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Standard size tolerances for forged products
A. Forged tolerances for rounds and squares
Size in mm Tolerance in mm
( + ) ( – )
Upto 75 2.0 Nil
76 to 125 4.0 Nil
126 to 175 6.0 Nil
176 to 275 12.5 Nil
Over 275 16.0 Nil
Note: Size denotes diameter for rounds and side for squares and distance between parallel faces for other
sections.
Special tolerances can also be mutually agreed.
B. Forged tolerances for Flats
Width of Flats Tolerance on Width in mm Tolerance on thickness in mm,
in mm for thickness 100 mm & above
( + ) ( – ) ( + ) ( – )
LFM
100 to 150 8.0 Nil 6.0 Nil
PRESS
150 to 250 12.5 Nil 6.0 Nil
251 to 400 25.0 Nil 8.0 Nil
400 & above 25.0 Nil 8.0 Nil

C. Forged tolerances for Die Blocks
Size in mm Tolerance in mm
( + ) ( – )
200 to 375 8.0 Nil
376 to 500 15.0 Nil
Tolerance on length 20.0 Nil
Note: Size denotes Thickness or Width

D.Size tolerances for Die Blocks in proof machined condition
On Width and Thickness + 5.0 mm, - 0
On Length + 20.0 mm, - 0

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