Tri-clamp diaphragm membrane: flat, 1.5 and 2 in clamped size — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-diaphragm-membrane/  (CC BY 4.0)
Basis: ISO 2852 Type B gasket section for the clamped ring (bead 5.5 to the groove diameter, web 1.7), ASME BPE bore for the free span; free-span thickness and stretch are design values
Catalog version: 2026-10-20

Sizes: see table below
- The membrane is drawn flat, as it sits at mid-stroke. Outside the bore it has the Type B gasket section, so it is clamped like a gasket: bead 5.5 thick from the bore out to the groove diameter (Ø43.5 / Ø56.5), web 1.7 out to flange − 1. Inside the bore it is a 1.0 mm free span.
- Free span: from the centre-disc edge to the bore, 8.90 mm (1.5 in, Ø17 disc) and 13.75 mm (2 in, Ø20 disc). At the design stroke the span forms a cone of 29.3° / 28.6° and stretches 14.7 / 13.9 %.
- Swept volume with a rigid centre disc is the frustum between the disc edge and the bore: V = s · π/3 · (R² + R r + r²); see the table.
- Three Ø2.4 holes for the M2 screws that clamp the centre and backing discs.

size_in  od_mm  bead_to_mm  free_span_dia_mm  free_t_mm  bead_mm  web_mm  disc_dia_mm  annulus_mm  stroke_mm  cone_deg  stretch_pct  swept_ml
2  63.0  56.5  47.5  1.0  5.5  1.7  20.0  13.75  15.0  28.6  13.9  14.16
1.5  49.5  43.5  34.8  1.0  5.5  1.7  17.0  8.9  10.0  29.3  14.7  5.48

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- ISO (via iTeh sample): ISO 2852 clamp liners: face profile and flange / groove diameters — PDF — standard excerpt; dimensions are facts — https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf
- ASME: BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/tri-clamp-diaphragm-membrane/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-diaphragm-membrane