Torque Break Strength Test
Torque breaking strength test of our ceramics screws.
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How strong is a ceramic screw? They are harder than general metal screws and they break down as soon as a small clack occers. Here show you the torque break test result of Hexagon bolts each sizes and each materials (alumina and zirconia). (It is not certified value.)
1. Results of ceramic screw torque testing.
[ Torque breake strength data of Hexagon Bolt ]
| Material | M2 | M3 | M4 | M5 | M6 | M8 | M10 |
|---|---|---|---|---|---|---|---|
| Almina (Al2O3) N·m | 0.10 | 0.3 | 0.8 | 2.0 | 5.2 | 10.2 | 12< |
| Zirconia (ZrO2) N·m | 0.13 | 0.7 | 1.2 | 4.6 | 5.6 | 12< | 12< |
※ Refer below for the test conditions.
Attention 2: Those are not "Tightening Torque" but "Breakage Torque".
Attention 3: Those are changed by environment of use.
※ In our test, we fixed a ceramic screw by two acrylic plates pasted on two vice's walls, and mesured a value of break torque. (refer to 3 Diagram.)
※ If you buy some ceramics screws, first please try a few screws and confirm the tightening torque.After the test, please tighten remaining ones by adequate torque.
2. Test conditions
| Test screws |
Hexagon bolt (Alumina)： M2, M3, M4, M5, M6, M8, M10 Hexagon bolt (Zirconia)： M2, M3, M4, M5, M6, M8, M10 |
|---|---|
| Method | Refer to Dia.1 below. |
| Gauge | Round dial gauge torque screw driver / wrench [KANON] 10DPSK / 20DPSK / N50DPSK / N12TOK |
| Location | In our facility [Temperature 23°C] |
| Date | 2016/09/28 |
3. Diagram of test setup
[ Preparation ]
Fixed a ceramics hexagon bolt in a vice.
At this time, bonded two acrylic plates to inside faces of a vice (for a bolt is not damaged and not slip.) with making a space 0 to 5mm between bolt neck and vice top.
[ Testing ]
After the preparation above, turned bolt's head by a torque driver slowly and at a constat speed. And mesured a torque value in a moment when a bolt was broken and calcurated the mean value.