What should the torque be to tighten a threaded fastener?
Ensure that the tightening torque value is specified on the assembly drawing. Quotation of a plus or minus 5% tolerance is good practice. More unusually, quote that a calibrated torque wrench is to be used to check the torque after installation. The method used to tighten the bolt has a significant influence on the preload scatter (see below).
When do I need to de-rated my bolt torque?
Also, if the nut material is the limiting factor, the maximum clamping capability (and corresponding bolt torque) of the assembly needs to be de-rated accordingly.
How is a tap used to cut threads?
A tap cuts threads on the inner diameter of a hole, like a nut. There are a few main types of taps: These are the most commonly used taps as they are easiest to line up and start your threads. The have a gentle taper in the business end of the tap, which is used to center itself in the hole you are threading.
How much torque is lost during the tightening process?
It is estimated that only about 10% of the tightening torque actually results in useful bolt tensioning. The remaining 90% is lost due various forms of friction that occur during the tightening process. For these reasons, it is not practical to provide a single bolt torque chart or formula that is accurate for all situations.
What happens if your spindle nut is over torque?
It will also leave your spindle nut under or over torque resulting in hub assembly failure. Ensure that you have the correct torque for the application by referring to SKF 457377 torque specification guide or contact the vehicle manufactures dealer. It is important that you properly torque the spindle nut to ensure optimum bearing life.
How are lug nuts supposed to work when torqued?
How Do Lug Nuts Work? Lug nuts are designed to ‘stretch’ a certain amount when torqued to their factory-specified level. This stretch allows the nuts to make a strong mechanical connection to the threads on the lug.
Do you need a calibrated torque wrench to install an axle nut?
To guarantee the (Bearing, Spindle or Hub) is torqued correctly, follow the manufacture’s installation procedure. Ignoring these important details will reduce the life of your (Bearing, Spindle or Hub). Use a qualified, calibrated torque wrench. Do not use an impact gun to install the axle nut. The impact gun will damage the axle nut.
Where can I find the torque specification guide?
Ensure that you have the correct torque for the application by referring to SKF 457377 torque specification guide or contact the vehicle manufactures dealer. It is important that you properly torque the spindle nut to ensure optimum bearing life. Under torque of an axle nut will allow excessive movement causing uneven loading and excessive wear.