• Top of Head. Top of head shall be full form and chamfered or rounded with the diameter of chamfer circle or start of rounding being equal to the maximum width across flats within a tolerance of minus 15%.
  • Head Taper. Maximum width across flats shall not be exceeded. No transverse section through the head between 25% and 75% of actual head height, as measured from the bearing surface, shall be less than the minimum width across flats.
  • 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%. Thickness of the washer face shall be not less than 0.015 in. nor greater than 0.025 in. for bolt 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.
    The plane of the bearing surface shall be perpendicular to the axis of the body within the FIM limits specified for total runout. Measurement of FIM shall extend as close to the periphery of the bearing surface as possible while the bolt is being held in a collet or other gripping device at a distance of one bolt diameter from the underside of the head.
  • 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% of the maximum width across flats at maximum material condition.
  • Body Diameter. Any swell or fin under the head or any die seam on the body shall not exceed the basic bolt diameter.
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Unit of Measure
Items
Heavy Hex Structural Bolts

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

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

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

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

Heavy Hex Structural Bolt, 1" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Structural Bolting
Codes and Standards N/A ASME Draft Revision B18.2.6 2003
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 0.515 in N/A 0.642 in N/A 0.768 in N/A 0.895 in N/A 1.022 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
Nominal 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
Nominal 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
Max. Radius of Fillet (R) N/A 0.031 in N/A 0.062 in N/A 0.062 in N/A 0.062 in N/A 0.093 in
Min. Radius of Fillet (R) N/A 0.009 in N/A 0.021 in N/A 0.021 in N/A 0.031 in N/A 0.062 in
Ref. Thread Length (LT) N/A 1.00 in N/A 1.25 in N/A 1.38 in N/A 1.50 in N/A 1.75 in
Ref. Transition Thread Length (Y) N/A 0.19 in N/A 0.22 in N/A 0.25 in N/A 0.28 in N/A 0.31 in
Max. Total 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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