ASME B16.5
ASTM
ASTM A105 Blind Flange Class 150 Dimensions & Weight Chart (ASME B16.5)
Carbon Steel ASTM A105 / A105N · Class 150 · 1/2" to 24"
Dimensions & weight table
Reference values for layout and freight estimates. Confirm critical dimensions against the latest ASME edition and your project ITP before procurement.
| NPS | DN | OD (mm) | Wall (mm) | Flange OD (mm) | Bolt holes | Weight (kg) |
|---|---|---|---|---|---|---|
| 1/2" | 15 | 21.3 | 2.77 | 90 | 4 | 0.2 |
| 3/4" | 20 | 26.7 | 2.87 | 100 | 4 | 0.4 |
| 1" | 25 | 33.4 | 3.38 | 110 | 4 | 0.5 |
| 1-1/4" | 32 | 42.2 | 3.56 | 115 | 4 | 0.6 |
| 1-1/2" | 40 | 48.3 | 3.68 | 125 | 4 | 0.8 |
| 2" | 50 | 60.3 | 3.91 | 150 | 4 | 1.3 |
| 2-1/2" | 65 | 73 | 5.16 | 180 | 4 | 1.9 |
| 3" | 80 | 88.9 | 5.49 | 190 | 4 | 2.3 |
| 4" | 100 | 114.3 | 6.02 | 230 | 8 | 3.7 |
| 5" | 125 | 141.3 | 6.55 | 255 | 8 | 4.7 |
| 6" | 150 | 168.3 | 7.11 | 280 | 8 | 6.3 |
| 8" | 200 | 219.1 | 8.18 | 345 | 8 | 10.5 |
| 10" | 250 | 273.1 | 9.27 | 405 | 12 | 15.4 |
| 12" | 300 | 323.9 | 10.31 | 485 | 12 | 23.1 |
| 14" | 350 | 355.6 | 11.13 | 535 | 12 | 28.6 |
| 16" | 400 | 406.4 | 12.7 | 585 | 16 | 37.4 |
| 18" | 450 | 457.2 | 14.27 | 635 | 16 | 45.1 |
| 20" | 500 | 508 | 15.09 | 685 | 20 | 53.9 |
| 24" | 600 | 610 | 17.48 | 790 | 20 | 79.8 |
Material data
Chemical composition
- C
- ≤ 0.35 %
- Mn
- 0.60 – 1.05 %
- P
- ≤ 0.035 %
- S
- ≤ 0.040 %
- Si
- ≤ 0.35 %
Mechanical properties
- Tensile strength
- ≥ 485 MPa (70 ksi)
- Yield strength
- ≥ 250 MPa (36 ksi)
- Elongation
- ≥ 22 % (in 50 mm)
Manufacturing & quality assurance
Yanshan Hengzhenyuan Pipeline — integrated forming, heat treatment, machining and NDT for export utility and EPC programs.
Production capability
- Forged or plate blind flanges per ASME B16.5 Class 150
- RF facing; raised portion matches companion flange
- Used for line ends, maintenance isolation and hydro boundaries
- Figure-8 spectacles and ring spacers quoted from drawings
Inspection & release
- Flange OD, thickness and facing finish inspection
- PMI per heat; bolt hole pattern vs B16.5
- Pressure test certificates when blinds are in test packages
- Third-party inspection on EPC orders
Engineering FAQ
Blinds bolt to a companion flange for removable isolation. Caps are welded to pipe ends for permanent closure.
No. Blinds are solid except for optional jack screws or bleed holes specified on the drawing.
No. Match flange class and bolt/stud rating to the design pressure–temperature rating.
Figure-8 and paddle blinds are supplied from approved drawings with matching pressure class.
Quick RFQ
Include quantity, delivery port and required certificates. We respond with mill pricing and lead time.