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Varies by manufacturer.
17mm bolt and nut
Gauges to allow a person to calculate nut bolt size are widely available. Measuring the thread manually can be unreliable so it is far preferable to use a gauge.
If you are referring to the tensioner pulley's nut size, it is usually a metric 15mm nut.
It is probably a 19mm. The best way to find out is to go to the parts/hardware store and thread the lug nut onto a bolt and which ever size bolt it fits that will be the size of the lug nuts.
To calculate wrench size you measure across the flat surfaces of the nut or bolt, then pick a wrench marked with that size. Be careful, there are metric and SAE nuts and bolts and some wrenches are close but not right. -For instance you should not use a 1/2" wrench on a 12 mm nut. -It may look right, but will round the edges of the nut.
There are several bolt and nut sizes associated with the 1997 Chevrolet truck bed. The bolt and not sizes range from a half inch to three-quarter inches.
How is a nut like a bolt
The bolt pattern is 5x5. The lug nut size for the stud thread is 14mm x 1.50
bolt: 5x100 oe size: 15x6.5 lug nut: 14mmx1.5b cb: 57.1
2"
Gauges to allow a person to calculate nut bolt size are widely available. Measuring the thread manually can be unreliable so it is far preferable to use a gauge.