Inconel 601 (UNS NO6601) pipe fittings (ASTM B366 standard) are manufactured to high-temperature and corrosion-resistant standards, typically following ASME B16.9 or B16.28 standards. Sizes range from 1/2 inch to 48 inches, with tolerances typically ranging from +5 mm to +0.005 mm, depending on the diameter and type of fitting (elbows, tees, reducers).
601 alloy pipe fittings tolerances
| All Fittings | 90, 45 Elbows and Tees | Reducers | Caps | 180 Returns | Angularity Tolerance | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nominal Pipe Size | Outside Diameter at Bevel | Inside Diameter at End | Wall Thickness | Center to End Dimension | Overall Length | Overall Length | Center to Center Dimension | Back to face Dimension | Alignment of Ends | Nominal Pipe Size | off Angle | off Plane |
| (in) | D | t | A.B.C.M | H | E | O | K | U | (in) | Q | P | |
| 1/2to 21/2 | +1.52-0.76 | 0.76 | Not Less Than 87.5% of Nominal Thickness | 1.52 | 1.52 | 3.05 | 6.35 | 6.35 | 0.76 | 1/2 to 4 | 0.76 | 1.51 |
| 3 to 31/2 | 1.52 | 1.52 | 1.52 | 1.52 | 3.05 | 6.35 | 6.35 | 0.75 | 5 to 8 | 1.52 | 3.05 | |
| 4 | 1.52 | 1.52 | 1.52 | 1.52 | 3.05 | 6.35 | 6.36 | 0.76 | 10 to 12 | 2.29 | 4.83 | |
| 5 to 8 | +2.29-1.52 | 1.52 | 1.52 | 1.52 | 6.35 | 6.35 | 6.35 | 0.76 | 14 to 16 | 2.29 | 6.35 | |
| 10 to 18 | +4.06-3.05 | 3.05 | 2.29 | 2.29 | 6.35 | 9.65 | 6.35 | 1.52 | 18 to 24 | 3.05 | 9.65 | |
| 20 to 24 | +6.35-4.83 | 4.83 | 2.29 | 2.29 | 6.35 | 9.65 | 6.35 | 1.52 | 26 to 30 | 4.83 | 9.65 | |
| 26 to 30 | +6.35-4.83 | 4.83 | 3.05 | 4.83 | 9.65 | – | – | – | 32 to 36 | 4.83 | 12.7 | |
| 32 to 36 | +6.35-4.83 | 4.83 | 4.83 | 4.83 | 9.65 | – | – | – | ||||
