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