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| Across Flats for Nuts and Bolts | ||
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Here you will find two lists of across flats sizes. The first is primarily historic as for the UK, metric sizes have superceded most of those in the first table. In the first table, All Dimensions are in Inches. In the second table (Metric), All Dimensions are in Millimetres. |
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| Abbreviations: - |
BA = British Association BSF = British Standard Fine BSW = British Standard Whitworth UNC = Unified Standard Coarse UNF = Unified Standard Fine A/F = Across Flats |
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| Size | A/F for BA, BSF & BSW | A/F for UNC/UNF |
| 10 - 24 and 10 - 32 | 0·3125 | |
| 2 BA | 0·345 | } BA sizes only appear |
| 0 BA | 0·413 | } in these 2 lines |
| 3/16 | 0·324 | |
| 1/4 | 0·455 | 0·4375 |
| 5/16 | 0·525 | 0·5000 |
| 3/8 | 0·600 | 0·5625 |
| 7/16 | 0·710 | 0·6875 |
| 1/2 | 0·820 | 0·7500 |
| 9/16 | 0·920 | 0·8750 |
| 5/8 | 1·010 | 0·9375 |
| 3/4 | 1·200 | 1·1250 |
| 7/8 | 1·300 | 1·3125 |
| 1·0 | 1·480 | 1·5000 |
| 11/8 | 1·670 | 1·6875 |
| 11/4 | 1·860 | 1·8750 |
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Metric Nuts and Bolts· Details apply to both Coarse and Fine threads |
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| Size | M5 | M6 | M8 | M10 | M12 | M16 | M20 | M22 | M24 | M30 |
| A/F | 8 | 10 | 13 | 17 | 19 | 24 | 30 | 32 | 36 | 46 |
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