Spanner Size calculation formula for bolts

Spanner Bolt Size calculation formula
Bolt size known then spanner size calculation
spanner size identification
spanner design
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[@RethinamalaMuthuraman]

Very imformative

[@raphazard8737]

We could just use an adjustable spanner right?

[@anjanikumargaur2589]

What stand for 1.5

[@Gaurav_7875]

Good explanation

[@jaynath4072]

Hi sir
Could you help me to clear size of spanner for few bolt size
2-1/2"
2-3/4"
3-1/2"
3-1/4"
3"
As too many confusion regarding the spanner
M64
M72
M90
M80
M76
M100
4"