Split probe clamps for Ø3, Ø4.8, Ø6 probes and Ø8 / Ø9.53 dial-indicator stems — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/probe-clamps/  (CC BY 4.0)
Basis: Common probe sizes: DS18B20 sleeve Ø6 × 50, K-type sheathed Ø3 / Ø4.8 (3/16 in); dial-indicator stems Ø8 (metric) / Ø9.53 (3/8 in); M3 pinch at ISO 273 clearance
Catalog version: 2026-10-20

Sizes: see table below
- Each clamp is a 20 mm tall block, (bore + 10) × (bore + 12), with the bore at the probe or stem diameter exactly, a 1.2 mm pinch split from the bore to one edge, and a Ø3.4 (M3 clearance) pinch-screw hole crossing the split 3.5 mm outside the bore.
- DS18B20 waterproof probes have a Ø6 × 50 mm sleeve (a 30 mm version exists) and read −55 to 125 °C, so they belong on the cold side.
- K-type sheathed probes are Ø3 or Ø4.8 (3/16 in) × 100–150 mm and read to about 1100 °C; bare-bead K-type (0.3–1 mm wire) goes to about 1000 °C.
- Dial-indicator stems are Ø8 mm (metric) or Ø9.53 mm (3/8 in); I clamp one on the displacer rod to measure stroke while turning the engine by hand.

clamp  bore_mm  body_mm  for
probe-clamp-k-type-3mm  3  13 × 15 × 20  K-type Ø3
probe-clamp-k-type-4-8mm  4.8  14.8 × 16.8 × 20  K-type 3/16 in
probe-clamp-ds18b20-6mm  6  16 × 18 × 20  DS18B20 sleeve
probe-clamp-dial-indicator-8mm  8  18 × 20 × 20  metric indicator stem
probe-clamp-dial-indicator-3-8in  9.53  19.53 × 21.53 × 20  3/8 in indicator stem

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Thermocouple — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Thermocouple
- Wikipedia: Hall effect sensor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hall_effect_sensor
- Wikipedia: Dial indicator — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Dial_indicator
- Analog Devices: DS18B20 datasheet — PDF — Manufacturer datasheet — https://www.analog.com/en/products/ds18b20.html
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 5 parts): https://xemstudio.com/files/hardware/probe-clamps/index.json
API: https://xemstudio.com/api/geometry?object=probe-clamps