• Top of Head. Top of head shall be full form and chamfered, with the diameter of chamfer circle being equal to the maximum width across flats within a tolerance of minus 15 percent.
  • Wrenching Height, J. Wrenching height is a distance measured from the bearing surface up the side of the head at the corners. The width across corners shall be within specified limits for the full wrenching height.
  • Bearing Surface. Bearing surface shall be flat and washer
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Unit of Measure
Items
Rolled Thread Hex Cap Screws

Hex Cap Screw, 1/4" Nominal Dia.
Rolled Thread Hex Cap Screws

Hex Cap Screw, 5/16" Nominal Dia.
Rolled Thread Hex Cap Screws

Hex Cap Screw, 3/8" Nominal Dia.
Rolled Thread Hex Cap Screws

Hex Cap Screw, 7/16" Nominal Dia.
Rolled Thread Hex Cap Screws

Hex Cap Screw, 1/2" Nominal Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Square and Hex Bolts and Screws
Codes and Standards N/A ASME B18.2.1 1996
Unit of Measure N/A English
Nominal Size or Basic Product Diameter 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 Product Diameter (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
Max. Body Diameter (E) 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
Min. Body Diameter (E) N/A 0.2450 in N/A 0.3065 in N/A 0.3690 in N/A 0.4305 in N/A 0.4930 in
Basic Width Across Flats (F) N/A 7/16 in N/A 1/2 in N/A 9/16 in N/A 5/8 in N/A 3/4 in
Max. Width Across Flats (F) N/A 0.438 in N/A 0.500 in N/A 0.562 in N/A 0.625 in N/A 0.750 in
Min. Width Across Flats (F) N/A 0.428 in N/A 0.489 in N/A 0.551 in N/A 0.612 in N/A 0.736 in
Max. Width Across Corners (G) N/A 0.505 in N/A 0.577 in N/A 0.650 in N/A 0.722 in N/A 0.866 in
Min. Width Across Corners (G) N/A 0.488 in N/A 0.557 in N/A 0.628 in N/A 0.698 in N/A 0.840 in
Basic Head Height (H) N/A 5/32 in N/A 13/64 in N/A 15/64 in N/A 9/32 in N/A 5/16 in
Max. Head Height (H) N/A 0.163 in N/A 0.211 in N/A 0.243 in N/A 0.291 in N/A 0.323 in
Min. Head Height (H) N/A 0.150 in N/A 0.195 in N/A 0.226 in N/A 0.272 in N/A 0.302 in
Min. Wrenching Height (J) N/A 0.106 in N/A 0.140 in N/A 0.160 in N/A 0.195 in N/A 0.215 in
Nom. LT for Screw Length (6 in. and Shorter) N/A 0.750 in N/A 0.875 in N/A 1.000 in N/A 1.125 in N/A 1.250 in
Nom. LT for Screw Length (Over 6 in.) N/A 1.000 in N/A 1.125 in N/A 1.250 in N/A 1.375 in N/A 1.500 in
Max. Transition Thread Length (Y) N/A 0.250 in N/A 0.278 in N/A 0.312 in N/A 0.3570 in N/A 0.385 in
Max. Circular Runout of Bearing Surface FIM N/A 0.010 in N/A 0.011 in N/A 0.012 in N/A 0.013 in N/A 0.014 in
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