Machinery's Handbook, 31st Edition
742
V-Block Types Table 10. Accuracy of Grade 1 and Grade 2 V-Blocks, BS 3731:1987
Permitted Deviations
Flatness of Working Faces, µ m
End and Side Faces, Squareness to the Base, µ m
Parallelism of “V” Axis to Base and Side Faces, µ m
Matching Tolerance over “V” Length, µ m
Parallelism of Opposite Faces, µ m
Squareness of “V” Axis to End Face, µ m
Equality of “V” Flank Angle, minutes
Designating Size, mm
“V” Centrality, µ m
Grade 1
20 25 40 50 63 75 80 85
2 2 3 3 4 5 5 5 6 8
4 4 6 6 8
4 4 6 6 8
2 2 4 4 6 8 8 8
2 2 4 4 6 8 8 8
1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 2 2
4 4 6 6 8
2 2 3 3 4 5 5 5 6 8
10 10 10 12 16 20 24 10 14 14 26 34 34 34 38 8 40 42 46
10 10 10 12 16 20 24 10 14 14 26 34 34 34 38 8 40 42 46
10 10 10 12 16 20 24
100 125 160 200
10 14 18 22 10 14 14 26 8 34 34 34 38 40 42 46
10 14 18 22 10 14 14 26 8 34 34 34 38 40 42 46
10 12
10 12
Grade 2
20 25 40 50 63 75 80 85
6 6 8 8
6 8
4 4 6 6 8
10 10 18 22 22 22 24 24 26 28
12 16 16 16 18 24 26 28
10 10 10 12 16 20
100 125 160 200
24 Note: Intermediate sizes should be made to the accuracy specified for the next smaller designated size. Double V-blocks should be made to the accuracy specified for the larger designating size. Recommended General Dimensions for Steel, Cast Iron, and Granite V-Blocks BS 3731 Max Dia., mm Width A , mm Height B , mm Length C , mm Max Dia., mm Width A , mm Height B , mm Length C , mm Cast Iron Hollow V-Block Solid Steel or Cast Iron 63 80 60 35 40 50 40 25 80 100 75 40 85 100 70 50 100 130 90 45 Solid Granite V-Block 125 150 100 50 50 75 75 75 160 180 130 60 75 100 100 100 200 220 160 70 85 150 150 150 Double V-Block 125 200 200 200 20 and 25 32 32 42 20 and 40 40 40 50
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