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Tolerances of Flanges

The socket welding flange derives it name socket weld as the flange has bore and counter bore where in the matching pipe slips on. The Inside diameter of the pipe and the smaller bore of flanges matches amicably to navigate smooth flow and. While the outside diameter of pipe matches perfectly with the bigger bore of flange or the groove of flange to be welded properly to create leak free assembly both from welding inside and by welding outside.

DIMENSIONS TOLERANCES OF FLANGES (in mm)
  Welding neck         Threaded, Slip on lap joint,
Socket welding and blind
   
* outside diameter O.D. 600 if smaller  
+ 1.6
_
         
    O.D. over 600  
+ 3.1
_
* outside diameter O.D. 600 or smaller  
+ 1.6
_
              O.D. over 600  
+ 3.1
_
                   
    250 and smaller  
+ 0.7
_
  inside diameter threaded : to stand gauge limit  
  inside diameter 12 though 450  
+ 1.6
_
  (bore) slop on .lap joint : socket-welding  
  (bore) 500 and larger
+ 3.1
- 1.6
    250 and smaller
+ 0.7
- 0.0
              300 and larger
+ 1.6
- 0.0
                   
    1.6 raised face
+ 0.4
_
      threaded    
  diameter of 6.3 raised face tounge &       diameter of 250 and smaller
+ 0.7
- 0.0
  contact face groove male and female
+ 0.4
_
    counter bore 300 and larger
+ 1.6
- 0.0
                   
          * outside diameter 300 and smaller
+ 2.3
- 1.6
* diameter of hub 125 and smaller
+ 2.2
- 0.7
  of hub 350 and larger  
+ 3.1
_
  at point of weding 150 and larger
+ 4.0
- 0.7
         
            diameter of 1.6 raised face  
+ 0.7
_
            contact face 6.3 raised fact tongue & grooved  
  Thickness 450 and smaller
+ 3.1
- 0.0
    male & female  
+ 0.4
_
    500 and larger
+ 4.7
- 0.0
         
            Thickness 450 and smaller
+ 3.1
- 0.0
  length through 250 and smaller  
+ 1.6
_
  hub 500 and larger
+ 4.7
- 0.0
  hub 300 and larger  
+ 3.1
_
         
          * length through 450 and smaller
+ 3.0
- 1.6
            hub 500 and larger
+ 4.8
- 1.6
  bolt circle 600 and smaller  
+ 0.7
_
         
    600 and larger  
+ 1.6
_
    bolt circle  
+ 1.6
_
                   
  drilling bolt hole spacing  
+ 0.7
_
         
            drilling bolt hole spacing  
+ 0.7
_
                   
  eccenticity with respect         eccenticity with respect      
  to bore     0.70 max   to bore     0.70 max