Tri-clamp heat shield washer: 0.6 mm, ½ to 4 in tube — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-heat-shield/  (CC BY 4.0)
Basis: Washer: bore = flange OD (C3), OD = clamp OD + 16, 0.6 mm thick
Catalog version: 2026-10-20

Sizes: see table below
- A flat washer that slides over a ferrule rim (bore = flange OD) and rests on the hot-end clamp, so the flame's plume is turned away from the tube and the parts above the hot joint.
- Bore = flange OD (25.0 / 50.5 / 64.0 / 77.5 / 91.0 / 119.0); OD = clamp OD + 16 (Ø50 / 75.5 / 89 / 102.5 / 116 / 144), 0.6 mm thick.
- It goes on from the open end of the spool before the cold-end head and its clamp; it drops down the tube onto the hot clamp.

size_in  bore_mm  od_mm  thickness_mm
¾  25.0  50.0  0.6
1½  50.5  75.5  0.6
2  64.0  89.0  0.6
2½  77.5  102.5  0.6
3  91.0  116.0  0.6
4  119.0  144.0  0.6

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- ISO: ISO 2852:1993 Stainless steel clamp pipe couplings for the food industry — standard — ISO [verify license at link] — https://www.iso.org/standard/7873.html
- Long Earth Society: Tri-clamp Stirling engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/tri-clamp-heat-shield/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-heat-shield