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As Jim asked what are you going to do with them. For example BA is ideal if you intend to do some model engineering and very small work. Metric which is a standard set for everyday use as it is now easy to get hold of nuts and bolts. Then there are the UNC, UNF, Whitworth, and BSP these are the most common but not used as much nowadays great for restoration jobs on older machines and engines. Along with those there are some very obscure ones out there.

[QUOTE="Dalboy, post: 136075, member: 449"] As Jim asked what are you going to do with them. For example BA is ideal if you intend to do some model engineering and very small work. Metric which is a standard set for everyday use as it is now easy to get hold of nuts and bolts. Then there are the UNC, UNF, Whitworth, and BSP these are the most common but not used as much nowadays great for restoration jobs on older machines and engines. Along with those there are some very obscure ones out there. [/QUOTE]

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