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Large Hex Flange Nuts

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  • Tops of Nuts. Tops of nuts shall be flat and chamfered, the length of chamfer at hex corners shall be from 5 to 15 percent of the basic thread size. The surface may be slightly convex or rounded.
  • Bearing Surface. Bearing surface shall be at right angle to axis of the threaded hole within a tolerance of 2 degrees; therefore, the maximum total angularity of bearing surface would equal the tangent of specified angle times the diameter of the flange.
  • Concentricity of Tapped Hole. Axis of tapped hole shall be concentric with axis of nut body within a tolerance equal to 3 percent (6 percent FIM) of the maximum width across flats.
  • Countersink. Tapped hole shall be countersunk on the bearing face and may be countersunk on the top. The maximum countersunk 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 or fine thread series (UNC or UNF series), Class 2B, in accordance with ASME B1.1.
  • Material. Unless otherwise specified, chemical and mechanical properties of steel nuts shall conform with ASTM A563, Grade A, or SAE J995, Grade 2. Nuts of other materials such as corrosion resistant (stainless) steel, brass, bronze and aluminum alloys shall have properties as agreed 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

Max. (F)

Max. (G)

Max. (B)

Max. (H)

Min. (J)

item-3680 Large Hex Flange Nut, 0.2500" Nominal Dia. 1/4 in 0.438 in 0.505 in 0.728 in 0.312 in 0.15 in
item-3681 Large Hex Flange Nut, 0.3125" Nominal Dia. 5/16 in 0.500 in 0.577 in 0.820 in 0.375 in 0.20 in
item-3682 Large Hex Flange Nut, 0.3750" Nominal Dia. 3/8 in 0.562 in 0.650 in 0.915 in 0.406 in 0.240 in
item-3683 Large Hex Flange Nut, 0.4375" Nominal Dia. 7/16 in 0.688 in 0.794 in 1.131 in 0.468 in 0.26 in
item-3684 Large Hex Flange Nut, 0.5000" Nominal Dia. 1/2 in 0.750 in 0.866 in 1.205 in 0.515 in 0.29 in
item-3685 Large Hex Flange Nut, 0.5825" Nominal Dia. 9/16 in 0.875 in 1.010 in 1.300 in 0.578 in 0.37 in
item-3686 Large Hex Flange Nut, 0.6250" Nominal Dia. 5/8 in 0.938 in 1.083 in 1.360 in 0.640 in 0.42 in
  Results 1 - 7 of 7 1 
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