ISO 3290

Grade Ball Dia. Variation
(µm)
Deviation from Spherical Form
(µm)
Surface Roughness
(µm)
Lot Dia. Variation
(µm)
Gauge Interval
(µm)
Preferred Gauge
(µm)
Subgauge Interval
(µm)
Subgauge
(µm)
G3 0.08 0.08 0.010 0.13 0.5 -5...-0.5 0 +0.5...+5 0.1 -0.2,-0.1, 0, +0.1,+0.2
G5 0.13 0.13 0.014 0.25 1 -5...-1 0 +1...+5 0.2 -0.4,-0.2, 0, +0.2,+0.4
G10 0.25 0.25 0.020 0.5 1 -9...-1 0 +1...+9 0.2 -0.4,-0.2, 0, +0.2,+0.4
G16 0.4 0.4 0.025 0.8 2 -10...-2 0 +2...+10 0.4 -0.8,-0.4 0, +0.4,+0.8
G20 0.5 0.5 0.032 1 2 -10...-2 0 +2...+10 0.4 -0.8,-0.4 0, +0.4,+0.8
G24 0.6 0.6 0.040 1.2 2 -12...-2 0 +2...+12 0.4 -0.8,-0.4 0, +0.4,+0.8
G28 0.7 0.7 0.050 1.4 2 -12...-2 0 +2...+12 0.4 -0.8,-0.4 0, +0.4,+0.8
G40 1 1 0.060 2 4 -16...-4 0 +4...+16 0.8 -1.6,-0.8, 0, +0.8,+1.6
G60 1.5 1.5 0.080 3 6 -18...-6 0 +6...+18 1.2 -2.4,-1.2, 0. +1.2,+2.4
G100 2.5 2.5 0.100 5 10 -40...-10 0 +10...+40 2 -4,-2, 0, +2,+4
G200 5 5 0.150 10 15 -60...-15 0 +15...+60 3 -6,-3, 0, +3,+6