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Stainless steel balls (Full ball and Hollow ball) are primarily manufactured from Austenitic (300 series) or Martensitic (400 series) alloys, combining iron with chromium ((>10.5%)), nickel, and molybdenum for corrosion resistance and durability. Common materials include AISI 304/316 (corrosion-resistant, non-magnetic) and AISI 420/440C (hardened, magnetic), used in bearings, valves, and polishing.
Metric Diameter Dw (mm) Inch Diameter Dw (mm)
0.3 mm   0.30000 1/32   0.79375
0.4 mm   0.40000 3/64   1.19062
0.5mm   0.50000 1/16   1.58750
0.6mm   0.60000 5/64   1.98438
0.7mm   0.70000 3/32   2.38125
  0.8mm   0.80000 7/64   2.77812
1mm   1.00000 1/8   3.17500
1.2mm   1.20000 9/64   3.57188
1.5mm   1.50000 5/32   3.96875
2mm   2.00000 3/16   4.76250
2.5mm   2.50000 7/32   5.55625
2.8mm   2.80000 15/64   5.95312
3mm   3.00000 1/4   6.35000
3.5mm   3.50000 17/64   6.74688
4mm   4.00000 9/32   7.14375
4.5mm   4.50000 5/16   7.93750
5mm   5.00000 11/32   8.73125
5.5mm   5.50000 3/8 9.52500
6mm   6.00000 13/32 10.31875
6.5mm   6.50000 7/16 11.11250
7mm   7.00000 15/32 11.90625
7.5mm   7.50000 1/2 12.70000
  8mm 8.00000 17/32 13.49375
8.5mm   8.50000 9/16 14.28750
  9mm   9.00000 19/32 15.08125
10mm 10.00000 5/8 15.87500
11 mm 11.00000 21/32 16.66875
11.5mm 11.50000 11/16 17.46250
12mm 12.00000 23/32 18.25625
13mm 13.00000 3/4 19.05000
14 mm 14.00000 25/32 19.84375
15mm 15.00000 13/16 20.63750
16mm 16.00000 27/32 21.43125
17mm 17.00000 7/8 22.22500
18mm 18.00000 29/32 23.01875
19mm 19.00000 15/16 23.81250
20mm 20.00000 31/32 24.60625
21mm 21.00000 1 25.40000
22 mm 22.00000 11/16 26.9875
23mm 23.00000 11/8 28.57500
24 mm 24.00000 1 - 1/16" 26.98800
25mm 25.00000 1 - 1/8" 28.57500
26mm 26.00000 1 - 3/16" 30.16300
28mm 28.00000 1 - 1/4" 31.75000
30mm 30.00000 1 - 5/16" 33.33800
32mm 32.00000 1 - 3/8" 34.92500
34mm 34.00000 1 - 7/16" 36.51300
35mm 35.00000 1 - 1/2" 38.10000
36mm 36.00000 1.9/16" 39.68800
38mm 38.00000 1.5/8" 41.27500
40mm 40.00000 1.11/16" 42.86300
45mm 45.00000 1.3/4" 44.45000
50mm 50.00000 1.13/16" 46.03800
55mm 55.00000 1.7/8" 47.62500
60mm 60.00000 1.15/16" 49.21200
2" 50.80000
2.1/8" 53.97500
2.1/4" 57.15000
2.3/8" 60.32500
2.1/2" 63.50000