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Unit of Measure
Items
Heavy Hex Nuts1

Heavy Hex Jam Nut, 1/4" Nominal Dia.
Heavy Hex Nuts1

Heavy Hex Jam Nut, 5/16" Nominal Dia.
Heavy Hex Nuts1

Heavy Hex Jam Nut, 3/8" Nominal Dia.
Heavy Hex Nuts1

Heavy Hex Jam Nut, 7/16" Nominal Dia.
Heavy Hex Nuts1

Heavy Hex Jam 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 1/2 in N/A 9/16 in N/A 11/16 in N/A 3/4 in N/A 7/8 in
Max. Width Across Flats (F) N/A 0.500 in N/A 0.562 in N/A 0.688 in N/A 0.750 in N/A 0.875 in
Min. Width Across Flats (F) N/A 0.488 in N/A 0.546 in N/A 0.669 in N/A 0.728 in N/A 0.850 in
Max. Width Across Corners (G) N/A 0.577 in N/A 0.650 in N/A 0.794 in N/A 0.866 in N/A 1.010 in
Min. Width Across Corners (G) N/A 0.556 in N/A 0.622 in N/A 0.763 in N/A 0.830 in N/A 0.969 in
Basic Thickness (H1) N/A 11/64 in N/A 13/64 in N/A 15/64 in N/A 17/64 in N/A 19/64 in
Max. Thickness (H1) N/A 0.188 in N/A 0.220 in N/A 0.252 in N/A 0.285 in N/A 0.317 in
Min. Thickness (H1) N/A 0.156 in N/A 0.186 in N/A 0.216 in N/A 0.247 in N/A 0.277 in
Max. Runout of Bearing Face, FIM (All Strength Levels) N/A 0.017 in N/A 0.020 in N/A 0.021 in N/A 0.022 in N/A 0.023 in
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