ASME B18.2.1-1996 Lag Screws
Basic Product Diameter         No. 10 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 0.19 0.25 0.3125 0.375 0.4375 0.5 0.625 0.75 0.875 Threads Per Inch   11 10 9 7 7 6 5 4-1/2 4 Shoulder Diameter S Max 0.199 0.26 0.324 0.388 0.452 0.515 0.642 0.768 0.895 Min 0.178 0.237 0.298 0.36 0.421 0.482 0.605 0.729 0.852     Width Across Flats F Basic 9/32 7/16 1/2 9/16 5/8 3/4 15/16 1-1/8 1-5/16 Max 0.281 0.438 0.5 0.562 0.625 0.75 0.938 1.125 1.312 Min 0.271 0.425 0.484 0.544 0.603 0.725 0.906 1.088 1.269 Width Across Corners G Max 0.323 0.505 0.577 0.65 0.722 0.866 1.083 1.299 1.516 Min 0.309 0.484 0.552 0.62 0.687 0.826 1.033 1.24 1.447 Head Height H Basic 1/8 11/64 7/32 1/4 19/64 11/32 27/64 1/2 37/64 Max 0.14 0.188 0.235 0.268 0.316 0.364 0.444 0.524 0.604 Min 0.11 0.15 0.195 0.226 0.272 0.302 0.378 0.455 0.531 Shoulder Length S Min 0.094 0.094 0.125 0.125 0.156 0.156 0.312 0.375 0.375