• Unification. Bold type indicates products unified dimensionally with British and Canadian standards.
  • Smaller Sizes. For sizes 1/4 in. through 1 in, the nuts specified in the Table are recommended.
  • Tops of Nuts. Tops of nuts shall be flat and chamfered. Diameter of the 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.
  • 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 face.
  • Bearing Surface. Bearing surface shall be flat and perpendicular to the axis of the threaded hole within a tolerance of 2 deg.
  • 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.
  • Threads. Threads shall be Unified coarse thread series (UNC 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 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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Unit of Measure
Items
Hex Flat/Jam Nuts

Hex Flat Nut, 1-1/8" Nominal Dia.
Hex Flat/Jam Nuts

Hex Flat Nut, 1-1/4" Nominal Dia.
Hex Flat/Jam Nuts

Hex Flat Nut, 1-3/8" Nominal Dia.
Hex Flat/Jam Nuts

Hex Flat Nut, 1-1/2" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Nuts
Codes and Standards N/A ASME/ANSI B18.2.2 1987 (R 1999)
Unit of Measure N/A English
Nominal Size or Basic Major Dia. of Thread N/A 1-1/8 in N/A 1-1/4 in N/A 1-3/8 in N/A 1-1/2 in
Nominal Size or Basic Major Dia. of Thread (Decimal) N/A 1.1250 in N/A 1.2500 in N/A 1.3750 in N/A 1.5000 in
Basic Width Across Flats (F) N/A 1-11/16 in N/A 1-7/8 in N/A 2-1/16 in N/A 2-1/4 in
Max. Width Across Flats (F) N/A 1.688 in N/A 1.875 in N/A 2.062 in N/A 2.250 in
Min. Width Across Flats (F) N/A 1.631 in N/A 1.812 in N/A 1.994 in N/A 2.175 in
Max. Width Across Corners (G) N/A 1.949 in N/A 2.165 in N/A 2.382 in N/A 2.598 in
Min. Width Across Corners (G) N/A 1.859 in N/A 2.066 in N/A 2.273 in N/A 2.480 in
Basic Thickness (H) N/A 1 in N/A 1-3/32 in N/A 1-13/64 in N/A 1-5/16 in
Max. Thickness (H) N/A 1.030 in N/A 1.126 in N/A 1.237 in N/A 1.348 in
Min. Thickness (H) N/A 0.970 in N/A 1.062 in N/A 1.169 in N/A 1.276 in
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