Mechanical Engineering Community

• entries
366
1,396
• views
858,091

# State the difference between Unilateral and Bilateral Tolerance?

75,199 views

State the difference between Unilateral and Bilateral Tolerance?

1. You can answer this question

2. You can like the best answer

3. You can share the question...

In Bilateral tolerance the limit dimensions are given above and below the nominal size..

In unilateral tolerance the limit dimensions are only above the nominal size OR only below the nominal size.

When you consider the Basic Size, lets say 120 mm, and if tolerance is only allowed for upper range i.e 120+ mm,(or only bottom range, i.e. 120-......mm) then that becomes Unilateral. When both sides are considered, 120+.....mm and 120-.....mm, that's the Bilateral tolerance.

For Bilateral, example is 120mm(+72,-126 where tolerances are in microns)

what is nominal size?

In Unilateral Tolerance, the limit vary above or below the Basic Size of object.  Whereas,

In Bilateral Tolerance, the limit vary above and below the Basic size of object.

In Industries, Unilateral tolerance is widely used as it is easier to calculate only in one direction.

in unilateral tolerance,the dimension of the part is allowed to vary on one side only. it may be either upper or lower of  basic line. but in bilateral tolerance,dimension is allowed to vary in both side.the dimension variance in both side may or may  not be same.

×   Pasted as rich text.   Paste as plain text instead

Only 75 emoji are allowed.