Hex Bolts (ANSI/ASME B 18.2.1-2012): This part of the chart provides technical drawings and a table with dimensional data for hex bolts
Ananka Group is a leading Hex Bolts Manufacturer in India. We, Ananka Group offer Hex Bolts in different sizes & standards. Hex Bolts are also available in different materials and grades. Hex bolts are commonly used for construction projects such as docks, bridges, highway systems, and homes, among other things. Headed anchor bolts are usually made of hex bolts with forged heads
Hex Bolts – Dimensional Chart (ANSI/ASME B 18.2.1-2012)
This chart presents the key dimensional data for hex bolts as specified by the ANSI/ASME B 18.2.1-2012 standard. Adhering to these specifications ensures consistent interchangeability and reliable performance across various applications.
All dimensions are in inches.
| Nominal Diameter | d (Body Diameter) | s (Width Across Flats) | k (Head Height) | L (Thread Length) | ||||
|---|---|---|---|---|---|---|---|---|
| max | min | max | min | max | min | L ≤ 6 | L > 6 | |
| 1/4 | 0.260 | 0.237 | 0.438 | 0.425 | 0.188 | 0.150 | 0.750 | 1.000 |
| 5/16 | 0.324 | 0.298 | 0.500 | 0.484 | 0.235 | 0.195 | 0.875 | 1.125 |
| 3/8 | 0.388 | 0.360 | 0.562 | 0.544 | 0.268 | 0.226 | 1.000 | 1.250 |
| 7/16 | 0.452 | 0.421 | 0.625 | 0.603 | 0.316 | 0.272 | 1.125 | 1.375 |
| 1/2 | 0.515 | 0.482 | 0.750 | 0.725 | 0.364 | 0.302 | 1.250 | 1.500 |
| 5/8 | 0.642 | 0.605 | 0.938 | 0.905 | 0.444 | 0.378 | 1.500 | 1.750 |
| 3/4 | 0.768 | 0.729 | 1.125 | 1.088 | 0.524 | 0.455 | 1.750 | 2.000 |
| 7/8 | 0.895 | 0.852 | 1.312 | 1.269 | 0.604 | 0.531 | 2.000 | 2.250 |
| 1 | 1.022 | 0.976 | 1.500 | 1.450 | 0.700 | 0.591 | 2.250 | 2.500 |
| 1-1/8 | 1.149 | 1.098 | 1.688 | 1.631 | 0.780 | 0.658 | 2.500 | 2.750 |
| 1-1/4 | 1.277 | 1.223 | 1.875 | 1.812 | 0.876 | 0.749 | 2.750 | 3.000 |
| 1-3/8 | 1.404 | 1.345 | 2.062 | 1.994 | 0.940 | 0.810 | 3.000 | 3.250 |
| 1-1/2 | 1.531 | 1.470 | 2.250 | 2.175 | 1.036 | 0.902 | 3.250 | 3.500 |
| 1-5/8 | 1.658 | 1.591 | 2.438 | 2.356 | 1.116 | 0.978 | 3.500 | 3.750 |
| 1-3/4 | 1.785 | 1.716 | 2.625 | 2.538 | 1.196 | 1.054 | 3.750 | 4.000 |
| 1-7/8 | 1.912 | 1.839 | 2.812 | 2.719 | 1.276 | 1.130 | 4.000 | 4.250 |
| 2 | 2.039 | 1.964 | 3.000 | 2.900 | 1.388 | 1.175 | 4.250 | 4.500 |
| 2-1/4 | 2.305 | 2.214 | 3.375 | 3.262 | 1.548 | 1.327 | 4.750 | 5.000 |
| 2-1/2 | 2.559 | 2.461 | 3.750 | 3.625 | 1.708 | 1.479 | 5.250 | 5.500 |
| 2-3/4 | 2.827 | 2.711 | 4.125 | 3.988 | 1.869 | 1.632 | 5.750 | 6.000 |
| 3 | 3.081 | 2.961 | 4.500 | 4.350 | 2.060 | 1.815 | 6.250 | 6.500 |
| 3-1/4 | 3.335 | 3.210 | 4.875 | 4.712 | 2.251 | 1.936 | 6.750 | 7.000 |
| 3-1/2 | 3.589 | 3.461 | 5.250 | 5.075 | 2.380 | 2.057 | 7.250 | 7.500 |
| 3-3/4 | 3.858 | 3.726 | 5.625 | 5.437 | 2.572 | 2.241 | 7.750 | 8.000 |
| 4 | 4.111 | 3.975 | 6.000 | 5.800 | 2.764 | 2.424 | 8.250 | 8.500 |
**Note: This table provides general dimensional guidelines based on the ANSI/ASME B 18.2.1-2012 standard. Always refer to the official standard document for complete and definitive specifications, including tolerances and specific applications.
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