• 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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Unit of Measure
Items
Hex & Large Hex Flange Nuts

Hex Flange Nut, 0.1380" Nominal Dia.
Hex & Large Hex Flange Nuts

Hex Flange Nut, 0.1640" Nominal Dia.
Hex & Large Hex Flange Nuts

Hex Flange Nut, 0.1900" Nominal Dia.
Hex & Large Hex Flange Nuts

Hex Flange Nut, 0.2160" Nominal Dia.
Hex & Large Hex Flange Nuts

Hex Flange Nut, 0.2500" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Hex Flange Nuts
Codes and Standards N/A IFI-145 2002
Unit of Measure N/A English
Nominal Size or Basic Major Dia. of Thread N/A No. 6 N/A No. 8 N/A No. 10 N/A No. 12 N/A 1/4 in
Nominal Size or Basic Major Dia. of Thread (Decimal) N/A 0.1380 in N/A 0.1640 in N/A 0.1900 in N/A 0.2160 in N/A 0.2500 in
Max. Width Across Flats (F) N/A 0.312 in N/A 0.344 in N/A 0.375 in N/A 0.438 in N/A 0.438 in
Min. Width Across Flats (F) N/A 0.302 in N/A 0.334 in N/A 0.365 in N/A 0.428 in N/A 0.428 in
Max. Width Across Corners (G) N/A 0.361 in N/A 0.397 in N/A 0.433 in N/A 0.505 in N/A 0.505 in
Min. Width Across Corners (G) N/A 0.342 in N/A 0.381 in N/A 0.416 in N/A 0.488 in N/A 0.488 in
Max. Flange Diameter (B) N/A 0.422 in N/A 0.469 in N/A 0.500 in N/A 0.594 in N/A 0.594 in
Min. Flange Diameter (B) N/A 0.406 in N/A 0.452 in N/A 0.480 in N/A 0.574 in N/A 0.574 in
Max. Nut Thickness (H) N/A 0.171 in N/A 0.203 in N/A 0.219 in N/A 0.236 in N/A 0.236 in
Min. Nut Thickness (H) N/A 0.156 in N/A 0.187 in N/A 0.203 in N/A 0.222 in N/A 0.222 in
Min. Wrenching Length (J) N/A 0.10 in N/A 0.13 in N/A 0.13 in N/A 0.140 in N/A 0.140 in
Min. Flange Thickness (K) N/A 0.02 in N/A 0.02 in N/A 0.03 in N/A 0.04 in N/A 0.04 in
Max. Angularity of Bearing Surface N/A 0.014 in N/A 0.016 in N/A 0.017 in N/A 0.020 in N/A 0.020 in
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