Buick Regal 1997-2000

Bolts, Nuts, & Other Threaded Retainers


Although there are a great variety of fasteners found in the modern car or truck, the most commonly used retainer is the threaded fastener (nuts, bolts, screws, studs, etc.). Most threaded retainers may be reused, provided that they are not damaged in use or during the repair. Some retainers (such as stretch bolts or torque prevailing nuts) are designed to deform when tightened or in use and should not be reinstalled.

Whenever possible, we will note any special retainers which should be replaced during a procedure. But you should always inspect the condition of a retainer when it is removed and replace any that show signs of damage. Check all threads for rust or corrosion which can increase the torque necessary to achieve the desired clamp load for which that fastener was originally selected. Additionally, be sure that the driver surface of the fastener has not been compromised by rounding or other damage. In some cases a driver surface may become only partially rounded, allowing the driver to catch in only one direction. In many of these occurrences, a fastener may be installed and tightened, but the driver would not be able to grip and loosen the fastener again. This could lead to difficulties at a later date should that component ever need to be disassembled again.

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Fig. There are many different types of threaded retainers found on vehicles

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Fig. Threaded retainer sizes are determined using these measurements

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Fig. Metric bolt identification and the types of prevailing torque fasteners that may be found on your GM vehicle

If you must replace a fastener, whether due to design or damage, you must ALWAYS be sure to use the proper replacement. Care must be taken when obtaining replacement fasteners to make sure they will fit properly. There are different thread pitches on metric fasteners and the they must not be mixed. In all cases, a retainer of the same design, material and strength should be used. Markings on the heads of most bolts will help determine the proper strength of the fastener. The same material, thread and pitch must be selected to assure proper installation and safe operation of the vehicle afterwards.

Thread gauges are available to help measure a bolt or stud's thread. Most automotive and hardware stores keep gauges available to help you select the proper size. Another way to check threads is to use another nut or bolt of known size, for a thread gauge. If the bolt being replaced is not too badly damaged, select a match by finding another bolt which will thread in its place. If you find a nut which threads properly onto the damaged bolt, then use that nut to help select the replacement bolt. If, however, the bolt being replacing is so badly damaged (broken or drilled out) that its threads cannot be used as a gauge, look for another bolt (from the same assembly or a similar location on your vehicle) which will thread into the damaged bolt's mounting. If the other bolt can be used as a sample to select a nut; the nut can then be used to select the replacement bolt. In all cases, be absolutely sure you have selected the proper replacement.

Be aware that when you find a bolt with damaged threads, you may also find the nut or drilled hole it was threaded into has also been damaged. If this is the case, you may have to drill and tap the hole, replace the nut or otherwise repair the threads. NEVER try to force a replacement bolt to fit into the damaged threads.