• Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • The minimum radius is one half of the value shown.
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Unit of Measure
Items
Step Bolts

Step Bolt, with 0.199" Body Dia.
Step Bolts

Step Bolt, with 0.260" Body Dia.
Step Bolts

Step Bolt, with 0.324" Body Dia.
Step Bolts

Step Bolt, with 0.388" Body Dia.
Step Bolts

Step Bolt, with 0.452" 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 No. 10 N/A 1/4 in N/A 5/16 in N/A 3/8 in N/A 7/16 in
Nominal Size or Basic Bolt Dia. (Decimal) N/A 0.1900 in N/A 0.2500 in N/A 0.3125 in N/A 0.3750 in N/A 0.4375 in
Max. Body Dia. (E) N/A 0.199 in N/A 0.260 in N/A 0.324 in N/A 0.388 in N/A 0.452 in
Min. Body Dia. (E) N/A 0.182 in N/A 0.237 in N/A 0.298 in N/A 0.360 in N/A 0.421 in
Max. Head Dia. (A) N/A 0.656 in N/A 0.844 in N/A 1.031 in N/A 1.219 in N/A 1.406 in
Min. Head Dia. (A) N/A 0.625 in N/A 0.813 in N/A 1.000 in N/A 1.188 in N/A 1.375 in
Max. Head Height (H) N/A 0.114 in N/A 0.145 in N/A 0.176 in N/A 0.208 in N/A 0.239 in
Min. Head Height (H) N/A 0.094 in N/A 0.125 in N/A 0.156 in N/A 0.188 in N/A 0.219 in
Max. Square Width (O) N/A 0.199 in N/A 0.260 in N/A 0.324 in N/A 0.388 in N/A 0.452 in
Min. Square Width (O) N/A 0.185 in N/A 0.245 in N/A 0.307 in N/A 0.368 in N/A 0.431 in
Max. Square Depth (P) N/A 0.125 in N/A 0.156 in N/A 0.187 in N/A 0.219 in N/A 0.250 in
Min. Square Depth (P) N/A 0.094 in N/A 0.125 in N/A 0.156 in N/A 0.188 in N/A 0.219 in
Max. Corner Radius on Square (Q) N/A 0.031 in N/A 0.031 in N/A 0.031 in N/A 0.047 in N/A 0.047 in
Max. Fillet Radius (R) N/A 0.031 in
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