• 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%.
  • Wrenching Height, J. Wrenching height is a distance measured from the bearing surface up the side of the head at the corners. The width across corners shall be within the specified limits for minimum wrenching height.
  • Bearing Surface. Bearing surface shall be flat and washer faced. Diameter of washer face shall be equal to the maximum width across flats within a tolerance of minus 10 percent.
    Thickness of the washer face shall be not less than 0.015 in. nor greater than 0.025 in. for screw sizes 3/4 in. and smaller, and not less than 0.015 in. nor greater than 0.035 in. for sizes larger than 3/4 in. Measurement of washer face diameter shall be taken at a height of 0.004 in. above the bearing surface.
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Unit of Measure
Items
Rolled Thread Heavy Hex Screws

Heavy Hex Screw, 1/2" Nominal Dia.
Rolled Thread Heavy Hex Screws

Heavy Hex Screw, 5/8" Nominal Dia.
Rolled Thread Heavy Hex Screws

Heavy Hex Screw, 3/4" Nominal Dia.
Rolled Thread Heavy Hex Screws

Heavy Hex Screw, 7/8" Nominal Dia.
Rolled Thread Heavy Hex Screws

Heavy Hex Screw, 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. Body Diameter (E) 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
Min. 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 1-1/16 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 5/16 in N/A 25/64 in N/A 15/32 in N/A 35/64 in N/A 39/64 in
Max. Head Height (H) N/A 0.323 in N/A 0.403 in N/A 0.483 in N/A 0.563 in N/A 0.627 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
Min. Wrenching Height (J) N/A 0.215 in N/A 0.269 in N/A 0.324 in N/A 0.378 in N/A 0.416 in
Nom. LT for Screw 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 Screw 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
Max. Transition Thread Length (Y) N/A 0.385 in N/A 0.455 in N/A 0.500 in N/A 0.556 in N/A 0.625 in
Max. Circular Runout of Bearing Surface FIM N/A 0.016 in N/A 0.019 in N/A 0.022 in N/A 0.025 in N/A 0.028 in
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