• Unification. Bold type indicates products unified dimensionally with British and Canadian standards. Unification of fine thread nuts is limited to sizes 1 in. and under.
  • 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 top 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 specified FIM limit.
  • 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.
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Unit of Measure
Items
Hex Slotted Nuts

Hex Slotted Nut, 1/4" Nominal Dia.
Hex Slotted Nuts

Hex Slotted Nut, 5/16" Nominal Dia.
Hex Slotted Nuts

Hex Slotted Nut, 3/8" Nominal Dia.
Hex Slotted Nuts

Hex Slotted Nut, 7/16" Nominal Dia.
Hex Slotted Nuts

Hex Slotted Nut, 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 1/4 in N/A 5/16 in N/A 3/8 in N/A 7/16 in N/A 1/2 in
Nominal Size or Basic Major Dia. of Thread (Decimal) N/A 0.2500 in N/A 0.3125 in N/A 0.3750 in N/A 0.4375 in N/A 0.5000 in
Basic Width Across Flats (F) N/A 7/16 in N/A 1/2 in N/A 9/16 in N/A 11/16 in N/A 3/4 in
Max. Width Across Flats (F) N/A 0.438 in N/A 0.500 in N/A 0.562 in N/A 0.688 in N/A 0.750 in
Min. Width Across Flats (F) N/A 0.428 in N/A 0.489 in N/A 0.551 in N/A 0.675 in N/A 0.736 in
Max. Width Across Corners (G) N/A 0.505 in N/A 0.577 in N/A 0.650 in N/A 0.794 in N/A 0.866 in
Min. Width Across Corners (G) N/A 0.488 in N/A 0.557 in N/A 0.628 in N/A 0.768 in N/A 0.840 in
Basic Thickness (H) N/A 7/32 in N/A 17/64 in N/A 21/64 in N/A 3/8 in N/A 7/16 in
Max. Thickness (H) N/A 0.226 in N/A 0.273 in N/A 0.337 in N/A 0.385 in N/A 0.448 in
Min. Thickness (H) N/A 0.212 in N/A 0.258 in N/A 0.320 in N/A 0.365 in N/A 0.427 in
Max. Unslotted Thickness (T) N/A 0.14 in N/A 0.18 in N/A 0.210 in N/A 0.23 in N/A 0.29 in
Min. Unslotted Thickness (T) N/A 0.120 in N/A 0.16 in N/A 0.19 in N/A 0.210 in N/A 0.27 in
Max. Width of Slot (S) N/A 0.100 in N/A 0.12 in N/A 0.15 in N/A 0.15 in N/A 0.18 in
Min. Width of Slot (S) N/A 0.07 in N/A 0.09 in N/A 0.12 in N/A 0.12 in N/A 0.150 in
Max. Runout of Bearing Surface FIM N/A 0.015 in N/A 0.016 in N/A 0.018 in N/A 0.018 in N/A 0.019 in
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