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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.
Unit of Measure

Manufacturer

Manufacturer

 N/A Industrial Fasteners Institute

Specifications

Product

 N/A Hex Flange Nuts

Unit of Measure

 N/A English

Nominal Size or Basic Major Dia. of Thread

 N/A 5/16 in

Nominal Size or Basic Major Dia. of Thread (Decimal)

 N/A 0.3125 in

Max. Width Across Flats (F)

 N/A 0.500 in

Min. Width Across Flats (F)

 N/A 0.489 in

Max. Width Across Corners (G)

 N/A 0.577 in

Min. Width Across Corners (G)

 N/A 0.557 in

Max. Flange Diameter (B)

 N/A 0.820 in

Min. Flange Diameter (B)

 N/A 0.790 in

Max. Nut Thickness (H)

 N/A 0.375 in

Min. Nut Thickness (H)

 N/A 0.343 in

Min. Wrenching Length (J)

 N/A 0.20 in

Min. Flange Thickness (K)

 N/A 0.04 in

Max. Angularity of Bearing Surface

 N/A 0.028 in

Codes and Standards

Codes and Standards

 N/A IFI-145 2002
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