• Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • Flat on minimum diameter head calculated on minimum sharp and absolute minimum head diameters and 82 deg head angle.
  • Head shall be unslotted, unless otherwise specified. Slot dimensions are same as Slotted Flat Countersunk Head Cap Screws in American National Standard, ASME B18.6.2.
  • Maximum head height calculated on maximum sharp head diameter, basic bolt diameter and 78 deg head angle.
  • Minimum head height calculated on minimum sharp head diameter, basic bolt diameter and 82 deg head angle.
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Unit of Measure
Items
Countersunk Bolts

Countersunk Bolt and Slotted Countersunk Bolt, with 0.260" Body Dia.
Countersunk Bolts

Countersunk Bolt and Slotted Countersunk Bolt, with 0.324" Body Dia.
Countersunk Bolts

Countersunk Bolt and Slotted Countersunk Bolt, with 0.388" Body Dia.
Countersunk Bolts

Countersunk Bolt and Slotted Countersunk Bolt, with 0.452" Body Dia.
Countersunk Bolts

Countersunk Bolt and Slotted Countersunk Bolt, with 0.515" Body Dia.
Manufacturer N/A Industrial Fasteners Institute
Product N/A Round Head Bolts
Codes and Standards N/A ASME B18.5 1990 (R1998)
Unit of Measure N/A English
Nominal Size or Basic Bolt Dia. 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 Bolt Dia. (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 Dia. (E) N/A 0.260 in N/A 0.324 in N/A 0.388 in N/A 0.452 in N/A 0.515 in
Min. Body Dia. (E) N/A 0.237 in N/A 0.298 in N/A 0.360 in N/A 0.421 in N/A 0.483 in
Max. Edge Sharp Head Dia. (A) N/A 0.493 in N/A 0.618 in N/A 0.740 in N/A 0.803 in N/A 0.935 in
Min. Edge Sharp Head Dia. (A) N/A 0.477 in N/A 0.598 in N/A 0.715 in N/A 0.778 in N/A 0.905 in
Absolute Min. Edge Rounded or Flat Head Dia. (A) N/A 0.445 in N/A 0.558 in N/A 0.668 in N/A 0.726 in N/A 0.845 in
Max. Flat on Min. Dia. Head (F) N/A 0.018 in N/A 0.023 in N/A 0.027 in N/A 0.030 in N/A 0.035 in
Max. Head Height (H) N/A 0.150 in N/A 0.189 in N/A 0.225 in N/A 0.226 in N/A 0.269 in
Min. Head Height (H) N/A 0.131 in N/A 0.164 in N/A 0.196 in N/A 0.196 in N/A 0.233 in
Max. Slot Width (J) N/A 0.075 in N/A 0.084 in N/A 0.094 in N/A 0.094 in N/A 0.106 in
Min. Slot Width (J) N/A 0.064 in N/A 0.072 in N/A 0.081 in N/A 0.081 in N/A 0.091 in
Max. Slot Depth (T) N/A 0.068 in N/A 0.086 in N/A 0.103 in N/A 0.103 in N/A 0.103 in
Min. Slot Depth (T) N/A 0.045 in N/A 0.057 in N/A 0.068 in N/A 0.068 in N/A 0.068 in
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