Dimensional Tolerances (ASME)
ASME B16.9, B16.28
Pipe Size | All Fittings | 90 & 45 Elbows and Tees | Reducers and Lap Joint Stub ends | Caps | |||||||
Outside Diameter at Bevel, D (1) | Inside Diameter at End (1) | Wall Thickness t | Center-to-End Dimensions A,B,C,M | Overall Length, F,H | |||||||
Overall Length, E | |||||||||||
IN | MM | IN | MM | IN | MM | IN | MM | IN | MM | ||
½ ~ 2½ | +0.06 | +1.6 | ±0.03 | ±0.8 | Not Less Than 87.5% of Nominal Thickness | ±0.06 | ±2 | ±0.06 | ±2 | ±0.12 | ±3 |
-0.03 | -0.8 | ||||||||||
3 ~ 2½ | ±0.06 | ±1.6 | ±0.06 | ±1.6 | |||||||
4 | |||||||||||
5 ~ 8 | +0.09 | +2.4 | ±0.25 | ±6 | |||||||
-0.06 | -1.6 | ||||||||||
10 ~ 18 | +0.16 | +4.0 | ±0.12 | ±3.2 | ±0.09 | ±0.09 | |||||
-0.12 | -3.2 | ||||||||||
20 ~ 24 | +0.25 -0.19 | +6.4 -4.8 | ±0.19 | ±4.8 | |||||||
26 ~ 30 | ±0.12 | ±3 | ±0.19 | ±5 | ±0.38 | ±10 | |||||
32 ~ 48 | ±0.19 | ±5 |
Pipe Size | Lap Joint Stub Ends (2) | 180 Return Bends | ||||||||||
Outside Diameter of Lap, G | Lap Thickness | Fillet Radius of Lap, R | Center-to-Center Dimension, O | Back-to- Face Dimension, K | Alignment of Ends, U | |||||||
IN | MM | IN | MM | IN | MM | IN | MM | IN | MM | IN | MM | |
½ ~ 2½ | +0 -0.03 | +0 -1 | +0.06 -0 | +1.6 -0 | +0 -0.03 | +0 -1 | ±0.25 | ±6 | ±0.25 | ±6 | ±0.03 | ±1 |
3 ~ 2½ | ||||||||||||
4 | +0 -0.06 | +0 -2 | ||||||||||
5 ~ 8 | ||||||||||||
10 ~ 18 | +0 -0.06 | +0 -2 | +0.12 -0 | +3.2 -0 | ±0.38 | ±10 | ±0.06 | ±2 | ||||
20 ~ 24 |
Pipe Size | Off Angle, Q | Off Plane, P | ||
IN | MM | IN | MM | |
½ ~ 4 | ± 0.03 | ± 1 | ± 0.06 | ± 2 |
5 ~ 8 | ± 0.06 | ± 2 | ± 0.12 | ± 4 |
10 ~ 12 | ± 0.09 | ± 0.19 | ± 5 | |
14 ~ 16 | ± 3 | ± 0.25 | ± 6 | |
18 ~ 24 | ± 0.12 | ± 4 | ± 0.38 | ± 10 |
26 ~ 30 | ± 0.19 | ± 5 | ||
32 ~ 42 | ± 0.50 | ± 13 | ||
44 ~ 48 | ± 0.75 | ± 19 |
NOTES:
(1) Out-of-round is the sum of absolute values of plus and minus tolerances.
(2) Outside diameter of barrel see the table on page 15.