ASME B16.5 — Class 900 bolting and approximate weights
ASME B16.5 Class 900 bolting and approximate weights — 19 sizes.
| NPS | Studs — No. | Stud dia — in (in) | Stud length — Raised face (mm) | Stud length — Ring joint (mm) | Weld neck — kg, approx. (kg) | Slip-on — kg, approx. (kg) | Blind — kg, approx. (kg) |
|---|---|---|---|---|---|---|---|
| ½" | 4 | ¾" | 110 | 110 | — | 1.8 | 1.8 |
| ¾" | 4 | ¾" | 115 | 115 | — | 2.3 | 2.7 |
| 1" | 4 | ⅞" | 125 | 125 | 4.1 | 3.4 | 3.7 |
| 1¼" | 4 | ⅞" | 125 | 125 | 4.5 | 4.3 | 4.1 |
| 1½" | 4 | 1" | 140 | 140 | 6.4 | 5.5 | 5.9 |
| 2" | 8 | ⅞" | 145 | 145 | 11.3 | 10 | 10.1 |
| 2½" | 8 | 1" | 160 | 160 | 16.3 | 16.3 | 15.9 |
| 3" | 8 | ⅞" | 145 | 145 | 13.6 | — | 13.2 |
| 4" | 8 | 1⅛" | 170 | 170 | 24 | 24 | 24 |
| 5" | 8 | 1¼" | 190 | 190 | 39 | 38 | 39 |
| 6" | 12 | 1⅛" | 190 | 195 | 50 | 50 | 52 |
| 8" | 12 | 1⅜" | 220 | 220 | 84 | 78 | 90 |
| 10" | 16 | 1⅜" | 235 | 235 | 121 | 111 | 132 |
| 12" | 20 | 1⅜" | 255 | 255 | — | 148 | 188 |
| 14" | 20 | 1½" | 275 | 280 | — | 181 | 235 |
| 16" | 20 | 1⅝" | 285 | 290 | — | 200 | 276 |
| 18" | 20 | 1⅞" | 325 | 335 | — | 282 | 391 |
| 20" | 20 | 2" | 350 | 360 | — | 344 | 493 |
| 24" | 20 | 2½" | 440 | 455 | — | 651 | 932 |
- Dimensions are in millimetres unless stated otherwise.
- Flange thickness tf and length through hub Y do not include the 7 mm raised face.
- Blind flanges have the same outside diameter, thickness tf and drilling as the other flange types of the same size and class.
- In ASME B16.5, Class 900 flanges NPS ½" to 2½" use Class 1500 dimensions.
- The bore of a weld neck or socket weld flange is machined to match the inside diameter of the pipe schedule stated in the order.
- Bolt holes are tabulated in inches in ASME B16.5; the millimetre values shown are direct conversions (bolt diameter plus ⅛").
- Stud bolt lengths do not include the height of the points. Weights are approximate catalogue values and vary with bore and manufacturer.