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Hex Nuts

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  • Unification. Bold type indicates products unified dimensionally with British and Canadian standards. Unification of fine thread nuts is limited to sizes 1 in. and smaller.
  • Tops and Bearing Surfaces 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 surfaces shall be flat and perpendicular to the axis of the threaded hole within the FIM limits specified for the respective nut type and 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 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.
  • Countersink. Tapped hole shall be countersunk on the bearing face or faces. The maximum countersink diameter shall be the thread basic (nominal) major diameter plus 0.030 in. for 3/8 in. nominal size nuts and smaller, and 1.08 times the basic major diameter for nuts larger than 3/8 in. No part of the threaded portion shall project beyond the bearing surface.
  • Threads. Threads shall be Unified coarse, fine, or 8 thread series (UNC, UNF, or 8 UN Series), Class 2B, in accordance with ASME B1.1.
  • Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with Grade A of ASTM A563 or Grade 2 of SAE J995. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze and aluminum alloys shall have properties as agreed upon between the manufacturer and purchaser. The properties for nuts of several grades of corrosion resistant steel alloys are covered in ASTM F594 and of several nonferrous materials in ASTM F467.
  • Nominal Size. Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place shall be omitted.

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Item #


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)

HN02500XXX Hex Nut, 1/4" Nominal Dia. 1/4 in 7/16 in 0.505 in 7/32 in 0.015 in
HN03125XXX Hex Nut, 5/16" Nominal Dia. 5/16 in 1/2 in 0.577 in 17/64 in 0.016 in
HN03750XXX Hex Nut, 3/8" Nominal Dia. 3/8 in 9/16 in 0.650 in 21/64 in 0.017 in
HN04375XXX Hex Nut, 7/16" Nominal Dia. 7/16 in 11/16 in 0.794 in 3/8 in 0.018 in
HN05000XXX Hex Nut, 1/2" Nominal Dia. 1/2 in 3/4 in 0.866 in 7/16 in 0.019 in
HN05625XXX Hex Nut, 9/16" Nominal Dia. 9/16 in 7/8 in 1.010 in 31/64 in 0.020 in
HN06250XXX Hex Nut, 5/8" Nominal Dia. 5/8 in 15/16 in 1.083 in 35/64 in 0.021 in
HN07500XXX Hex Nut, 3/4" Nominal Dia. 3/4 in 1-1/8 in 1.299 in 41/64 in 0.023 in
HN08750XXX Hex Nut, 7/8" Nominal Dia. 7/8 in 1-5/16 in 1.516 in 3/4 in 0.025 in
HN10000XXX Hex Nut, 1" Nominal Dia. 1 in 1-1/2 in 1.732 in 55/64 in 0.027 in
HN11250XXX Hex Nut, 1-1/8" Nominal Dia. 1-1/8 in 1-11/16 in 1.949 in 31/32 in 0.030 in
HN12500XXX Hex Nut, 1-1/4" Nominal Dia. 1-1/4 in 1-7/8 in 2.165 in 1-1/16 in 0.033 in
HN13750XXX Hex Nut, 1-3/8" Nominal Dia. 1-3/8 in 2-1/16 in 2.382 in 1-11/64 in 0.036 in
HN15000XXX Hex Nut, 1-1/2" Nominal Dia. 1-1/2 in 2-1/4 in 2.598 in 1-9/32 in 0.039 in
  Results 1 - 14 of 14 1 
Distributor of Industry Standard and Military Specification Threaded Fasteners