AF is a means of measuring the size of the hexagonal heads of imperial sized bolts and nuts for the purpose of indicating the size spanner to use. It has been around for more than 55 years. It means “Across the Flats”.
AF is a means of measuring the size of the hexagonal heads of imperial sized bolts and nuts for the purpose of indicating the size spanner to use. It has been around for more than 55 years. It means “Across the Flats”.
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