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Heavy Square Nuts

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  • Tops of Nuts. Tops of nuts shall be flat and chamfered or washer crowned. Diameter of the chamfer circle shall be equal to the maximum width across flats within a tolerance of minus 15 percent. 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.
  • Bearing Surface. Bearing surface shall be perpendicular to the axis of the threaded hole within a tolerance of 3 deg for 1 in. nominal size nuts and smaller, and 2 deg for nuts larger than 1 in.
  • 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 10 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. 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)

HSQN02500XXX Heavy Square Nut, 1/4" Nominal Dia. 1/4 in 1/2 in 0.707 in 1/4 in
HSQN03125XXX Heavy Square Nut, 5/16" Nominal Dia. 5/16 in 9/16 in 0.795 in 5/16 in
HSQN03750XXX Heavy Square Nut, 3/8" Nominal Dia. 3/8 in 11/16 in 0.973 in 3/8 in
HSQN04375XXX Heavy Square Nut, 7/16" Nominal Dia. 7/16 in 3/4 in 1.060 in 7/16 in
HSQN05000XXX Heavy Square Nut, 1/2" Nominal Dia. 1/2 in 7/8 in 1.237 in 1/2 in
HSQN06250XXX Heavy Square Nut, 5/8" Nominal Dia. 5/8 in 1-1/16 in 1.503 in 5/8 in
HSQN07500XXX Heavy Square Nut, 3/4" Nominal Dia. 3/4 in 1-1/4 in 1.768 in 3/4 in
HSQN08750XXX Heavy Square Nut, 7/8" Nominal Dia. 7/8 in 1-7/16 in 2.033 in 7/8 in
HSQN10000XXX Heavy Square Nut, 1" Nominal Dia. 1 in 1-5/8 in 2.298 in 1 in
HSQN11250XXX Heavy Square Nut, 1-1/8" Nominal Dia. 1-1/8 in 1-13/16 in 2.563 in 1-1/8 in
HSQN12500XXX Heavy Square Nut, 1-1/4" Nominal Dia. 1-1/4 in 2 in 2.828 in 1-1/4 in
HSQN13750XXX Heavy Square Nut, 1-3/8" Nominal Dia. 1-3/8 in 2-3/16 in 3.094 in 1-3/8 in
HSQN15000XXX Heavy Square Nut, 1-1/2" Nominal Dia. 1-1/2 in 2-3/8 in 3.359 in 1-1/2 in
  Results 1 - 13 of 13 1 
Distributor of Industry Standard and Military Specification Threaded Fasteners