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Hole tolerance zones.

Post by ffbing, 2009-6-25, Views:

Hole tolerance zones.

The tolerance zone is defined as a spherical zone limited by the upper and lower limit dimensions of the part. The tolerance zone is therefore determined by the amount of the tolerance and its position related to the basic size. The position of the tolerance zone, related to the basic size (zero line), is determined in the ISO system by a so-called basic deviation. The system ISO defines 28 classes of basic deviations for holes. These classes are marked by capital letters (A, B, C, ... ZC). The tolerance zone for the specified dimensions is prescribed in the drawing by a tolerance mark, which consists of a letter marking of the basic deviation and a numerical marking of the tolerance grade (e.g. H7, H8, D5, etc.). This paragraph includes graphic illustrations of all tolerance zones of a hole which are applicable for the specified basic size [1.1] and the tolerance grade IT chosen from the pop-up list. 

Though the general sets of basic deviations (A ... ZC) and tolerance grades (IT1 ... IT18) can be used for prescriptions of hole tolerance zones by their mutual combinations, in practice only a limited range of tolerance zones is used. An overview of tolerance zones for general use can be found in the following table. The tolerance zones not included in this table are considered special zones and their use is recommended only in technically well-grounded cases.

Prescribed hole tolerance zones for routine use (for basic sizes up to 3150 mm):

               

B8

C8

A9

B9

C9

A10

B10

C10

A11

B11

C11

A12

B12

C12

A13

B13

C13

         
         

 

E5

CD6

D6

E6

CD7

D7

E7

CD8

D8

E8

CD9

D9

E9

CD10

D10

E10

 

D11

 

 

D12

 

 

D13

 

         
    EF3

F3

EF4

F4

EF5

F5

EF6

F6

EF7

F7

EF8

F8

EF9

F9

EF10

F10

               
    FG3

G3

FG4

G4

FG5

G5

FG6

G6

FG7

G7

FG8

G8

FG9

G9

FG10

G10

               
H1 H2 H3 H4 H5 H6 H7 H8 H9 H10 H11 H12 H13 H14 H15 H16 H17 H18
JS1 JS2 JS3 JS4 JS5 JS6 JS7 JS8 JS9 JS10 JS11 JS12 JS13 JS14 JS15 JS16 JS17 JS18
     

K3

 

K4

 

K5

J6

K6

J7

K7

J8

K8

                   
    M3

N3

M4

N4

M5

N5

M6

N6

M7

N7

M8

N8

M9

N9

M10

N10

 

N11

             
    P3 P4 P5 P6 P7 P8 P9 P10                
    R3 R4 R5 R6 R7 R8 R9 R10                
    S3 S4 S5 S6 S7 S8 S9 S10                
        T5

U5

T6

U6

T7

U7

T8

U8

 

U9

 

U10

               
        V5

X5

 

V6

X6

Y6

V7

X7

Y7

V8

X8

Y8

 

X9

Y9

 

X10

Y10

               
          Z6

ZA6

Z7

ZA7

Z8

ZA8

Z9

ZA9

Z10

ZA10

Z11

ZA11

             
            ZB7

ZC7

ZB8

ZC8

ZB9

ZC9

ZB10

ZC10

ZB11

ZC11

             

Note: Tolerance zones with thin print are specified only for basic sizes up to 500 mm. 

Hint: For hole tolerances, tolerance zones H7, H8, H9 and H11 are used preferably.

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Tags: tolerances 
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