Tri-clamp bearing cap: 2 in cap with a long Ø3 shaft bore and two 623 seats — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-bearing-cap/  (CC BY 4.0)
Basis: ISO 2852 clamp face and 20° back exactly as the flat end cap on this site (gen_hardware.tc_cap); 623 bearing 3 × 10 × 4 (ISO 15); bore length and spigot are design values
Catalog version: 2026-10-20

Sizes: see table below
- A cap for a 2 in ferrule face that lets a thin crankshaft out of a crankcase that holds working gas. The face, the 1.6 mm recess and the 20° back cone are the flat end cap's, so the standard clamp and Type B gasket close it like any cap.
- On the gas side a Ø16 spigot runs 77.1 mm in from the face: through the gasket lip and through the Ø16 bore of the branch plug to the crank chamber. A 623 seat (Ø10 × 4) at the spigot end carries the shaft next to the crank; a second 623 seat in the back carries it next to the flywheel.
- Between the two seats the shaft runs in a Ø3 bore 75.1 mm long. That close running fit is the only way out for the gas: no seal, no O-ring, so almost no friction.
- Fits: Ø3 bore run on the Ø3 shaft; seats press on the 623 outer ring; spigot slide in the plug bore; the face is a clamp face.

feature  value
face  ISO 2852, 2 in (Ø64 flange)
flat back  Ø46.7 at 6
spigot  Ø16 × 77.1 from the face
bearing seats  2 × Ø10 × 4 (623)
shaft bore  Ø3 × 75.1 (run)

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, 1 parts): https://xemstudio.com/files/hardware/tri-clamp-bearing-cap/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-bearing-cap