17mm.
The Heli 3 ton forklift engine oil pan screws are external hex flange screws and are general purpose screws: Model: M12x20, so use a wrench of 17mm.
Wrenches are mainly tools used for tightening hexagonal, square screws and various nuts. Made of tool steel, alloy steel or malleable cast iron.
Use a screw torque tester to test.
The characteristics of the torque tester are as follows:
1. It can be connected to 120 or 350Ω biaxial strain gauges.
2. Bridge connection method: full bridge
3. Auto sample rate: 10Hz
4. Stress measurement range: 0～±60000με,
5. Deformation resolution: 0.1 με.
6. Temperature drift: 0.5με/℃ typ.
7. Time drift: 0.5με/4h
8. Long wire compensation can be used to eliminate stray wiressystem caused by wire resistance.
9. Minimum torque resolution: 0.1 N*m
Detailed information
Important components
Sensor torque
< p>The torque sensor is an electronic device similar to a load. It is mainly used to convert the torque value obtained by test into an electrical torque signal. This conversion is indirect and is generally carried out in two steps. Through mechanical induction, the torque deformation of the strain gauge is detected, and the strain gauge deformation in the strain gauge is converted into an electrical signal. Torque transducers are typically configured in four strain gauge configurations, with one or two strain gauge torque transducers also available.The output of electrical signals is usually between a few millivolts, so it usually needs to be amplifiedby an instrumentation amplifier before it can be used. The sensor transmits and then applies an algorithm to calculate the data, then transmits it back to the sensor screen. Torque sensors are generally of the rotary type. Fixed and integrated reactive types are available for calibration and auditing purposes.
Digital display
A key element of modern torque testers is the digital display. The digital display is used to detect the sensor output signal and calculate the torque value to display on the screen. In most cases, the display and transducer are attached in a unit called a "desktop torque tester." External rotary and fixed sensors are available for portable displays (handheld torque instruments).
Baidu Encyclopedia-Screw Torque Tester