Tri-clamp end caps with a welded boss (fabrication spec): 2 in cap with a ¾ in ferrule, ¾ in cap with a 1/4 NPT boss — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-caps-with-welded-boss/  (CC BY 4.0)
Basis: 16AMP end-cap profile and ISO 2852 faces as gen_sanitary.cap; ¾ in tube Ø19.05 × 1.65 and ferrule; 1/4 NPT tap drill 7/16 in (ASME B1.20.1) with the thread drawn as its drill, the convention of this site's thread envelopes
Catalog version: 2026-10-20

Sizes: see table below
- 2 in cap with a ¾ in ferrule: a standard 2 in cap with a ¾ in tube welded on its axis, ending 25.4 mm out in a full ¾ in ferrule, bored Ø15.75 through. It turns a 2 in end into a ¾ in clamp end without a reducer, clear of the 2 in clamp.
- ¾ in cap with a 1/4 NPT boss: a standard ¾ in cap with a Ø19 boss welded on, tapped 1/4 NPT; a gauge, a fill valve or a relief valve screws in.
- Both are things a sanitary fabricator makes from a drawing: a cap, a short tube or a boss, one weld.
- Fits: faces are clamp faces; the NPT hole is a taper thread (drawn at its tap drill).

file  base  added  bore
cap-2in-x-0.75in-ferrule  2 in cap  ¾ in ferrule on a 25.4 stub  Ø15.75
cap-0.75in-x-1-4npt  ¾ in cap  Ø19 × 12 boss  1/4 NPT, Ø4 through

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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
- 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: ASME B1.20.1 pipe threads (NPT): 1/4 NPT tap drill 7/16 in (11.1 mm) as on this site's thread envelopes — standard — dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/b1-20-1-pipe-threads-general-purpose-inch
- 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-caps-with-welded-boss/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-caps-with-welded-boss