Across Flats on Nuts and Bolts
Across Flats for Nuts and Bolts
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 The first is primarily historic as for the UK, metric sizes have superceded most of those in the first table.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.
 
Abbreviations: - BA = British Association
BSF = British Standard Fine
BSW = British Standard Whitworth
UNC = Unified Standard Coarse
UNF = Unified Standard Fine
A/F = Across Flats
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

Metric Nuts and Bolts·
Details apply to both Coarse and Fine threads
 
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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