How is bolt patterns measured?
An explanation of how bolt measurements compare is given on the baconsdozen.co.uk web site.
There are various different standards including many that are now considered obsolete,they include British Standard Whitorth,British Association,Metric coarse and metric fine,Unified Fine,Cycle thread etc etc.All use different spanner and socket sizes,the older imperial ones are still available from specialists like Baconsdozen.com.
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