotechnique Requirement:
Precision grade
Vibration Group
Balls Diameter		 G20 G16 G10G5G3
　 　 　
Z1 Z2 Z3
Over To Meanvalue Singlevalue Meanvalue Singlevalue Meanvalue Singlevalue
4.5 6.5 39.5 41.5 37.5 39.5 35.5 37.5
6.5 7.5 40 42 38 40 36 38
7.5 10 40.5 42.5 38.5 40.5 36.5 38.5
10 11 42 44 40.5 42.5 36.5 40.5
11 12 42.5 44.5 41 43 39 41
121 13 43 45 41.5 43.5 39.5 41.5
13 14 43.5 45.5 42 44 40 42
14 15 44 46 42.5 44.5 40.5 42.5
15 16 44.5 46.5 43.5 44.5 40.5 42.5
16 17 45 47 43 45 41 43
17 17.5 45.5 47.5 43 45 41 43
Steel ball surface hardening:
Size least hardened layer
≥at least ＜at least 　
　
0.3 1.5 0.1
15 2.0 0.4
2.0 3.0 0.5
3.0 4.5 0.6
4.5 5.5 0.8
5.5 6.5 0.9
6.5 9.5 1.1
9.5 11.0 1.4
11.0 12.5 1.7
12.5 14.0 1.8
14.0 19.0 1.9
19.0 38.0 2.0
Vdwl Lot Dia Variation & Preferred Gauge,Subgauge:
G Vdwl Lot Dia Variation   Gauge Interval Preferred Gauge Subgauge Interval Subgauge
　 　 　 　 　
10 0.5 1 -9,…-1,0,+1,…+9 0.2 -0.4,-0.2,0,+0.2,+0.4
16 0.8 2 -10,…-2,0,+2,…,+10 0.4 -0.8,-0.4,0,+0.4,+0.8
20 1 2 -10,…,-2,0,+2,…,+10 0.4 -0.8,-0.4,0,+0.4,+0.8
28 1.4 2 -12,…-2,0,+2,…,+12 0.4 -0.8,-0.4,0,+0.4,+0.8
40 2 4 -16,…-4,0,+4,…,+16 0.8 -1.6,-0.8,0,+0.8,+1.6
60 3 5 -20,…,-5,0,+5,…,+20 1 -2,-1,0,+1,+2

Steel ball size conversion & weight table:
Dia. 1000pcs Per kilo balls Dia. 1000pcs Per kilo balls Dia. 1000pcs Per kilo balls
mm in Weight(kg) pieces(about)

　		 mm in Weight(kg) pieces(about) mm in Weight(kg) pieces(about)
0.5000 0.00051 1960780 8.0000 2.09 478 20.637013/16 35.8 27.9
0.6800 0.00128 781250 8.5000 2.5 400 21.0000 37.75 26.49
0.8000 0.00209 478470 8.731211/32 2.71 369 21.4313 27/32 40.1 24.9
1.0000 0.00408 245100 9.0000 2.97 337 22.2250 7/8 44.8 22.3
1.2000 0.00705 141840 9.5250 3/8 3.52 284 23.0000 49.95 20.17
1.3000 0.00893 111980 10.0000 4.08 245 23.0188 29/32 49.8 20.1
1.4500 0.0124 80645 10.3188 13/32 4.48 223 23.8125 15/16 55.1 18.2
1.5880 1/16 0.016 62350 11.0000 5.42 185 24.0000 56.34 17.75
1.7500 0.0218 45871 11.1125 7/16 5.60 179 24.6063 31/32 60.8 16.5
2.0000 0.0325 30700 11.5000 6.22 161 25.0000 63.68 15.70
2.3812 3/32 0.055 18182 11.5094 29/64 6.22 161 25.40000 1 66.89 15
2.5000 0.0637 15698 11.9062 15/32 6.88 145 26.9875 1/32 73.3 13.64
3.0000 0.110 9091 12.0000 7.04 142 26.9875 1/16 80.2 12.47
3.1750 1/8 0.131 7634 12.303131 /64 7.60 132 27.7812 1/32 87.4 11.4
3.5000 0.175 5717 12.7000 1/2 8.35 120 28.0000 89.47 11.18
3.9688 5/32 0.255 3922 13.4938 17/32 10.0 100 28.5750 1/8 95.2 10.50
4.0000 0.261 3831 14.0000 11.18 89 30.1625 1/16 112 8.93
4.7625 3/16 0.441 2268 14.2875 9/16 11.9 84.0 　 　 　
5.0000 0.510 1961 15.0812 19/32 14.0 71.4 　 　 　
5.1594 13/64 0.560 1786 14.8750 5/8 16.3 61.3 　 　 　
5.5562 7/32 0.699 1431 16.0000 16.69 59.9 　 　 　
5.9531 15/64 0.860 1163 16.6688 21/32 18.9 52.9 　 　 　
6.0000 0.881 1136 17.0000 20.02 50 　 　 　
6.3500 1/4 1.04 962 17.4625 11/16 21.7 46.1 　 　 　
6.5000 1.119 894 18.2562 23/32 24.8 40.3 　 　 　
6.7469 17/64 1.25 800 19.0000 27.96 35.77 　 　 　
7.1438 9/32 1.49 671 19.0500 3/4 28.2 355
7.9372 5/16 2.04 490 19.8438 25/32 31.9 31.4
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