LARGE DIAMETER FLANGES ASME B16.47 ASME B16.36

DIMENSIONAL TOLERANCES

LARGE DIAMETER FLANGES

ASME B16.47

O Outside Diameter* ±0.12″ ±3.2 mm
R Diameter of Contact face

0.06″ (1.6 mm) raised face

0.25″ (6.4 mm) raised face 

±0.08″

±0.04″

±2.0 mm

±1.2 mm

A Diameter of Hub at Point of Welding +0.21″, -.0.06″ +5.5 mm, -1.6 mm
B Inside Diameter +0.12″, -0.06″ +3.2 mm, -1.6 mm
C Thickness

Up to  1.0″ thickness

1.0″ to 2.0″

2.0″ to 3.0″

Over 3.0″ thickness

+0.12″, -0.00″

+0.19″, -0.00″

+0.31″, -0.00″

+0.38″, -.0.00″

+3.2 mm, -0.00 mm

+4.8 mm, -0.00 mm

+7.9 mm, -0.00 mm

+9.6 mm, -0.00 mm

 

Drilling

Bolt Circle Diameter

Bolt Hole Spacing

±0.06″

±0.03″

±1.6 mm

±0.8 mm

Eccentricity of Bolt Circle

and Facing with Respect to Bore 

±0.06″ ±1.6″
Length Through Hub for Welding Neck Flanges  ±0.19″ ±4.8″

* Not an ASME tolerance

 

DIMENSIONS OF RING JOINT FACING ASME B16.47