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. |
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