Across Flats Dimensions of Hex Headed Bolts
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Shaft Diameter | Maximum | Minimum | ||
Inches | mm | Inches | mm | |
10BA | 0.117 | 2.97 | 0.114 | 2.90 |
SAE NO 2 | 0.125 | 3.18 | 0.120 | 3.05 |
9BA | 0.131 | 3.33 | 0.128 | 3.25 |
8BA | 0.152 | 3.86 | 0.149 | 3.79 |
7BA | 0.172 | 4.37 | 0.169 | 4.29 |
SAE NO 3 | 0.187 | 4.75 | 0.181 | 4.59 |
SAE NO 4 | 0.187 | 4.75 | 0.181 | 4.59 |
SAE NO 5 | 0.187 | 4.75 | 0.181 | 4.59 |
6BA | 0.193 | 4.90 | 0.189 | 4.80 |
5BA | 0.220 | 5.59 | 0.216 | 5.49 |
BS 1/8" | 0.220 | 5.59 | 0.216 | 5.49 |
4BA | 0.248 | 6.30 | 0.243 | 6.17 |
BS 5/32" | 0.245 | 6.30 | 0.243 | 6.17 |
SAE NO 6 | 0.250 | 6.35 | 0.244 | 6.20 |
SAE NO 8 | 0.250 | 6.35 | 0.244 | 6.20 |
3BA | 0.282 | 7.16 | 0.277 | 7.04 |
SAE NO 10 | 0.312 | 7.92 | 0.305 | 7.75 |
SAE NO 12 | 0.312 | 7.92 | 0.305 | 7.75 |
5mm | 0.315 | 8.00 | 0.300 | 7.64 |
2BA | 0.324 | 8.23 | 0.319 | 8.10 |
BS 3/16" | 0.324 | 8.23 | 0.319 | 8.10 |
1BA | 0.365 | 9.27 | 0.360 | 9.14 |
6mm | 0.394 | 10.00 | 0.379 | 9.64 |
0BA | 0.413 | 10.49 | 0.408 | 10.36 |
SAE 1/4" | 0.438 | 11.13 | 0.425 | 10.80 |
BS 1/4" | 0.445 | 11.30 | 0.435 | 11.05 |
SAE 5/16" | 0.500 | 12.70 | 0.484 | 12.29 |
8mm | 0.512 | 13.00 | 0.495 | 12.57 |
BS 5/16" | 0.525 | 13.34 | 0.515 | 13.08 |
SAE 3/8" | 0.563 | 14.30 | 0.544 | 13.82 |
BS 3/8" | 0.600 | 15.24 | 0.585 | 14.86 |
SAE 7/16" | 0.625 | 15.87 | 0.603 | 15.32 |
10mm | 0.669 | 17.00 | 0.652 | 16.57 |
BS 7/16" | 0.710 | 18.03 | 0.695 | 17.65 |
12mm | 0.748 | 19.00 | 0.727 | 18.48 |
SAE 1/2" | 0.750 | 19.05 | 0.725 | 18.42 |
SAE 9/16" | 0.812 | 20.62 | 0.798 | 20.27 |
BS 1/2" | 0.820 | 20.82 | 0.800 | 20.32 |
BS 9/16" | 0.920 | 23.37 | 0.900 | 22.86 |
SAE 5/8" | 0.938 | 23.81 | 0.906 | 23.01 |
16mm | 0.945 | 24.00 | 0.912 | 23.16 |
BS 5/8" | 1.010 | 25.65 | 0.985 | 25.02 |
SAE 3/4" | 1.125 | 28.58 | 1.088 | 27.64 |
20mm | 1.181 | 30.00 | 1.148 | 29.16 |
BS 3/4" | 1.200 | 30.48 | 1.175 | 29.85 |
BS 7/8" | 1.300 | 33.02 | 1.270 | 32.26 |
SAE 7/8" | 1.313 | 33.34 | 1.269 | 32.23 |
24mm | 1.417 | 36.00 | 1.378 | 35.00 |
BS 1" | 1.480 | 37.59 | 1.450 | 36.83 |
SAE 1" | 1.500 | 38.10 | 1.450 | 36.83 |