ASME B16.47 Series B · ASTM A105 · stock and made to order
34″ Class 150 Weld Neck Flange — ASME B16.47 Series B
34″ Class 150 weld neck flange to ASME B16.47 Series B, machined from ASTM A105. Outside diameter 1005 mm, thickness 47.8 mm, 40 bolt holes on a 957.3 mm circle, approximate weight 95.3 kg. Available with raised face, flat face or the facing specified on your drawing.
Size
34″ / DN850
Standard
ASME B16.47 Series B (ASME B16.47-2025, Series B)
Pressure rating
Class 150
Outside diameter
1005 mm (39.57″)
Thickness
47.8 mm (1.88″)
Bolt circle
957.3 mm (37.69″)
Approx. weight
95.3 kg
Full dimensions — 34″ Class 150
| Size | DN | OD | Thickness | RF Ø | Bolt circle | Bolts | Hub Ø | Length | Weight | |
|---|---|---|---|---|---|---|---|---|---|---|
| 26″ | 650 | 786 mm (30.94″) | 39.9 mm (1.57″) | 711 mm (27.99″) | 744.5 mm (29.31″) | 36 × Ø22.2 mm (0.87″) | 684 mm (26.93″) | 87 mm (3.43″) | 54.4 kg | Details → |
| 28″ | 700 | 837 mm (32.95″) | 42.9 mm (1.69″) | 762 mm (30″) | 795.3 mm (31.31″) | 40 × Ø22.2 mm (0.87″) | 735 mm (28.94″) | 94 mm (3.7″) | 63.5 kg | Details → |
| 30″ | 750 | 887 mm (34.92″) | 42.9 mm (1.69″) | 813 mm (32.01″) | 846.1 mm (33.31″) | 44 × Ø22.2 mm (0.87″) | 787 mm (30.98″) | 98 mm (3.86″) | 68 kg | Details → |
| 32″ | 800 | 941 mm (37.05″) | 44.5 mm (1.75″) | 864 mm (34.02″) | 900.1 mm (35.44″) | 48 × Ø22.2 mm (0.87″) | 840 mm (33.07″) | 106 mm (4.17″) | 77.1 kg | Details → |
| 34″ (this size) | 850 | 1005 mm (39.57″) | 47.8 mm (1.88″) | 921 mm (36.26″) | 957.3 mm (37.69″) | 40 × Ø25.4 mm (1″) | 892 mm (35.12″) | 109 mm (4.29″) | 95.3 kg | Details → |
| 36″ | 900 | 1057 mm (41.61″) | 50.8 mm (2″) | 972 mm (38.27″) | 1009.6 mm (39.75″) | 44 × Ø25.4 mm (1″) | 945 mm (37.2″) | 116 mm (4.57″) | 109 kg | Details → |
| 38″ | 950 | 1124 mm (44.25″) | 52.6 mm (2.07″) | 1022 mm (40.24″) | 1069.8 mm (42.12″) | 40 × Ø28.6 mm (1.13″) | 997 mm (39.25″) | 122 mm (4.8″) | 132 kg | Details → |
| 40″ | 1000 | 1175 mm (46.26″) | 54 mm (2.13″) | 1080 mm (42.52″) | 1120.6 mm (44.12″) | 44 × Ø28.6 mm (1.13″) | 1049 mm (41.3″) | 127 mm (5″) | 141 kg | Details → |
| 42″ | 1050 | 1226 mm (48.27″) | 57.2 mm (2.25″) | 1130 mm (44.49″) | 1171.4 mm (46.12″) | 48 × Ø28.6 mm (1.13″) | 1102 mm (43.39″) | 132 mm (5.2″) | 156 kg | Details → |
| 44″ | 1100 | 1276 mm (50.24″) | 58.9 mm (2.32″) | 1181 mm (46.5″) | 1222.2 mm (48.12″) | 52 × Ø28.6 mm (1.13″) | 1153 mm (45.39″) | 135 mm (5.31″) | 141 kg | Details → |
| 46″ | 1150 | 1341 mm (52.8″) | 60.5 mm (2.38″) | 1235 mm (48.62″) | 1284.3 mm (50.56″) | 40 × Ø31.8 mm (1.25″) | 1205 mm (47.44″) | 143 mm (5.63″) | 197 kg | Details → |
| 48″ | 1200 | 1392 mm (54.8″) | 63.5 mm (2.5″) | 1289 mm (50.75″) | 1335.1 mm (52.56″) | 44 × Ø31.8 mm (1.25″) | 1257 mm (49.49″) | 148 mm (5.83″) | 218 kg | Details → |
| 50″ | 1250 | 1443 mm (56.81″) | 66.7 mm (2.63″) | 1340 mm (52.76″) | 1385.9 mm (54.56″) | 48 × Ø31.8 mm (1.25″) | 1308 mm (51.5″) | 152 mm (5.98″) | 236 kg | Details → |
| 52″ | 1300 | 1494 mm (58.82″) | 68.3 mm (2.69″) | 1391 mm (54.76″) | 1436.7 mm (56.56″) | 52 × Ø31.8 mm (1.25″) | 1360 mm (53.54″) | 156 mm (6.14″) | 236 kg | Details → |
| 54″ | 1350 | 1549 mm (60.98″) | 69.9 mm (2.75″) | 1441 mm (56.73″) | 1492.2 mm (58.75″) | 56 × Ø31.8 mm (1.25″) | 1413 mm (55.63″) | 161 mm (6.34″) | 281 kg | Details → |
| 56″ | 1400 | 1600 mm (62.99″) | 71.6 mm (2.82″) | 1492 mm (58.74″) | 1543 mm (60.75″) | 60 × Ø31.8 mm (1.25″) | 1465 mm (57.68″) | 165 mm (6.5″) | 295 kg | Details → |
| 58″ | 1450 | 1675 mm (65.94″) | 73.2 mm (2.88″) | 1543 mm (60.75″) | 1611.3 mm (63.44″) | 48 × Ø34.9 mm (1.37″) | 1516 mm (59.69″) | 173 mm (6.81″) | 354 kg | Details → |
| 60″ | 1500 | 1726 mm (67.95″) | 74.6 mm (2.94″) | 1600 mm (62.99″) | 1662.1 mm (65.44″) | 52 × Ø34.9 mm (1.37″) | 1570 mm (61.81″) | 178 mm (7.01″) | 386 kg | Details → |
Published ASME B16.47 Series B dimensions for every Class 150 size in this product family.
Dimensions in millimetres; the inch equivalent is shown in brackets. Bolt hole diameter applies to through-holes. For stud length, gasket and bolting selection, match the gasket and bolts to B16.47 B.
What Class 150 means in service
Series B follows the former API 605 dimensions, with a smaller outside diameter and a different bolt pattern from Series A. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressure from the B16.47 tables.
Series B follows the former API 605 dimensions, with a smaller outside diameter and a different bolt pattern from Series A. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressure from the B16.47 tables.
Facing and materials
Raised face (RF) is standard: 1.5 mm high for Classes 75, 150 and 300; 6.4 mm for Classes 400, 600 and 900. FF and RTJ faces are available to drawing.
- ASTM A105 / A105N
- ASTM A350 LF2
- ASTM A182 F304/F316L
- ASTM A694 F52/F60/F65
- ASTM A182 F51/F53
Other grades, impact-tested heats and NACE MR0175 requirements are quoted on request. Material certificates to EN 10204 3.1 are issued against the same heat number as the dimensional report.
Inspection and delivery
- Dimensional inspection against the B16.47 B table for 34″ Class 150
- Heat number stamped on the rim; EN 10204 3.1 certificate issued
- PMI on stainless and alloy heats; UT/RT on request
- Anti-rust oil, plywood case or pallet, with packing list and MTC
- Typical lead time 7–15 days for carbon steel stock sizes, 20–30 days for alloys
Other sizes in Class 150
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34″ Class 150 Weld Neck Flange
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