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ASME B16.5 Flanges – Dimensional Tolerances Welding Neck Flanges

Grade   Certificate  Plate thickness

in mm

 

Width in mm
Length in mm
O

 

Outside Diameter When O is 24″ or less. When O is over 24″. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm
R
Diameter of Contact Face 0.06″ (1.6 mm) raised face. 0.25″ (6.4 mm) raised face. ±0.03″ ±0.02″ ±0.8 mm ±0.5mm
A Diameter of Hub at Point of Welding NPS 5 and smaller. NPS 6 and larger. +0.09″, -0.03″ +0.16″, -0.03″ +2.4 mm, -0.8mm +4.0 mm, -0.8 mm
B Inside Diameter NPS 10, 12, 18, 20 and larger. +0.03″ +0.06″ +0.12″, -0.06″ +0.8 mm +1.6 mm +3.2 mm, -1.6 mm
X Diameter of Hub at Base Hub Base is 24″or less. Hub Base is over 24″. +0.06″ +0.12″ +1.6 mm +3.2 mm
C Thickness NPS 18 and smaller. NPS 20 and larger. +0.12″ +0.19″ +3.2 mm +4.8 mm
  Drilling and Facings Bolt circle diameter Bolt Hole Spacing ±0.06″ ±0.03″ ±1.6 mm ±0.8 mm
  Eccentricity of Bolt Circle and Facing NPS 2 1/2 and smaller. NPS 3 and larger. ±0.03″ ±0.06″ ±0.8 mm ±1.6 mm
  Length Through Hub NPS 10 and smaller. NPS 12 and larger. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm

Slip-on, Lap Joint, Socket Welding and Threading Flanges

Grade   Certificate  Plate thickness in mm Width in mm
Length in mm
O

 

Outside Diameter When O is 24″ or less. When O is over 24″. ±0.06″ ±0.12″ ±1.6 mm ±3.2 mm
R
Facings 0.06″ (1.6 mm) raised face. 0.25″ (6.4 mm) raised face. ±0.03″ ±0.02″ ±0.8 mm ±0.5mm
B
Inside Diameter at face of Socket Welding Flanges NPS 10 and smaller. NPS 12 to 18, inclusive. NPS 20 and larger. ±0.03″ ±0.06″ +0.12″, -0.06″ ±0.8 mm ±1.6 mm +3.2 mm, -1.6 mm

Q

Counterbore, Threaded Flanges NPS 10 and smaller NPS 12 and larger +0.03″ +0.06″ +0.8 mm +1.6 mm
X Diameter of Hub at Base NPS 12″ and smaller. NPS 14″ and larger. +0.09″, -0.06″ ±0.12″ +2.4 mm -1.6 mm ±3.2 mm
C Thickness NPS 18 and smaller. NPS 20 and larger. +0.12″ +0.19″ +3.2 mm +4.8 mm
  Drilling Bolt Circle Diameter Bolt Hole Spacing ±0.06″ ±0.03″ ±1.6 mm ±0.8 mm
  Eccentricity of Bolt Circle and Facing NPS 2 1/2 and smaller. NPS 3 and larger. ±0.03″ ±0.06″ ±0.8 mm ±1.6 mm
  Length Through Hub NPS 18 and smaller. NPS 20 and larger. +0.12″, -0.03″ +0.19″, -0.03″ +3.2 mm, -0.8 mm +4.8 mm, -1.6 mm

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