• Surface Condition. Bolts need not be finished on any surface except threads.
  • Top of Head. Top of head shall be full form and chamfered with the diameter of chamfer circle being equal to the maximum width across flats, within a tolerance of minus 15 percent.
  • Head Taper. Maximum width across flats and across corners shall not be exceeded. No transverse section through the head between 25 percent and 75 percent of actual head height, as measured from the bearing surface, shall be less than the minimum width across flats and across corners.
  • Bearing Surface. A die seam across the bearing surface is permissible. Bearing surface shall be perpendicular to the axis of the body within a tolerance of 3 deg for 1 in. size and smaller, and 2 deg for sizes larger than 1 in. Angularity measurement shall be taken at a location to avoid interference from a die seam.
  • True Position of Head. The axis of the head shall be located at true position with respect to the axis of the body (determined over a distance under the head equal to one diameter) within a tolerance zone having a diameter equivalent to 6 percent of the maximum width across flats, regardless of feature size.
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Unit of Measure
Items
Rolled Thread Heavy Hex Bolts

Heavy Hex Bolt, 1/2" Nominal Dia.
Rolled Thread Heavy Hex Bolts

Heavy Hex Bolt, 5/8" Nominal Dia.
Rolled Thread Heavy Hex Bolts

Heavy Hex Bolt, 3/4" Nominal Dia.
Rolled Thread Heavy Hex Bolts

Heavy Hex Bolt, 7/8" Nominal Dia.
Rolled Thread Heavy Hex Bolts

Heavy Hex Bolt, 1" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Square and Hex Bolts and Screws
Codes and Standards N/A ASME B18.2.1 1996
Unit of Measure N/A English
Nominal Size or Basic Product Diameter N/A 1/2 in N/A 5/8 in N/A 3/4 in N/A 7/8 in N/A 1 in
Nominal Size or Basic Product Diameter (Decimal) N/A 0.5000 in N/A 0.6250 in N/A 0.7500 in N/A 0.8750 in N/A 1.0000 in
Max. Full-Size Body Diameter (E) N/A 0.515 in N/A 0.642 in N/A 0.768 in N/A 0.895 in N/A 1.022 in
Min. Full-Size Body Diameter (E) N/A 0.482 in N/A 0.605 in N/A 0.729 in N/A 0.852 in N/A 0.976 in
Basic Width Across Flats (F) N/A 7/8 in N/A 11/16 in N/A 1-1/4 in N/A 1-7/16 in N/A 1-5/8 in
Max. Width Across Flats (F) N/A 0.875 in N/A 1.062 in N/A 1.250 in N/A 1.438 in N/A 1.625 in
Min. Width Across Flats (F) N/A 0.850 in N/A 1.031 in N/A 1.212 in N/A 1.394 in N/A 1.575 in
Max. Width Across Corners (G) N/A 1.010 in N/A 1.227 in N/A 1.443 in N/A 1.660 in N/A 1.876 in
Min. Width Across Corners (G) N/A 0.969 in N/A 1.175 in N/A 1.383 in N/A 1.589 in N/A 1.796 in
Basic Head Height (H) N/A 11/32 in N/A 27/64 in N/A 1/2 in N/A 37/64 in N/A 43/64 in
Max. Head Height (H) N/A 0.364 in N/A 0.444 in N/A 0.524 in N/A 0.604 in N/A 0.700 in
Min. Head Height (H) N/A 0.302 in N/A 0.378 in N/A 0.455 in N/A 0.531 in N/A 0.591 in
Max. Radius of Fillet (R) N/A 0.03 in N/A 0.06 in N/A 0.06 in N/A 0.06 in N/A 0.09 in
Min. Radius of Fillet (R) N/A 0.010 in N/A 0.020 in N/A 0.020 in N/A 0.020 in N/A 0.030 in
Nom. LT for Bolt Length (6 in. and Shorter) N/A 1.250 in N/A 1.500 in N/A 1.750 in N/A 2.000 in N/A 2.250 in
Nom. LT for Bolt Length (Over 6 in.) N/A 1.500 in N/A 1.750 in N/A 2.000 in N/A 2.250 in N/A 2.500 in
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