ASTM A307 Grade Heavy Hex Bolt


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Heavy Hex Bolts: Head & Thread Dimensions - Type A307, Grades A & B (ASME B18.2.1-1996)
Nominal or Basic 
Product Diameter
Body Diameter (E) Width Across Flats (F)

 
Width Across Corners (G) Head Height (H)  Radius of Fillet (R) Thread
Length  (LT) 
Max Min Basic Max Min  Max  Min Basic  Max Min  Max Min    >6"
1/2 .5000 .515 .482 7/8 .875 .850 1.010 .969 11/32 .364 .302 .03 .01 1.250 1.500
5/8 .6250 .642 .605 1-1/16 1.062 1.031 1.227 1.175 27/64 .444 .378 .06 .02 1.500 1.750
3/4 .7500 .768 .729 1-1/4 1.250 1.212 1.443 1.383 1/2 .524 .455 .06 .02 1.750 2.000
7/8 .8750 .895 .852 1-7/16 1.438 1.394 1.660 1.589 37/64 .604 .531 .06 .02 2.000 2.250
1 1.0000 1.022 .976 1-5/8 1.625 1.575 1.876 1.796 43/64 .700 .591 .09 .03 2.250 2.500
1-1/8 1.1250 1.149 1.098 1-13/16 1.812 1.756 2.093 2.002 3/4 .780 .658 .09 .03 2.500 2.750
1-1/4 1.2500 1.277 1.223 2 2.000 1.938 2.309 2.209 27/32 .876 .749 .09 .03 2.750 3.000
1-3/8 1.3750 1.404 1.345 2-3/16 2.188 2.119 2.526 2.416 29/32 .940 .810 .09 .03 3.000 3.250
1-1/2 1.5000 1.531 1.470 2-3/8 2.375 2.300 2.742 2.622 1 1.036 .902 .09 .03 3.250 3.500
1-3/4 1.7500 1.785 1.716 2-3/4 2.750 2.662 3.175 3.035 1-5/32 1.196 1.054 .12 .04 3.750 4.000
2 2.0000 2.039 1.964 3-1/8 3.125 3.025 3.608 3.449 1-11/32 1.388 1.175 .12 .04 4.250 4.500
2-1/4 2.2500 2.305 2.214 3-1/2 3.500 3.388 4.041 3.862 1-1/2 1.548 1.327 .19 .06 4.750 5.000
2-1/2 2.5000 2.559 2.461 3-7/8 3.875 3.750 4.474 4.275 1-21/32 1.708 1.479 .19 .06 5.250 5.500
2-3/4 2.7500  2.827 2.711 4-1/4 4.250 4.112 4.907 4.688 1-13/16 1.869 1.632 .19 .06 5.750 6.000
3 3.0000  3.081 2.961 4-5/8 4.625 4.475 5.340 5.102 2 2.060 1.815 .19 .06 6.250 6.500

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