Crank Angle Sensor Frequently Asked Questions
Question number FAQ-0002
It is stated that 'M5 high-tensile bolts should be used' for securing the customer-provided adapter to install the CP-5720A crank pulse detector onto the engine crank pulley, but is it not acceptable to use regular bolts, and which number of high-tensile bolts should be used?
Please be sure to use a high-strength bolt "10.9" of size M5. High-strength bolts can be purchased at the nearest screw handling store.
Generally, due to the high levels of vibration around the engine, high-tensile bolts made from SCM alloy are used to ensure a secure fastening. While the tightening force of a regular bolt is about 5.4 Nm, high-tensile bolts have a tightening force that is 10 to 100 times greater. Additionally, high-tensile bolts are classified by strength, and for installing this detector/adapter, using an M5 bolt with a commonly accepted strength grade of '10.9' is sufficient for secure fastening.
Note that the high-strength bolt "10.9" here is;
- 10：980N/mm2
- 9: The yield load represents 90% = 882N/mm 2.
Last updated: January 19, 2009