ASME B16.47 Series A · ASTM A105 · stock and made to order
38″ Class 400 Weld Neck Flange — ASME B16.47 Series A
38″ Class 400 weld neck flange to ASME B16.47 Series A, machined from ASTM A105. Outside diameter 1206 mm, thickness 124 mm, 32 bolt holes on a 1117.6 mm circle, approximate weight 424 kg. Available with raised face, flat face or the facing specified on your drawing.
Size
38″ / DN950
Standard
ASME B16.47 Series A (ASME B16.47-2025, Series A)
Pressure rating
Class 400
Outside diameter
1206 mm (47.48″)
Thickness
124 mm (4.88″)
Bolt circle
1117.6 mm (44″)
Approx. weight
424 kg
Full dimensions — 38″ Class 400
| Size | DN | OD | Thickness | RF Ø | Bolt circle | Bolts | Hub Ø | Length | Weight | |
|---|---|---|---|---|---|---|---|---|---|---|
| 26″ | 650 | 972 mm (38.27″) | 88.9 mm (3.5″) | 749 mm (29.49″) | 876.3 mm (34.5″) | 28 × Ø47.6 mm (1.87″) | 727 mm (28.62″) | 194 mm (7.64″) | 295 kg | Details → |
| 28″ | 700 | 1035 mm (40.75″) | 95.3 mm (3.75″) | 800 mm (31.5″) | 939.8 mm (37″) | 28 × Ø50.8 mm (2″) | 783 mm (30.83″) | 206 mm (8.11″) | 356 kg | Details → |
| 30″ | 750 | 1092 mm (42.99″) | 101.6 mm (4″) | 857 mm (33.74″) | 997 mm (39.25″) | 28 × Ø54 mm (2.13″) | 837 mm (32.95″) | 219 mm (8.62″) | 411 kg | Details → |
| 32″ | 800 | 1149 mm (45.24″) | 108 mm (4.25″) | 914 mm (35.98″) | 1054.1 mm (41.5″) | 28 × Ø54 mm (2.13″) | 889 mm (35″) | 232 mm (9.13″) | 483 kg | Details → |
| 34″ | 850 | 1206 mm (47.48″) | 111.3 mm (4.38″) | 965 mm (37.99″) | 1104.9 mm (43.5″) | 28 × Ø54 mm (2.13″) | 945 mm (37.2″) | 241 mm (9.49″) | 544 kg | Details → |
| 36″ | 900 | 1270 mm (50″) | 114.3 mm (4.5″) | 1022 mm (40.24″) | 1168.4 mm (46″) | 32 × Ø54 mm (2.13″) | 1000 mm (39.37″) | 251 mm (9.88″) | 608 kg | Details → |
| 38″ (this size) | 950 | 1206 mm (47.48″) | 124 mm (4.88″) | 1035 mm (40.75″) | 1117.6 mm (44″) | 32 × Ø47.6 mm (1.87″) | 1003 mm (39.49″) | 206 mm (8.11″) | 424 kg | Details → |
| 40″ | 1000 | 1270 mm (50″) | 130 mm (5.12″) | 1092 mm (42.99″) | 1174.8 mm (46.25″) | 32 × Ø50.8 mm (2″) | 1054 mm (41.5″) | 216 mm (8.5″) | 494 kg | Details → |
| 42″ | 1050 | 1321 mm (52.01″) | 133.4 mm (5.25″) | 1143 mm (45″) | 1225.6 mm (48.25″) | 32 × Ø50.8 mm (2″) | 1108 mm (43.62″) | 224 mm (8.82″) | 540 kg | Details → |
| 44″ | 1100 | 1384 mm (54.49″) | 139.7 mm (5.5″) | 1200 mm (47.24″) | 1282.7 mm (50.5″) | 32 × Ø54 mm (2.13″) | 1159 mm (45.63″) | 233 mm (9.17″) | 624 kg | Details → |
| 46″ | 1150 | 1441 mm (56.73″) | 146.1 mm (5.75″) | 1257 mm (49.49″) | 1339.8 mm (52.75″) | 36 × Ø54 mm (2.13″) | 1213 mm (47.76″) | 244 mm (9.61″) | 692 kg | Details → |
| 48″ | 1200 | 1511 mm (59.49″) | 152.4 mm (6″) | 1308 mm (51.5″) | 1403.4 mm (55.25″) | 28 × Ø60.3 mm (2.37″) | 1267 mm (49.88″) | 257 mm (10.12″) | 812 kg | Details → |
| 50″ | 1250 | 1568 mm (61.73″) | 157.2 mm (6.19″) | 1362 mm (53.62″) | 1460.5 mm (57.5″) | 32 × Ø60.3 mm (2.37″) | 1321 mm (52.01″) | 268 mm (10.55″) | 885 kg | Details → |
| 52″ | 1300 | 1619 mm (63.74″) | 162.1 mm (6.38″) | 1413 mm (55.63″) | 1511.3 mm (59.5″) | 32 × Ø60.3 mm (2.37″) | 1372 mm (54.02″) | 276 mm (10.87″) | 964 kg | Details → |
| 54″ | 1350 | 1702 mm (67.01″) | 169.9 mm (6.69″) | 1470 mm (57.87″) | 1581.2 mm (62.25″) | 28 × Ø66.7 mm (2.63″) | 1425 mm (56.1″) | 289 mm (11.38″) | 1163 kg | Details → |
| 56″ | 1400 | 1753 mm (69.02″) | 174.8 mm (6.88″) | 1527 mm (60.12″) | 1632 mm (64.25″) | 32 × Ø66.7 mm (2.63″) | 1480 mm (58.27″) | 298 mm (11.73″) | 1229 kg | Details → |
| 58″ | 1450 | 1803 mm (70.98″) | 177.8 mm (7″) | 1578 mm (62.13″) | 1682.8 mm (66.25″) | 32 × Ø66.7 mm (2.63″) | 1530 mm (60.24″) | 306 mm (12.05″) | 1465 kg | Details → |
| 60″ | 1500 | 1886 mm (74.25″) | 185.7 mm (7.31″) | 1635 mm (64.37″) | 1752.6 mm (69″) | 32 × Ø73 mm (2.87″) | 1584 mm (62.36″) | 319 mm (12.56″) | 1733 kg | Details → |
Published ASME B16.47 Series A dimensions for every Class 400 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 A.
What Class 400 means in service
Series A follows the former MSS SP-44 dimensions. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressures read from the B16.47 pressure–temperature tables for the material group and design temperature.
Series A follows the former MSS SP-44 dimensions. Ratings are ASME classes 150, 300, 400, 600 and 900, with allowable pressures read from the B16.47 pressure–temperature tables for the material group and design temperature.
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. Flat face (FF) and ring-type joint (RTJ) faces are available against the 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 A table for 38″ Class 400
- 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 400
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38″ Class 400 Weld Neck Flange
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