Complete ASME B16.5 flange standard specification guide: NPS 1/2 to 24, Class 150-2500, pressure-temp ratings, facings (RF, RTJ, FF), materials. Quote in 30 min.
ASME B16.5 is the globally dominant standard for steel pipe flanges and flanged fittings from NPS 1/2 through NPS 24. It defines strict dimensional interchangeability, pressure-temperature rating tables across Material Groups 1.1 through 3.17, and face finish standards.
ASME B16.5 covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings in sizes NPS 1/2 through NPS 24 metric/inch standard.
| Specification Parameter | ASME Standard Specification | European / Metric Equivalent |
|---|---|---|
| Size Scope | NPS 1/2" to 24" | DN 15 to DN 600 |
| Pressure System | Class 150 to 2500 | PN 2.5 to PN 400 |
| Facing Standard | RF (1.6mm / 6.3mm), RTJ | Type A, B, C, D, E, F |
| Gasket Standard | ASME B16.20 (Spiral Wound / RTJ) | EN 1514 / DIN 2690 |
A: ASME B16.5 covers pipe sizes up to NPS 24. For flanges NPS 26 and larger, ASME B16.47 Series A (MSS SP-44) or Series B (API 605) applies.
A: For Class 150 and 300, ASME B16.5 specifies a 1.6 mm (0.06 in.) Raised Face. For Class 400, 600, 900, 1500, and 2500, a 6.4 mm (0.25 in.) Raised Face is standard.
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