PN 25 (Table 22 weld-neck + Table 25 blind) 250 thickness, neck and drilling — IS 6392
PN 25 (Table 22 weld-neck + Table 25 blind) 250 thickness, neck and drilling to IS 6392: a — pipe od 273 mm, d — flange od 425 mm, c — weld neck 32 mm, n — hub / neck dia 298 mm, d1 — raised face 335 mm.
Dimensions of PN 25 (Table 22 weld-neck + Table 25 blind) 250 thickness, neck and drilling
| Symbol | Dimension | Value |
|---|---|---|
| · | A — Pipe OD | 273 mm (10.748 in) |
| · | D — Flange OD | 425 mm (16.732 in) |
| · | C — Weld neck | 32 mm (1.260 in) |
| · | N — Hub / neck dia | 298 mm (11.732 in) |
| · | d1 — Raised face | 335 mm (13.189 in) |
| · | f — RF height | 3 mm (0.118 in) |
| · | K — Bolt circle | 370 mm (14.567 in) |
| · | n — Bolts | 12 |
| · | L — Hole dia | 30 mm (1.181 in) |
| · | Bolt — Size | M27 |
| · | C — Blind | 32 mm (1.260 in) |
SKU TSH-FLANGE-IS-6392-THICKNESS-NECK-AND-DRILLING-250 · Standard IS 6392 · teshi-web
Purchase description
PN 25 (TABLE 22 WELD-NECK + TABLE 25 BLIND), 250, THICKNESS, NECK AND DRILLING, ASTM A105N, IS 6392
Available materials: ASTM A105N, ASTM A350 LF2 Cl 1, ASTM A182 F304/304L, ASTM A182 F316/316L, ASTM A182 F11 Cl 2, ASTM A182 F22 Cl 3, ASTM A182 F51 (Duplex), ASTM A182 F53 (Super Duplex), ASTM A694 F52 / F60, IS 2062 E250 (plate).
Notes
- All dimensions are in millimetres.
- The PN 25 tables start at DN 175; for DN 10–150 IS 6392 refers to the PN 40 dimensions.
- IS 6392 drilling follows the ISO/DIN metric series, so IS 6392 flanges generally mate with EN 1092-1 / DIN flanges of the same PN — check the raised face and thickness for your flange type.
- Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.
Other sizes — PN 25 (Table 22 weld-neck + Table 25 blind), thickness, neck and drilling
Frequently asked questions
What are the main types of pipe flanges?
Weld neck (WN), slip-on (SO), blind (BL), socket weld (SW), threaded (THD), lap joint (LJ) and plate flanges. Special types include orifice, long weld neck, reducing flanges and spectacle blinds.
When should I use a weld neck flange instead of a slip-on?
Use weld neck flanges for high pressure, high or cycling temperature, and lines with vibration or fatigue loading. The tapered hub and full-penetration butt weld spread stress smoothly. Slip-on flanges are cheaper and easier to align, but their fatigue life is roughly one third of a WN.
What does Class 150, 300 or 600 mean on a flange?
The ASME class is a pressure-rating designation, not a pressure in psi. The allowable pressure depends on the material group and temperature. A Class 150 A105 flange is rated 19.6 bar at 38 °C but 13.8 bar at 200 °C.
Is a 150# flange rated for 150 psi?
No. A Class 150 carbon-steel flange is rated about 285 psi (19.6 bar) at ambient temperature, and about 170 psi (11.7 bar) at 260 °C. The "150" is a class number.