It's a measure of the strength of the bolt. The strength is measured using what's called a grade. In this case, you have a grade 8 bolt. The higher the number, the stronger the bolt.
5/8
3/8
It's TENSILE strength and on metric bolts it is indicated by a number.
I hope you mean a 5/8 bolt (58 inches would take a machine to turn). Measure your bolt head across the opposing flats. For a 5/8 bolt it may be 1 inch or even larger. The last one I did was in a truck's shock mounting and that took a 1.25 inch socket.
It's the number of threads per inch
The 1996 Toyota Camry head bolt size is 5/8 by four inches. There will be eight head bolts in each head.
The 2001 Daewoo head bolts are 5/8 by 5 1/2 inches. The head bolt torque specifications are 120 pounds per square inch. The head bolts should be torqued at 40 pound intervals.
It depends on what you consider large. A large bolt in a car would be a, crank bolt 7/8 x 3 inch- 10oz. control arm bolt/ head bolt 3/8 x 5 inch-5oz. U bolt for a solid axle - 8-10 oz. I would consider a 1 pound bolt as large. Some examples: 3/4 inch bolt 6 inches long is 1lb. 1/2 inch bolt 18inches long is 1 lb.
An SAE Grade 8 bolt will have 6 radial lines on it as shown below. \ | / / | \
I beleive you mean dead bolt, a 2-3/8" DEAD BOLT with a key on one side is good.
You have to tighten them three times, first start in the middle and do 25 ft/lbs, then do 50, then do 85 EXCEPT on the number 8 bolt only go to 75. Bolt tightening Sequence (FRONT) 9 8 5 6 1 2 3 4 7 10
Number 8 is usually for a central midfielder.