Tolerance Guidelines & Design
Welcome to Hitech
Home I Manufacturing Capabilities I Tolerance Guidelines & Design

Tolerances: We follow Indian Standard is: 11166:1993 class-2 or ISO: 2768 M for unspecified dimensions.

Unspecified Tolerances- is 11166:1993 class 2

Nominal Size (mm) Overall Dimension (mm)

Over

Up to

Up to 6

Over 6   Up to 10

Over 10 Up to 18

Over 18 Up to 30

Over 30 Up to 80

Over 80 Up to 180

Over 180 Up to 300

Over 300 Up to 500

 

 6

 ±0.10

 ±0.12

 ±0.15

 ±0.20

 ±0.25

 ±0.25

 ±0.30

 ±0.35

 6

 10

-

 ±0.12

 ±0.15

 ±0.25

 ±0.25

 ±0.30

 ±0.35

 ±0.45

 10

 18

-

-

 ±0.20

 ±0.30

 ±0.35

 ±0.35

 ±0.40

 ±0.55

 18

 30

-

-

-

 ±0.30

 ±0.40

 ±0.45

 ±0.50

 ±0.65

 30

 80

-

-

-

-

 ±0.45

 ±0.55

 ±0.60

 ±0.75

 80

 180

-

-

-

-

-

 ±0.60

 ±0.70

 ±0.90

 180

 300

-

-

-

-

-

-

 ±1.00

 ±1.15

 300

 500

-

-

-

-

-

-

-

 ±2.00

 

Unspecified Tolerances – ISO 2768(In mm)

Nominal
size
(mm)

Tolerance (mm)

Class

 

 0.5-3

 3-6

 6-30

 30-120

 120-400

 400-1000

 1000-2000

 2000-4000

F
(Fine)

 ±0.05

 ±0.05

 ±0.10

 ±0.15

 ±0.20

 ±0.30

 ±0.50

-

M
(Medium)

 ±0.10

 ±0.10

 ±0.20

 ±0.30

 ±0.50

 ±0.80

 ±1.20

 ±2

C
(Coarse)

 ±0.15

 ±0.20

 ±0.50

 ±0.80

 ±1.20

 ±2

 ±3

 ±4

V
(Very Coarse)

-

 ±0.50

 ±1

 ±1.5

 ±2.50

 ±4

 ±6

 ±8

Angular Tolerance: ±0.5°
Wall Thickness:        2.5 mm minimum for Ferrous Alloy
                                 1 mm for Aluminium alloys.
Fillet Radius:            0.5 mm


Design Guide Lines:

Cast Holes

Hole Diameter (mm) Maximum Length or Depth (mm)
D Through Hole Blind Hole

2-4

1.0*D

 0.6*D

4-6

2.0*D

 1.0*D

6-10

3.0*D

 1.6*D

>10

4.0*D

 2.0*D

 

Cast Slots

Width B
(mm)
Highest Depth
Open Closed

2-4

1*B

1.0*B

4-6

2*B

1.0*B

6-10

3*B

1.6*B

>10

4*B

2.0*B