Ceramic Screws standard

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 1: The torque data mentioned above are not certified value. Those are for reference. 
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.

Attention 4: Those are value of Hexagon bolts.

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

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.

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