• Unification. Only the 9/16 size is not unified dimensionally with British and Canadian standards.
  • Tops and Bearing Surfaces of Nuts. Nuts may be double chamfered or have washer faced bearing surface and chamfered top.
    The of chamfer circle on double chamfered nuts and diameter of washer face shall be within the limits of the maximum width across flats and 95% of the minimum width across flats.
    The tops of washer faced nuts shall be flat and the diameter of chamfer circle shall be equal to the maximum width across flats within a tolerance of -15%. The length of chamfer at hex corners shall be 5% to 15% of the basic thread diameter. The surface of chamfer may be slightly convex or rounded.
    Bearing surfaces shall be flat and, unless otherwise specified, shall be perpendicular to the axis of the threaded hole within the total run out (FIM) tabulated for the respective nut size, type, and strength level.
  • Position of Hexagon to Tapped Hole. At maximum material condition, the axis of nut body shall be located at true position with respect to the axis of the tapped hole within a tolerance zone having a diameter equivalent to 4% of the maximum width across flats for 1-1/2" nominal size nuts or smaller.
  • Countersink. Tapped hole shall be countersunk on the bearing face or faces. The maximum countersink diameter shall be 1.08 times the thread basic (nominal) major diameter. No part of the threaded portion shall project beyond the bearing surface.
  • Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the width across corners is within specified limits at and beyond a distance equal to 17.5% of the basic thread diameter from the chamfered faces.
  • Width Across Flats. Maximum width across flats shall not be exceeded.
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Unit of Measure
Items
Heavy Hex Nuts for Use with Structural Bolts

Heavy Hex Nut for Use with Structural Bolts, with 7/8" Width Across Flat
Heavy Hex Nuts for Use with Structural Bolts

Heavy Hex Nut for Use with Structural Bolts, with 1-1/16" Width Across Flat
Heavy Hex Nuts for Use with Structural Bolts

Heavy Hex Nut for Use with Structural Bolts, with 1-1/4" Width Across Flat
Heavy Hex Nuts for Use with Structural Bolts

Heavy Hex Nut for Use with Structural Bolts, with 1-7/16" Width Across Flat
Heavy Hex Nuts for Use with Structural Bolts

Heavy Hex Nut for Use with Structural Bolts, with 1-5/8" Width Across Flat
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 Major Diameter of Thread 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 Major Diameter of Thread (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
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 1.382 in N/A 1.589 in N/A 1.796 in
Nominal Thickness (H) N/A 31/64 in N/A 39/64 in N/A 47/64 in N/A 55/64 in N/A 63/64 in
Max. Thickness (H) N/A 0.504 in N/A 0.631 in N/A 0.758 in N/A 0.885 in N/A 1.012 in
Min. Thickness (H) N/A 0.464 in N/A 0.587 in N/A 0.710 in N/A 0.833 in N/A 0.956 in
Max. Runout of Bearing Face, FIM (Specified Proof Load Up to 150,000 psi) N/A 0.023 in N/A 0.025 in N/A 0.027 in N/A 0.029 in N/A 0.031 in
Max. Runout of Bearing Face, FIM (Specified Proof Load 150,000 psi and Greater) N/A 0.016 in N/A 0.018 in N/A 0.020 in N/A 0.022 in N/A 0.024 in
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