APPROXIMATE EQUIVALENT GRADES BETWEEN ISO 3290, AFBMA, DIN AND OLD "RGP" GRADES

ISO 3290
Grade AAAA
Grade AAA
Grade AA
Grade A
Grade B
Grade C
Ø (mm)
Grade 5
Grade 10
Grade 16
Grade 28
Grade 40
Grade 100
Ø ≤ 3
Grade 10
Grade 16
Grade 28
Grade 40
Grade 100
Grade 100
3 < Ø ≤ 6
Grade 10
Grade 16
Grade 28
Grade 40
Grade 100
Grade 200
6 < Ø ≤ 10
Grade 16
Grade 20
Grade 28
Grade 40
Grade 100
Grade 200
10 < Ø ≤ 20
-
Grade 28
Grade 40
Grade 100
Grade 200
-
20 < Ø ≤ 30
-
Grade 40
Grade 40
Grade 100
Grade 200
-
30 < Ø ≤ 50
-
Grade 40
Grade 100
Grade 100
Grade 200
-
Ø > 50
AFBMA
Grade AAAA
Grade AAA
Grade AA
Grade A
Grade B
Grade C
Ø (mm)
Grade 5
Grade 10
Grade 16
Grade 24
Grade 48
Grade 100
Ø ≤ 3
Grade 10
Grade 16
Grade 24
Grade 48
Grade 100
Grade 100
3 < Ø ≤ 6
Grade 10
Grade 16
Grade 24
Grade 48
Grade 100
Grade 200
6 < Ø ≤ 10
Grade 16
Grade 16
Grade 24
Grade 48
Grade 100
Grade 200
10 < Ø ≤ 20
-
Grade 24
Grade 48
Grade 100
Grade 200
Grade 300
20 < Ø ≤ 30
-
Grade 48
Grade 48
Grade 100
Grade 200
Grade 300
30 < Ø ≤ 50
-
Grade 48
Grade 100
Grade 100
Grade 200
Grade 300
Ø > 50
DIN
Grade AAAA
Grade AAA
Grade AA
Grade A
Grade B
Grade C
Ø (mm)
-
Class I
Class II
Class III
Class IV
-
Ø ≤ 3
-
Class I
Class II
Class III
Class IV
-
3 < Ø ≤ 6
Class I
Class II
Class III
Class IV
-
-
6 < Ø ≤ 10
Class I
Class II
Class III
Class IV
-
-
10 < Ø ≤ 20
Class II
Class II
Class III
Class IV
-
-
20 < Ø ≤ 30
-
-
Class III
Class IV
-
-
30 < Ø ≤ 50
-
-
Class III
Class IV
-
-
Ø > 50
Revision n.1