ASME B16.20 / B16.21 Metallic / non-metallic gaskets
CurrentLatest edition found. Still confirm amendments with the publisher.
- Edition
- ASME B16.20 2023; ASME B16.21 2021
- Publisher
- ASME
- Part family
- Pipes, flanges & gaskets
- Reviewed
- 23 October 2026 · source checked
Is ASME B16.20 / B16.21 still current?
Yes. ASME B16.20 2023; ASME B16.21 2021 is the latest edition MechAtlas found (MechAtlas review: 23 October 2026). Check the publisher for amendments before you specify it.
What it covers
Metallic / non-metallic gaskets
Equivalent and related standards
| Standard | Relationship | Note |
|---|---|---|
| EN 1514 | Similar purpose — not interchangeable without an engineering check |
“Similar” never means interchangeable without an engineering check.
Parts that use ASME B16.20 / B16.21
- Flange gasket (USA (ASME / ASTM), main)
Seal placed between two flange faces; types include flat sheet, spiral wound and metal ring joint.
Spiral wound gasket NPS 4 Class 300, 316/graphite, ASME B16.20
Grades: Class 150 to 2500
B16.20 metallic (ring joint, spiral wound); B16.21 non-metallic flat.
Official source
MechAtlas does not reproduce standards. Check the official edition at the publisher's page for ASME B16.20 / B16.21 or the ASME store.
Open in MechAtlasCheck a drawing callout
Other pipes, flanges & gaskets standards
- DIN 2633 Replaced
Weld-neck flanges PN 16 (old DIN) - IS 13159-1 Withdrawn
Pipe flanges, dimensions - EN 10217-1 Changing
Welded pressure tubes, room temperature - EN 1092-1 Changing
Steel flanges, PN designated - API 5L Current
Line pipe - ASME B16.47 Current
Large flanges NPS 26–60, Series A and B (do not mate) - ASME B16.5 Current
Pipe flanges & flanged fittings - ASME B16.9 Current
Wrought butt-welding fittings - ASME B16.9 / B16.11 Current
Butt-weld / forged socket-weld & threaded fittings - ASME B36.10 Current
Welded & seamless wrought steel pipe - ASME B36.19 Current
Stainless steel pipe dimensions - ASTM A106 / A53 / A312 Current
Seamless CS / general / stainless pipe