• Hex Thick Nuts
  • Tops and Bearing Surface of Nuts. Nuts in sizes 5/8 in. nominal size and smaller shall be double chamfered. Larger size nuts shall be double chamfered or have washer faced bearing surface and chamfered top.
    The diameter 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 percent 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 minus 15 percent. The length of chamfer at hex corners shall be from 5 to 15 percent of the basic thread diameter. The surface of chamfer may be slightly convex or rounded.
    Bearing surface shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective strength level.
  • Width Across Flats. Maximum width across flats shall not be exceeded. No transverse section through the nut between 25 and 75 percent of the actual nut thickness as measured from the bearing surface shall be less than the minimum width across flats. For milled-from-bar nuts, see statement in General Data pertaining to the nominal bar size to be used.
  • Corner Fill. A rounding or lack of fill at junction of hex corners with chamfer shall be permissible provided the minimum width across corners is within specified limits at and beyond a distance equal to 17.5 percent of the basic thread diameter from the chamfered faces.
  • True Position of Tapped Hole. The axis of tapped hole shall be located at true position with respect to the axis of nut body within a tolerance zone having a diameter equivalent to 4 percent of the maximum width across flats, regardless of feature size.
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Item #

Description

Nominal Size or Basic Major Dia. of Thread

Basic (F)

Max. (G)

Basic (H)

Max. Runout of Bearing Face, FIM (Specified Proof Load Up to 150,000 psi)

N/A Hex Thick Nut, 1/4" Nominal Dia. N/A 1/4 in N/A 7/16 in N/A 0.505 in N/A 9/32 in N/A 0.015 in
N/A Hex Thick Nut, 5/16" Nominal Dia. N/A 5/16 in N/A 1/2 in N/A 0.577 in N/A 21/64 in N/A 0.016 in
N/A Hex Thick Nut, 3/8" Nominal Dia. N/A 3/8 in N/A 9/16 in N/A 0.650 in N/A 13/32 in N/A 0.017 in
N/A Hex Thick Nut, 7/16" Nominal Dia. N/A 7/16 in N/A 11/16 in N/A 0.794 in N/A 29/64 in N/A 0.018 in
N/A Hex Thick Nut, 1/2" Nominal Dia. N/A 1/2 in N/A 3/4 in N/A 0.866 in N/A 9/16 in N/A 0.019 in
N/A Hex Thick Nut, 9/16" Nominal Dia. N/A 9/16 in N/A 7/8 in N/A 1.010 in N/A 39/64 in N/A 0.020 in
N/A Hex Thick Nut, 5/8" Nominal Dia. N/A 5/8 in N/A 15/16 in N/A 1.083 in N/A 23/32 in N/A 0.021 in
N/A Hex Thick Nut, 3/4" Nominal Dia. N/A 3/4 in N/A 1-1/8 in N/A 1.299 in N/A 13/16 in N/A 0.023 in
N/A Hex Thick Nut, 7/8" Nominal Dia. N/A 7/8 in N/A 1-5/16 in N/A 1.516 in N/A 29/32 in N/A 0.025 in
N/A Hex Thick Nut, 1" Nominal Dia. N/A 1 in N/A 1-1/2 in N/A 1.732 in N/A 1 in N/A 0.027 in
N/A Hex Thick Nut, 1-1/8" Nominal Dia. N/A 1-1/8 in N/A 1-11/16 in N/A 1.949 in N/A 1-5/32 in N/A 0.030 in
N/A Hex Thick Nut, 1-1/4" Nominal Dia. N/A 1-1/4 in N/A 1-7/8 in N/A 2.165 in N/A 1-1/4 in N/A 0.033 in
N/A Hex Thick Nut, 1-3/8" Nominal Dia. N/A 1-3/8 in N/A 2-1/16 in N/A 2.382 in N/A 1-3/8 in N/A 0.036 in
N/A Hex Thick Nut, 1-1/2" Nominal Dia. N/A 1-1/2 in N/A 2-1/4 in N/A 2.598 in N/A 1-1/2 in N/A 0.039 in
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